Satellite Remote Sensing of Archaeological Vegetation Signatures in Coastal West Africa

This article discusses how archaeological sites in Sierra Leone, and by extension much of West Africa, can be identified through vegetation patterns (vegetation signatures) detectable in very high-resolution (VHR) multispectral satellite imagery. Settlement sites typically have a differing pattern of vegetation from the surrounding landscape, including concentrations of very large trees with sociocultural and historical significance: cotton (Ceiba pentandra) and baobab (Adansonia digitata). These features are conspicuous elements of the landscape both from the ground and in aerial imagery. Two complementary methods of using VHR multispectral satellite imagery are discussed in this paper: visual interpretation and semi-automated subpixel classification. These techniques are aiding ongoing archaeological survey of the Sierra Leone River Estuary. The impact of recently renewed industrial activity at a site of probable archaeological significance is also assessed through visually interpreted VHR satellite imagery.     

Remote Sensing and Archaeological Prospection in Apulia,Italy

Abstract

When deployed in combination with ground control, archaeological surface survey, and environmental research, remote sensing based upon high-resolution multispectral satellite imagery allows large areas to be evaluated efficiently by a small team of researchers and contributes to a better understanding of an archaeological landscape. In 2007 and 2008, we analyzed ca. 100 sq km of imagery centered on L'Amastuola, Italy. Combining the evaluation of high-resolution multispectral imagery with concurrent ground control led to the discovery of 29 sites and significant off-site scatters during about four weeks of fieldwork. Our analysis indicates that most of the detected features reflect geological conditions amenable to past human habitation rather than subsurface archaeological remains. Earlier fieldwork by the Murge Tableland Survey (MTS) provided independent definitions for various types of sites and a large sample of sites and off-site scatters in the study area. Comparison of our remote-sensing guided efforts with the results of that survey suggests that our success rate is too high to be explained by random association and also illuminates the strengths and weaknesses of the respective methods, underscoring the need to integrate satellite image analysis with ground control and surface survey.     

Editorial Introduction

Abstract

International response to the problem of looting of archaeological sites has been hampered by the difficulty of quantifying the damage done. The scarcity of reliable information negatively impacts professional and public policy making, rendering consensus about the scale of the problem and the effectiveness of policy responses difficult to achieve. We report here on the use of publicly-available satellite imagery for quantifying the damage caused by looting of archaeological sites in Jordan. The ease of use and affordability of imagery such as that provided by Google Earth make the identification, quantification, and monitoring of archaeological site looting possible at a level previously unimagined. Our findings about looting at archaeological sites in Jordan shed light on the potential for a broader application of the method.     

Monitoring Islamic Archaeological Landscapes in Ethiopia Using Open Source Satellite Imagery

The African landscape is set to change dramatically in the coming years, and will have a detrimental impact on the inherent archaeological and cultural heritage elements if not monitored adequately. This paper explores how satellite imagery, in particular open source imagery (Google Earth, multispectral satellite imagery from Landsat and Sentinel-2), can be utilized to monitor and protect sites that are already known with particular reference to Islamic archaeological sites in Ethiopia. The four sites used are in different geographic and geomorphological areas: three on the Somali Plateau (Harlaa, Harar, and Sheikh Hussein), and one on the edge of the Afar Depression (Nora), and have varied histories. The results indicate that open source satellite imagery offers a mechanism for evaluating site status and conservation over time at a large scale, and can be used on data from other areas of Africa by heritage professionals in the African continent at no cost.     

From conflict archaeology to archaeologies of conflict: remote survey in Kandahar,Afghanistan

ABSTRACT

Emerging from research with the Afghan Heritage Mapping Partnership, a multi-year project using satellite imagery to detect, record and manage archaeological heritage, this paper examines the potentials of remote-sensing to not only monitor archaeological material culture, but also contemporary materiality as it is violently (re)assembled through conflict. Through systematic remote-sensed archaeological survey using diachronic imagery in Kandahar, Afghanistan, this work expands archaeological understanding of an under-surveyed region while exploring the impact of the region’s expansive military infrastructural footprint on cultural heritage. Further, this research considers the long history of landscapes of control and successive military occupations. Remote survey allows for continued generation of archaeological data during conflict, thereby enabling more thorough heritage management. Finally, this survey demonstrates that, although remote aerial technologies have been criticized as tools of violence, surveillance and control, satellite imagery can be used analytically to generate new understandings of and challenges to military infrastructural reach.     

Corona Remotely-Sensed Imagery in Dryland Archaeology: The Islamic City of al-Raqqa,Syria

Abstract

Satellite remote sensing has seