(PDF) Cityscapes without figures:geophysics, computing and the future of urban studies

Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali DISCI DIPARTIMENTO storia culture civiltà Archeologia Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali Collana DiSCi Il Dipartimento di Storia Culture Civiltà, attivo dal mese di ottobre 2012, si è costituito con l’aggregazione dei Diparti- menti di Archeologia, Storia Antica, Paleografia e Medievistica, Discipline Storiche Antropologiche e Geografiche e di parte del Dipartimento di Studi Linguistici e Orientali. In considerazione delle sue dimensioni e della sua complessità culturale il Dipartimento si è articolato in Sezioni allo scopo di comunicare con maggiore completezza ed efficacia le molte attività di ricerca e di didattica che si svolgono al suo interno. Le Sezioni sono: 1) Archeologia; 2) Geografia; 3) Medievistica; 4) Scienze del Moderno. Storia, Istituzioni, Pen- siero politico; 5) Storia antica; 6) Studi antropologici, orientali, storico-religiosi. Il Dipartimento ha inoltre deciso di procedere ad una riorganizzazione unitaria di tutta la sua editoria scientifica at- traverso l’istituzione di una Collana di Dipartimento per opere monografiche e volumi miscellanei, intesa come Collana unitaria nella numerazione e nella linea grafica, ma con la possibilità di una distinzione interna che attraverso il colore consenta di identificare con immediatezza le Sezioni. Nella nuova Collana del Dipartimento troveranno posto i lavori dei colleghi, ma anche e soprattutto i lavori dei più giovani che si spera possano vedere in questo strumento una concreta occasione di crescita e di maturazione scientifica. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali Looking to the Future, Caring for the Past Preventive Archaeology in Theory and Practice Proceedings of the 2013-2014 Erasmus IP Summer Schools in Preventive Archaeology: Evaluating sites and landscapes. Methods and techniques for evaluating the archaeological value Edited by Federica Boschi Bononia University Press Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali Bononia University Press Via Ugo Foscolo 7, 40123 Bologna tel. (+39) 051 232 882 fax (+39) 051 221 019 © 2016 Bononia University Press ISSN 2284-3523 ISBN 978-88-6923-173-5 www.buponline.com

I diritti di traduzione, di memorizzazione elettronica, di riproduzione e di adattamento totale o parziale, con qualsiasi mezzo (compresi i microfilm e le copie fotostatiche) sono riservati per tutti i Paesi. Cover: Aerial view over the Valley of the Cesano River (Marche, Italy). Cropmarks into the foreground and the Roman town of Suasa in the middle background (photo © Pierluigi Giorgi). Progetto grafico: Irene Sartini Impaginazione: DoppioClickArt - San Lazzaro (BO) Stampa: Press Up - Roma Prima edizione: dicembre 2016 Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali Table of Contents Preface VII Giuseppe Sassatelli Preface IX César Parcero-Oubiña Introduction 1 Section 1 “Preventive Archaeology”: the role of diagnostics Non-destructive field evaluation in Preventive Archaeology. Looking at the current situation in Europe 11 Federica Boschi Towards mapping the archaeological continuum. New perspectives and current limitations in Planning-Led-Archaeology in Italy 27 Stefano Campana Change is good: Adapting strategies for archaeological prospection in a rapidly changing technological world 41 James Bonsall, Chris Gaffney Preventive Archaeology in France and the contribution of extensive geophysics: from ARP® to web-GIS 59 Michel Dabas The shovel can wait. Good practice in archaeological diagnostics 69 Cristina Corsi Section 2 Cases of studies between research, teaching, management and prevention Reading ancient cities. The contribution of the non-invasive techniques 85 Federica Boschi City Archaeology in the Adriatic area: the cases of Burnum in Dalmatia and of Suasa and Ascoli in the Marche region 101 Enrico Giorgi An Urban Archaeology project in Senigallia 125 Giuseppe Lepore Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali Aerial survey in an Italian landscape: from archaeological site-detection and monitoring to prevention and management 135 Frank Vermeulen Less is more? A manifesto for targeted, problem-oriented research for Classical Archaeology students 147 Tesse D. Stek Aerial Archaeology and ancient landscapes. Combining traditional methods and advanced technologies. PRONAO (PROject New Atlas of Ancient Ostia): a case study 161 Giuseppe Ceraudo Preventive Archaeology and Geophysics in Near and Middle East: Past, present and perspectives 167 Christophe Benech Archaeological evaluation between research, landscape-management and prevention. A case study in Italy 181 Michele Silani, Federica Boschi Cityscapes without figures: Geophysics, computing and the future of urban studies 191 Chris Gaffney, Vince Gaffney, Wolfgang Neubauer, Eugene Ch’ng, Helen Goodchild, Phil Murgatroyd, Gareth Sears, Branko Kirigin, Ante Milosevič, Roger White Section 3 Methods and techniques An introduction to satellite remote sensing in archaeology: state of the art, methods, and applications 217 Giuseppe Scardozzi GPR surveys in Archaeology and additional interpretational methods 241 Mercedes Solla, Alexandre Novo, Henrique Lorenzo, Xavier Núñez-Nieto An evolution on GPR surveys of large archaeological sites 249 Alexandre Novo, Mercedes Solla, Henrique Lorenzo Strategies for using magnetic susceptibility to reconstruct ancient landscapes on a large scale: A case study from Persepolis (Central Fars, Iran) 257 Sébastien Gondet, Julien Thiesson Section 4 The Summer School on the field Studying an ancient settlement with non-invasive techniques. Integrated aerial and geophysical surveys at Civitalba (Marche) 275 Federica Boschi, James Bonsall, Roberto Carluccio, Gianluca Catanzariti, Michel Dabas, Darja Grosman, Giuseppe Lepore, Gianfranco Morelli, Iacopo Nicolosi, Ilaria Venanzoni The Authors 301 Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali Chris Gaffney CITYSCAPES WITHOUT FIGURES: Vince Gaffney GEOPHYSICS, COMPUTING AND Wolfgang Neubauer THE FUTURE OF URBAN STUDIES Eugene Ch’ng Helen Goodchild Phil Murgatroyd Gareth Sears Branko Kirigin Ante Milosevič Roger White The limits of archaeology The title of this paper refers, obliquely, to Robin Osborne’s (1987) influential book on the Greek city and its countryside Classical Landscape with Figures1. We start with this reference, in part because much of the content of this paper will refer to issues relating to the interpretation of archaeological land/cityscapes, but also because Osborne’s title contrasts the alluring figural representations often found on classical pottery with the frequent absence of people within the archaeological record itself. This may seem paradoxical to a reader who may be more familiar with exceptional urban finds, such as the human figures captured at death in the volcanic ash at Pompeii: and yet archaeologists, ulti- mately, depend on indirect or proxy evidence to recreate past societies and economies. For instance, it is readily apparent that much archaeological interpretation may be derived from the study of ceram- ics recovered from excavations: beyond simple technological statements the quality of ceramics may indicate status and the function of a vessel may suggest the economic role of a settlement. The source of such objects can also indicate social or trade networks, whilst decoration may even illustrate people and their actions. Yet, in the end, pots are not people and archaeology relies on a chain of theoretical speculation or experimental observation when it infers the nature of past societies from the artefacts that excavation uncovers. Of course, this should not suggest that archaeology is in any sense inferior in comparison with other disciplines. Indeed, on this basis archaeology might even be said to have some characteristics that may be compared to fundamental or exploratory science. In theoretical aspects of astrophysics, for example, the object of investigation may, or need, never be observed directly but instead can be inferred from a residue or a consequence of action. Instead archaeology should be appreciated as a ‘two cultures’ discipline. Its subject of study is humankind and their works but it relies, fundamentally, on science to provide much of its data. This includes absolute dating technologies to support chronology, paleoenvironmental sciences to recreate past economies and climate, and numeric sciences to synthe- 1 It should be noted that Osborne also appeared to borrow this title from an earlier travel book with this title and published in 1947 by British cartoonist, Sir Osbert Lancaster. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali 192 ˜ƒœ¶»»ÃºÎ«ƒœ¶»»ÃºÎ¬ƒ£ºÊ·¶ÊºÇšƒ˜½ĩüƒœÄŸ½¾Á¹¥ƒ¢ÊǼ¶ÉÇÄ遜ƒ¨º¶Çȁ—ƒ ¾Ç¾¼¾Ã–ƒ¢¾ÁÄȺ˾ű§ƒ¬½¾Éº sise the vast amounts of physical data generated by excavations or extensive landscape studies. Not sur- prisingly, computing has played an increasingly major role within the development of archaeological studies over the past twenty years or more and the development of, for example, the standing interna- tional conference on archaeological computing (http://caa-international.org/about/) exemplifies this process. Landscape archaeology and prospection Such processes have, perhaps, been most obvious in the development of landscape studies within ar- chaeology. Osborne’s 1987 book and contemporary publications, were responding to the large land- scape databases generated by a flurry of large archaeological field survey projects across the Mediter- ranean during the preceding decades2. It is hardly surprising that geographical information systems emerged as a key technology to assist in the process of understanding the mass of spatial information generated by such studies3. Great claims were made for these technologies and equally strong rebut- tals were delivered at various times – usually in reference to the rather naive theoretical context of the published studies and the relatively simplistic analyses applied4. Consequently, it remains true that computer-based archaeology retains a subaltern role within much archaeological debate. However, the last decade has seen step changes in the facility of pervasive technologies to explore rich archaeological contexts to the degree that, in some instances, the extent of emergent data, whilst not necessarily re- placing the lack of figures within a landscape, may have a positive formative value in theoretical terms5. One suspects that few other aspects of archaeological practise demonstrate this better than geo- physical prospecting and the study of the site6. With respect to ground-based geophysics, many of the early applications in archaeology were driven by the need to identify suitable areas for excava- tion within sites that were already known. The work was characterised by the relatively small scale of projects carried out and the relatively low value of such surveys, in larger interpretational terms, to archaeologists. There were fundamental reasons for such a situation and not least amongst these was the minimal expectation of archaeologists themselves for the technologies beyond the role of site investigation. It is also true that the instrumentation available was not actually conducive to large area surveys in terms of its capacity to record data or, perhaps, the design of the equipment itself7. Through to the beginning of the current century progress was largely determined by the rapid deve- lopment of more powerful instrumentation. Workstations developed exponentially in terms of proces- sor power, whilst field instruments acquired an enhanced capacity for data logging and processing in their own right. Restrictions on the acquired data and storage capacity can, to some extent, be equated with a potential increase in the physical scale of application, either in data resolution or spatial extent, and this has its own significance given the observations on the expanding theoretical aspirations of the archaeological community noted above. In some ways, the most exciting area of development as- sociated with geophysical prospection has been associated with processing and visualisation software (Neubauer 2001a). From the days when printed plots were physically pasted together for exami- nation, today’s specialist software provides a host of algorithms for processing, georeferencing and display of data as well as blending and fusing of multiple datasets (Fig. 1). In some senses a developmental peak occurred during the 1990s with a series of surveys dedicated to the exploration of Roman urban centres and some detailed commentary should be made on the nature of exploration within Roman cities and towns. It is significant that the authors of this paper have si- 2 E.g. Hitchner 1988, 1990; Alcock 1993; Sarris, Jones 2000. 3 Chapman 2006; Connoly, Lake 2006; Trinks et alii 2012; Neubauer 2004: Neubauer et alii 2012b. 4 Gaffney, van Leusen 1995. 5 Gaffney V. 2008 6 Gaffney et alii 1998; Gaffney C. 2008; Gaffney, Gater 2003. 7 Gaffney, Gaffney 2006. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali ˜¾ÉÎȸ¶ÅºÈ̾ɽÄÊÉIJ¼ÊǺȏœºÄŽÎȾ¸È¸ÄÂÅÊɾü¶Ã¹É½º»ÊÉÊǺĻÊÇ·¶ÃÈÉʹ¾ºÈ 193 Fig. 1. Typical flow chart for processing magnetometer data, LBI ArchPro 2011. gnificant experience of such sites. These early experiences were formative and the opportunity to work as part of teams excavating Roman towns preserved, essentially complete, provided an introduction to the archaeological complexity not of urban excavations but of research within specifically Roman, urban areas. This is a distinction that is deserving of some consideration as we would separate the issues Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali 194 ˜ƒœ¶»»ÃºÎ«ƒœ¶»»ÃºÎ¬ƒ£ºÊ·¶ÊºÇšƒ˜½ĩüƒœÄŸ½¾Á¹¥ƒ¢ÊǼ¶ÉÇÄ遜ƒ¨º¶Çȁ—ƒ ¾Ç¾¼¾Ã–ƒ¢¾ÁÄȺ˾ű§ƒ¬½¾Éº of deeply stratified archaeological sites within contemporary cities or major towns with those sites, for example Silchester in the United Kingdom or Carnuntum in Austria, which have been preserved almost in their entirety and are available, theoretically, for extensive investigation. Whilst certainly not denying the value of all sites to contribute to our knowledge of the process of urbanisation, settlements which provide relatively unfettered access demonstrate qualitative differences in terms of the nature of investigations that may be carried out and the research agendas that might be forwarded. These observations become important when one appreciates that the archaeological significance of cities across the area of Roman influence is not a simple phenomenon and that the questions one may ask of an urban centre may vary across the Roman world. The apparent, or presumed, unitary na- ture of Roman urban form has sometimes distracted from significant procedural variation associated with sites underlying contemporary cities as against the relatively smaller number of sites which have avoided major development. In the former group, a primary methodological requirement is to identify key strata within a mass of later development and to construct a larger interpretative position from a mosaic of detached datasets8. These sites have sometimes been viewed, in some sense, as superior to set- tlements that did not continue as urban centres or those that did not develop in a manner consistent with the expectations of Mediterranean archaeologists9. However, there is a growing appreciation that the latter group can now be seen to provide important information on the aspiration of local commu- nities in the past and their varying requirements from urban development and that this provides an alternative and substantial contribution to our knowledge of urban form derived from classical sources or Mediterranean type-sites10. It is suggested that the differences involved are of scale and resolution. Many, important, investiga- tions of major urban centres have provided a high-resolution snapshot of settlement development from the detailed excavation of relatively small and frequently dispersed development sites. The information provided, supported by the integration of serendipitous historic finds, may provide an excellent syn- thetic data source. The archaeology of London is an excellent example where the cumulative database now allows sophisticated historic analysis and one anticipates, given future commercial development of the historic core, that this can only get better.11 However, the opportunities provided through such work are rarely the product of a single research agenda and the restrictions of a database whose results are derived from non-archaeological decisions may only be resolved when ad hoc, random investiga- tions ultimately bear fruit. Many former urban areas, however, may always be beyond the reach of archaeologists and any restrictions in terms of key research agendas may never be adequately resolved. The opportunities provided when provided with access to an entire urban site are very different but face equally demanding interpretational challenges. There can be no doubt that such sites provide the opportunity for directed research, but the extent of the areas involved clearly pose problems in terms of traditional archaeological intervention. Whilst excavation will always be required to provide fine grained chronology and other supporting evidence, there is a knowledge/opportunity-cost in any de- cision to commit substantial resource to invasive research on these sites. If the decision to excavate is taken then it must clearly be on the basis of the best available evidence and here we must acknowledge that, in many areas of the empire, well preserved sites do not equate with well understood settlement practise and that, elsewhere, the urban form of the majority of such sites remains unknown. Of course, in the past there have been attempts to remedy such a situation using a range of traditional method- ologies. The investigation of Silchester is a case in point. Here the Society of Antiquaries carried out 8 Carver 1994. 9 Sears et alii 2012. 10 Lawrence et alii 2011. 11 The numbers of publications associated with the historic development of London are numerous and the publication output of the Museum of London demonstrates the range and quality of available data (http://www. museumoflondonarchaeology.org.uk/Publications/) Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali ˜¾ÉÎȸ¶ÅºÈ̾ɽÄÊÉIJ¼ÊǺȏœºÄŽÎȾ¸È¸ÄÂÅÊɾü¶Ã¹É½º»ÊÉÊǺĻÊÇ·¶ÃÈÉʹ¾ºÈ 195 extensive trenching to explore the city structure in the earlier 20th century12. Alternately, the aerial photographic study of Wroxeter, also in the United Kingdom, produced a plan of that site that prob- ably influenced a generation of archaeologists and their interpretation of Romano-British towns13. In both cases the limitations of these single methodologies was such that the results gave the impressions of relatively low density settlement, usually associated with elite, public or, at best commercial build- ing, surrounded by significant blank areas. These results inspired a generation of site reconstructions often characterised as ‘garden cities’ which were generally devoid of buildings not associated with gov- ernance, worship or the dwellings of the roman equivalent of the middle or upper class. The urban poor were apparently not always with us! Of course some settlements may well have been characterised by low density settlement. The work by the British School of Rome at Forum Novum in the Sabina has suggested that towns, even at the heart of empire, might only require certain buildings to carry out the legal functions of government14, and these settlements may not have needed a significant urban population to deliver such services. However, in the case of large, preserved towns in Roman Britain at least, there has always been the suspicion that such plans were incomplete. One of the significant challenges in urban studies has therefore been to provide mapped data from preserved towns that was both extensive and adequate for the purposes of the archaeological research questions asked. The opportunity for remote sensing to add substantively to the issues of Roman urban form have been recognised for more than two decades now and work, for instance on multiple sites in Italy by Keay and Millett, exemplify such trends15. Other projects, including that by the ZAMG Archeo Prospections team at Carnuntum in Austria provide longer term histories of prospection and explora- tion. Here a survey programme was initiated in 1991 and continued by the Ludwig Boltzmann In- stitute for Archaeological Prospection and Virtual Archaeology (LBI ArchPro) after 201016. Roman Carnuntum, the capital of the province of Pannonia, was situated at the river Danube east of Vienna17, large scale application of digital aerial archaeology, airborne remote sensing and ground based geo- physical prospection has provided substantive insights into the nature and structure of the city. Appli- cation of geophysical prospection in the 90s has been supported by a project involving the digitization and georeferencing of all available aerial images collected over seven decades in order to provide a map of the Roman cityscape and its hinterland18. This early example of the target-oriented combination of digital photogrammetry and GIS-based interpretative mapping added a multifaceted and compre- hensive data source to the traditional excavation records and find archives. Further GIS-based studies using this large dataset has generated novel analyses and developed our understanding of the urban layout of the Civil Town and the canabae legionis surrounding the main legionary fortress19. In detail, the combination of earth resistance survey, caesium magnetometry and ground penetrat- ing radar at Carnuntum had provided a high resolution geophysical data volume covering 1.2 km2 by 200120. The development of instrumentation21, new methods of data visualization including the animation of GPR depth slices, data fusion22 and GIS-based mapping and archaeological interpreta- tion23 further combined to make the work at Carnuntum an exemplar for integration for prospection 12 Boon 1974. 13 Wilson 1984. 14 Gaffney et alii 2004. 15 Keay et alii 2000. 16 Neubauer et alii 2012a, Doneus et alii 2001; Neubauer 1999. 17 Eder-Hinterleitner et alii 2003. 18 Doneus 2011; Doneus et alii 2001a; Doneus, Neubauer 2005. 19 Doneus et alii 2013. 20 Neubauer et alii 2012. 21 Neubauer et alii 2001; Neubauer et alii 1996. 22 Neubauer, Eder-Hinterleitner 1997. 23 Neubauer et alii 2002. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali 196 ˜ƒœ¶»»ÃºÎ«ƒœ¶»»ÃºÎ¬ƒ£ºÊ·¶ÊºÇšƒ˜½ĩüƒœÄŸ½¾Á¹¥ƒ¢ÊǼ¶ÉÇÄ遜ƒ¨º¶Çȁ—ƒ ¾Ç¾¼¾Ã–ƒ¢¾ÁÄȺ˾ű§ƒ¬½¾Éº Fig. 2. Image of the magnetic data of the Roman City of Wroxeter collected by GSB Prospection and the AMLaboratory of Eng- lish Heritage using Geoscan Re- search FM series magnetometers. methods24. The discovery of the civic forum of Carnuntum and its initial virtual reconstruction based on the geophysical data clearly showed the potential of integrated non-invasive prospection method- ologies25, and in 1998 a 3D GPR data set was analysed in detail to provide a 3D interpretation model of the buried remains26. Within Britain publication of the work at Roman Wroxeter also demonstrated this process at the end of the twentieth century at least (Figs. 2 and 3)27. A large number of people were involved in this project and teams from Britain, France, Germany the USA and Japan, private companies, governmental institu- tions and amateur groups all contributed to this large survey which, at the time, was among the largest ever attempted. The extent of the magnetometer survey and the consequences of the work in terms of known structures are apparent in Figure 2. The numbers of known structures increased by nearly 100% over the AP estimate at the beginning of the survey28, and although there are still gaps within the plan there is greater confidence now in how this might be interpreted in extensive terms (see Table 1). 24 Neubauer 2001b. 25 Neubauer 2014; Kandler 1999. 26 Neubauer et alii 1999. 27 Gaffney, Gaffney 2000; White et alii 2013. 28 Wilson 1984. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali ˜¾ÉÎȸ¶ÅºÈ̾ɽÄÊÉIJ¼ÊǺȏœºÄŽÎȾ¸È¸ÄÂÅÊɾü¶Ã¹É½º»ÊÉÊǺĻÊÇ·¶ÃÈÉʹ¾ºÈ 197 Table 1. Recorded structures from Wroxeter recorded from aerial pho- tography and geophysical survey. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali 198 ˜ƒœ¶»»ÃºÎ«ƒœ¶»»ÃºÎ¬ƒ£ºÊ·¶ÊºÇšƒ˜½ĩüƒœÄŸ½¾Á¹¥ƒ¢ÊǼ¶ÉÇÄ遜ƒ¨º¶Çȁ—ƒ ¾Ç¾¼¾Ã–ƒ¢¾ÁÄȺ˾ű§ƒ¬½¾Éº Fig. 3. Dominant wind direction and key functional areas in the north and west of the city. There are, however, other qualitative values to the survey at Wroxeter that remain to be developed. The published remote sensing data is essentially a traditional 2D map. However, the structure of the town derives substantially from its extensive terrain and, perhaps other less tangible attributes which require extensive data to interpret. It is clear, for instance, that the northern part of the town is associ- ated with the valley of the Rea Brook. The inclusion of this stream seems counter intuitive to a forti- fied settlement but the presence of large numbers of pits in this area suggests that the area is associated with tanning29, and its peculiar urban form has suggested that Wroxeter resembles, in many respects, a british hillfort as much as Roman city. However, the presence of a putative forum boarium in the northwest of the town and emerging evidence for lower class/artisanal settlement in the east suggests 29 Gaffney, Gaffney 2000 and White et alii 2013. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali ˜¾ÉÎȸ¶ÅºÈ̾ɽÄÊÉIJ¼ÊǺȏœºÄŽÎȾ¸È¸ÄÂÅÊɾü¶Ã¹É½º»ÊÉÊǺĻÊÇ·¶ÃÈÉʹ¾ºÈ 199 Fig. 4. Data capture at Wroxeter from the late 90s (a) and (b) as part of surveys by the Ludwig Boltzmann Institute for Archaeological Prospection and Virtual Archaeology. another guiding principle30. The dominant wind direction across the town is from the south west. This is reflected in the evidence for major fires adjacent to the forum being blown to the north east. This evidence suggests that the majority of the structure of the town may derive from a desire to restrict nauseous and potentially hazardous activities and the poor to areas downwind of the public and elite housing. In contrast to early reconstructions at Wroxeter the poor were very present but they had a designated place on the fringes of the city – and downwind from the rich. Despite the importance of surveys at the scale of Wroxeter in the UK or Carnuntum in Austria in the 1990s, less than a decade later they do not individually appear so significant in terms of the 30 Gaffney, Gaffney 2000. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali 200 ˜ƒœ¶»»ÃºÎ«ƒœ¶»»ÃºÎ¬ƒ£ºÊ·¶ÊºÇšƒ˜½ĩüƒœÄŸ½¾Á¹¥ƒ¢ÊǼ¶ÉÇÄ遜ƒ¨º¶Çȁ—ƒ ¾Ç¾¼¾Ã–ƒ¢¾ÁÄȺ˾ű§ƒ¬½¾Éº Fig. 5. The Foerster Ferex Magnetometer to the north of the Temple of Zeus, Cyrene. improved instrumentation now available. Instead it is the complexity of the datasets, and our capac- ity to integrate the data at the time of collection and within an increasingly innovative analytical and interpretative manner, that is the major opportunity and challenge. In particular, the general use of highly accurate positional devices has brought ground-based techniques to the foreground of land- scape prospection rather than site-based mapping. Low-grade positional devices have been used for a number of years with electromagnetic devices, and their value for mapping large-scale changes relating to underlying former land surfaces and palaeochannels is now coming to fruition. The integration of accurate GPS systems within suites of systems is now enhancing the role of ground-based geophysical prospecting in a manner that was previously unimaginable and the outputs of such projects are begin- ning to be appreciated through novel research collaborations including the pan-European consortium combining the authors’ institutions and the overarching Ludwig Boltzmann Institute for Archaeologi- cal Prospection and Virtual Archaeology (archpro.lbg.ac.at). The project equipment resource, avail- able to project partners, is characterized by mobility and close integration of GPS with multi-antenna GPR and multi-sensor magnetometer systems (Fig. 4). The speed at which the data is collected the LBI ArchPro collaborative is such that the cumulative data set acquired over two weeks of work at Stonehengeduring 2010 almost equates with the entire area covered by the Wroxeter survey over three years and multiple survey seasons of survey. More importantly, the density of data collection was such that the volume of data for the entire magnetometer survey at Wroxeter was probably exceeded at some point early during the first week of survey at the consortium’s project31. Although still requiring addi- tional processing the seamless nature of the primary data is apparent, whilst the density and positional accuracy of data provides a clarity of image, and confidence in interpretation, that had previously only been achieved by the exact, but frequently laborious and spatially limited, manual surveys of the past. We are beginning to see the fruits of the extension of these new prospection technologies in va- rious projects dedicated to the study of urban form. The use of multiple sensor technologies with 31 Gaffney et alii 2012. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali ˜¾ÉÎȸ¶ÅºÈ̾ɽÄÊÉIJ¼ÊǺȏœºÄŽÎȾ¸È¸ÄÂÅÊɾü¶Ã¹É½º»ÊÉÊǺĻÊÇ·¶ÃÈÉʹ¾ºÈ 201 Fig. 6. QuickBird satellite image of Cyrene showing magnetometry grids (QuickBird Satellite image © DigitalGlobe). GPS integration at Cyrene (Fig. 5)32, for instance, has begun to provide novel results even within cities in North Africa which are frequently presumed well understood as a consequence of the exten- sive structural remains; the surveyed areas shown on Figure 7 are the result of less than two weeks’ survey in 2007. The results from Area 5 (see Figs. 6-9), which encompasses two insulae immediately to the north of the agora and to the south and west of the central theatre, demonstrate this well33. Plans produced by previous excavations showed limited indications of walls in this insula: for exam- ple, Goodchild’s map of 1967 and Stucchi’s plan of 1975 shows the traces of the outside of walls apparently demarcating an insula. But the new work makes clear the extent of the structures and their importance in the study of the evolution and function of structures in Cyrene’s Upper Town in particular but also the city more generally34. The clear visualisation of walls in this survey area suggest buildings of considerable size which suggests an official or public character: its location and size (if one single construction) might denote a market complex, although we cannot exclude a substantial domestic residence or residences (domus)35. 32 Cuttler et alii 2007; Gaffney et alii 2008; Sears et alii 2012. 33 Sear 2006, p. 292. 34 White 1984, Fig. 1; Stucchi 1975, Figg. 5-8. 35 See Sears et alii 2012 for a detailed discussion on the relationship between the surveyed area, the rest of the town and movement through the surveyed area. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali 202 ˜ƒœ¶»»ÃºÎ«ƒœ¶»»ÃºÎ¬ƒ£ºÊ·¶ÊºÇšƒ˜½ĩüƒœÄŸ½¾Á¹¥ƒ¢ÊǼ¶ÉÇÄ遜ƒ¨º¶Çȁ—ƒ ¾Ç¾¼¾Ã–ƒ¢¾ÁÄȺ˾ű§ƒ¬½¾Éº Fig. 7. Plan of the Hellenistic to early Byzantine city of Cyrene (Sears et alii 2012, Fig. 7.1). The increased use of laser high definition survey technologies over the last decade is also of sig- nificance. These technologies, which occur as ground (HDS) or air-based (ALS or LiDAR) applica- tions36, may produce near continuous measurements of the surface of the ground or of archaeological structures. In respect of wider urban landscapes, the resolution of such data can approximate that of traditional ground-based remote sensing, and therefore provide important information on individual features i.e. below the scale of the site; the technology may lie in the intermediate position that 3D terrain data hold between the site and extensive remote sensing survey, aerial photographic or air or satellite sensor data. HDS Structural scanning, however, provides significant opportunities for Ro- man archaeologists studying those towns where substantial structures may exist above ground. Here, probably for the first time, urban archaeologists may be able to integrate structures and geophysical features in a true three dimensional volume and to use this to interpret the behavioural space of towns in a dramatic and novel manner. Some steps have been taken towards this by a team from Bradford and Birmingham in a survey of the mausoleum and ‘peristyle’ of Diocletian’s Palace in Split37. The Split project was designed to examine issues associated with the articulation of imperial space through an integrated research project that encompassed both 3D visualisation technologies and sub- 36 Challis 2006; English Heritage 2006a. 37 See Gaffney et alii 2012 for a more extensive examination of the work and results. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali ˜¾ÉÎȸ¶ÅºÈ̾ɽÄÊÉIJ¼ÊǺȏœºÄŽÎȾ¸È¸ÄÂÅÊɾü¶Ã¹É½º»ÊÉÊǺĻÊÇ·¶ÃÈÉʹ¾ºÈ 203 Fig. 8. Cyrene: Agora with surveyed areas (Sears et alii 2012, Fig. 7.7). surface exploration using ground penetrating radar. Diocletian’s Palace is the perfect complex for an investigation of the potential of integrated 3D modelling as a research and digital preservation tool. The considerable excavation and heritage management projects undertaken by several projects since the 1950s has provided a wealth of archaeological results that allows us to situate the current work in an increasingly understood (pseudo-)urban environment whilst the site is not so well understood that further archaeological exploration and visualisation would not have a considerable research impact. Additionally, Split, because of the extent of its standing structures, albeit embedded within later me- dieval buildings, and its extensive archaeological deposits, allows the production of an explorable 3D model that encompasses the results from remote sensing in order to answer questions about the com- plex and its built and buried environment. In the first season of work a large model of the mausoleum, and its environment were captured by a Leica HDS6000 3D laser scanner and a GPR survey was car- ried out in the peristyle in front of the mausoleum (and the main streets of the complex) using a Pulse EKKO Pro Ground Penetrating Radar system with a variety of antennas (100, 200 and 500 MHz). The two volumetric models produced by processing the laser-scan and GPR data were then integrated within the Avizo solid modelling package to create a single 3D model (see Fig. 10). The data from Split is now being used to test hypotheses of the use of the space of the peristyle between the mausoleum, the adjacent temple(s) and the entrance to the Vestibule and the former em- peror’s private apartments38. The geophysical data suggests that the original arrangements within the Peristyle may not be entirely matched in the current reconstruction and that further analysis might provide a different interpretation of the behavioural use of the structures and the, apparently empty space between. Given that the purpose of the palace was, in part, to assert the importance of Diocle- tian these and other immersive technologies clearly provide the opportunity to explore the ambience 38 See Gaffney et alii 2013; there is a considerable academic debate on whether ‘palace’ is an appropriate term for the complex and the function of the peristyle, see in particular: Swoboda 1961, p. 81; Duval 1961, 1971, 1991; Dyggve 1965; McNally 1989, pp. 9, 17-19, 34-35. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali 204 ˜ƒœ¶»»ÃºÎ«ƒœ¶»»ÃºÎ¬ƒ£ºÊ·¶ÊºÇšƒ˜½ĩüƒœÄŸ½¾Á¹¥ƒ¢ÊǼ¶ÉÇÄ遜ƒ¨º¶Çȁ—ƒ ¾Ç¾¼¾Ã–ƒ¢¾ÁÄȺ˾ű§ƒ¬½¾Éº Fig. 9. Top: laser scan model of the exterior of the mausoleum and peristyle overlying map of the modern city. Below: GPR data integrated within the larger volume model. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali ˜¾ÉÎȸ¶ÅºÈ̾ɽÄÊÉIJ¼ÊǺȏœºÄŽÎȾ¸È¸ÄÂÅÊɾü¶Ã¹É½º»ÊÉÊǺĻÊÇ·¶ÃÈÉʹ¾ºÈ 205 Fig. 10. A: high-definition GPR depth-slice (80 cm below surface) showing the foundations of a ludus. B: corresponding archaeological interpretation of all prospection data. C: MALÅ Imaging Radar Array. D: Virtual reconstruction of the ludus. of a site or structure and these novel, qualitative elements have largely been missing in the majority of published narratives. The value of such data is further illustrated in the recent discovery of a gladiatorial school at Car- nuntum and the range of virtual outputs derived from such work (carnuntum.7reasons.at). In 2011 a multidisciplinary team of archaeologists, geophysicists, soil scientists and IT experts led by the LBI ArchPro revealed the remains of a complete Roman school of gladiators (Fig. 5A), using a combina- tion of aerial photography, caesium magnetometry, multi-receiver electromagnetic induction meas- urements and high-definition ground penetrating radar39. The ludus gladiatorius was located outside the gates of the civil town to the west of the ruins of the 2nd century AD amphitheatre, which a con- temporary inscription suggests was the fourth largest in the Roman Empire40. The self-contained training and living quarters of the ludus cover approximately 2800 m2 located in a walled area of 11 000 m2 (Fig. 5B). A single, easily controlled entrance to the complex faced the am- phitheatre to the east. To the north, adjoining the school and within the walled compound, was an ex- tensive open campus, which most likely offered further practice areas and enclosures for wild animals. Inside the courtyard was a separate circular training arena with a diameter of 19 m and, at the centre, clear evidence of the palus (Fig. 5D), a wooden pole used for gladiatorial practise41. Around the closed 39 Saey et alii 2013. 40 Neubauer et alii 2014. 41 Futrell 2004; Meijer 2005. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali 206 ˜ƒœ¶»»ÃºÎ«ƒœ¶»»ÃºÎ¬ƒ£ºÊ·¶ÊºÇšƒ˜½ĩüƒœÄŸ½¾Á¹¥ƒ¢ÊǼ¶ÉÇÄ遜ƒ¨º¶Çȁ—ƒ ¾Ç¾¼¾Ã–ƒ¢¾ÁÄȺ˾ű§ƒ¬½¾Éº courtyard was a larger building complex including a 100 m2 heated training hall, an extensive bathing complex and an assembly hall. Additionally, the data also contains traces of the small cells provided for each gladiator, an administrative wing and housing for the school’s owner. The stairways suggest that the barracks of the school may have been two to three storeys high. Aside from these structural data the high resolution data revealed part of the public water and sewer network, hypocaust floor-heating systems, paths and gateways. The cemetery for the gladiators was also discovered near the School, clearly separated from other burial areas of the city. Although it is estimated that over one hundred ludi must have been built during the Roman pe- riod42, the Carnuntum ludus is an exceptional find and the only comparable structure is the partly excavated Ludus Magnus near the Coliseum in Rome – although that building is today only partly accessible today and fewer details have been preserved43. The discovery of the ludus at Carnuntum, and the media response to the project imagery, assisted in releasing funds for a larger research project aiming to map the entire cityscape of Carnuntum over an area of 10 km2. This has been achieved over three years by the LBI ArchPro (Fig. 5C) and the interpre- tative mapping is currently ongoing using novel GIS based visualisation and fusion toolboxes as well as a systematic approach towards a standardized classification of the mapped structures. The resulting detailed archaeological maps and plans of individual buildings, streets and Roman infrastructure per- mit the virtual reconstruction of the city layout and development of the ancient land- and cityscapes in three and even four dimensions. The output will ultimately provide scholars, planning authorities and the public alike with detailed information about the city. Finally, the non-invasive and sustain- able approach to archaeological survey of Roman city sites is exemplary for time- and cost-efficient archaeology, integrating site as well as surrounding landscape, in a manner in full compliance with in- ternational standards set by agreements including the Valetta Convention (Council of Europe 1992). An important point follows from this observation. The significance of these new technologies is not simply their power, but the application of the continuous measurement and analysis of space and the extension of the analytical sphere to virtually every part of an urban landscape. The resulting three dimensional datasets of archaeological sites and their surrounding landscapes demand adequate in- tegrated archaeological interpretation and the development of novel concepts of dynamic analysis, including temporal relations and attributes. Therefore, a remaining challenge is the transformation of the acquired data into information that is accurate, readable and ready for future use. An integrated, easy-to-use multi-purpose toolbox, with a common graphical interface, supporting prospection ex- perts as well as period or regional specialists may also require easy-to-use tools for dynamic visualiza- tion and integrated archaeological interpretation, data archiving, information retrieval and long-term maintenance. However, powerful as these technologies are, the description of space is not interpretation, and infinitely finessing the resolution of data cannot satisfy our disciplinary aspirations to explain the past. The physical environment itself is a quantifiable research asset that requires incorporation within wider interpretative schema. Historically, there is little doubt that landscapes (urban or rural) were imbued with meaning to past societies and, even today, we frequently study our physical and natural context in its own right and appreciate the ability of landscapes to manipulate human action as a consequence merely of its existence. In this context, physical scale can become a driving force in its own right, and an emergent goal, possibly the ultimate goal in computational archaeology and large scale archaeologi- cal prospection specifically, is the approximation of the individual, or being, in the world, within these extensive, interpreted, digital environments. 42 Meijer 2005. 43 Colini, Cozza 1962. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali ˜¾ÉÎȸ¶ÅºÈ̾ɽÄÊÉIJ¼ÊǺȏœºÄŽÎȾ¸È¸ÄÂÅÊɾü¶Ã¹É½º»ÊÉÊǺĻÊÇ·¶ÃÈÉʹ¾ºÈ 207 Fig. 11. MWGRID architecture. Figures in a landscape? It is no surprise, therefore, that Agent-Based Modelling (ABM) has recently emerged as an area of in- terest for historical disciplines as a means to explore the effect of individual action within reconstruct- ed environments. Applications, to date, have been relatively limited and examples include the analysis of resource exploitation by Native American groups of South West Colorado44, and the process of evolution of complex societies in the Fertile Crescent45. It is notable, that most recent studies have generally involved the analysis of small-scale groups at individual or household level rather than larger societies but the availability of large, even exascale, computing may change the capacity of technology to answer archaeological problems relating to the actions of individuals. An example of such work carried out at Birmingham is the “Medieval Warfare on the GRID” (MWGrid) project46. The project builds on a series of parallel research developments in Birmingham and Princeton relating to the analysis of medieval military logistics and the development of novel computational infrastructure designed to investigate complex systems (Fig. 11). The project seeks to capture and analyse behavioural action at a larger scale, involving tens of thousands of agents within the context of modelling logistical arrangements relating to the battle of Manzikert (AD 1071), a key event in Byzantine history in which the Imperial army was defeated by the Seljuk Turks. The Byzantine army has been marched through a digital representation of various sections of the Asia Minor terrain to study the effects that the environment, resource availability and decision making have on the well- being of a large military force. The representation of the Asia Minor terrain is developed using a unique set of data including multi-spectral satellite mosaics, vegetation maps, geology maps, elevation models and historical maps incorporating detailed topography, route and demographic data. Considering how important the outcome of the battle was to the Byzantine Empire, the Seljuk Turks and the modern republic of Turkey, the historical sources leave several significant gaps. Histori- 44 Varien et alii 2007; Kohler et alii 2008. 45 Wilkinson et alii 2013. 46 Gaffney et alii 2013. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali 208 ˜ƒœ¶»»ÃºÎ«ƒœ¶»»ÃºÎ¬ƒ£ºÊ·¶ÊºÇšƒ˜½ĩüƒœÄŸ½¾Á¹¥ƒ¢ÊǼ¶ÉÇÄ遜ƒ¨º¶Çȁ—ƒ ¾Ç¾¼¾Ã–ƒ¢¾ÁÄȺ˾ű§ƒ¬½¾Éº Fig. 12. Constituent parts of modelling “Doggerland”. cal sources are vague, contradictory or absent for such factors as how many people were in the Byzan- tine army or which route it took. Byzantine writers do not give numbers for the size of the Byzantine army, their foreign contemporaries give figures between 300,000 and 600,00047 but these are largely motivated by a desire to emphasize the scale of the Byzantine defeat. Modern historians tend to put the 47 Hillenbrand 2007, pp. 27-36. Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali ˜¾ÉÎȸ¶ÅºÈ̾ɽÄÊÉIJ¼ÊǺȏœºÄŽÎȾ¸È¸ÄÂÅÊɾü¶Ã¹É½º»ÊÉÊǺĻÊÇ·¶ÃÈÉʹ¾ºÈ 209 figure at between 40-70,000 men48 but there is a need to introduce new types of evidence into a debate where all currently available data sources have been analysed. The MWGrid project centres on agents representing all the members of the army. The commander, through to the lowliest servant, occupy part of a military structure with one clear goal; to arrive at a destination in a fit state to win a battle. They act as part of a hierarchical organisation but have a certain amount of autonomous decision making capability and travel through an environment that contains a variety of resources required to complete their journey. Multiple executions of the agent-based model are required with different numbers of people and animals, different levels of food availability and dif- ferent types of organisation and route planning. The simulation will record both the state and progress of the army as well as the effects on the communities impacted by the progress of the army. An army of between 40-70,000 people with attendant horses and pack animals requires over 100,000 agents in order to be modelled on a 1:1 basis. Clearly the processing power and the memory requirements needed for a simulation of the whole 6-month campaign at a high temporal resolution far exceed the capabilities of any conventional machines. Distributed simulation and the harnessing of distributed computing resources can be used to run models that will not effectively run on a single computer49 but ensuring that the complexity of the model is appropriate to the question being posed can reduce the re- sources needed to simulate a system. For this reason, a number of smaller targeted models were created. The need to model and visualise resources for ancient landscapes have further prompted stud- ies using concepts from Complexity and Artificial Life sciences that take into account diverse in- teractions and adaptability to biotic and abiotic factors. This technique mimics nature’s emergent phenomenon – global patterns emerge from the local interactions of simple rules embedded within agents. The application of the model on a small terrain as part of the North Sea Palaeolandscapes Project has been visualised using games engines (Fig. 12). This pilot study testing agents as virtual humans, explores survival and settlement behaviours based on resources and the environment (e.g. proximity to water). Agents have reasoning capability and memories that fade with the passing of time, identify object ownerships and family or strangers via tagging. With recent funding through an ERC Advanced Grant, this pilot study will be developed further and across a larger digital terrain perhaps integrating more sophisticated behaviour as well as hunting behaviours.50 The provision of a visually sophisticated front end to the analyses presented here may appear frivo- lous to many computer scientists, or even archaeologists, but there are issues that demand this level of additionality for Arts disciplines – and urban archaeologists stand to benefit significantly from such analyses. The vastly complex outputs of the projects at Carnuntum, Wroxeter or Silchester lend themselves to sophisticated visualisation and analysis. This is required, in part, to provide an accessible output for human observers but the concept of visualisation as an investigative tool in its own right is also becoming central to the perceived value of these technologies. We can explore this in respect of, for instance, Diocletian’s Palace. Such palaces are extremely rare but the interpretative issues are common to many archaeological landscapes. The cityscape is a four-di- mensional puzzle in which spatial relations of monuments (in Cartesian terms) must be merged with archaeological and personal time (measured by the scale and spatial relationship of structures) and interpretational significance is situated both in the past through the, presumed, liturgical and social significance of the spaces to urban societies, and the present, where our personal appreciation of the surviving landscape or situation of a monument must also be gauged and represented. The archaeologi- 48 E.g. Haldon 2008, p. 172; Norwich 1991, p. 346. 49 E.g. Wittek, Rubio-Campillo 2012. 50 The ERC Advanced Grant Project entitled “Europe’s Lost Frontiers: exploring climate change, settlement and colonisation of the submerged landscapes of the North Sea basin using ancient DNA seismic mapping and complex systems modelling”, began in December 2015 and will last 5 years, http://www.bradford.ac.uk/life-sciences/arch-sci/lost- frontiers/ Pdf concesso da Bononia University Press all'autore per l'espletamento delle procedure concorsuali 210 ˜ƒœ¶»»ÃºÎ«ƒœ¶»»ÃºÎ¬ƒ£ºÊ·¶ÊºÇšƒ˜½ĩüƒœÄŸ½¾Á¹¥ƒ¢ÊǼ¶ÉÇÄ遜ƒ¨º¶Çȁ—ƒ ¾Ç¾¼¾Ã–ƒ¢¾ÁÄȺ˾ű§ƒ¬½¾Éº cal problems of the Urbs, like any other landscape, are therefore quantitative, semi-quantitative and qualitative in nature. To represent this in any sense is a challenge but any solution will certainly require substantive digital assistance which goes beyond simple measurement, Serious Gaming based on the digital outputs described above provides one route for development and will generate environments where the user experiences an enhanced sensuousness of perception and approximations of time/space movement that can merge archaeometrics with ideational models. Like many other quantitative mod- els there is no claim that such a reconstruction is ‘real’ in any sense. They are merely a representation of our interpretation, which may itself have an emotional impact upon the observer. However, there is an argument that this is a better representation of how archaeologists actually relate to their subject of study and as represented by much academic publication. In reality this tends to be more emotive than the abstract mapping within traditional articles suggests. At a time when our interpretations of Roman cities are becoming ever more sophisticated we must acknowledge that when archaeologists imagine the squalor of a Roman town they do not think in terms of greyscales or finely drawn plans but of people, places and smell and, ultimately, the majority of the figures in any landscape, or cityscape were the poor. Viriconium Cornoviorum may have been a pleasant place to live if you were a member of the elite households but even they could not have avoided the smell of tanning, the distress of cattle being slaughtered and, perhaps, the smell of the lumpen proletariat in their workshops when the wind was in the wrong direction. Finding a way to integrate these observations and to communicate them is the challenge of urban studies in the future. 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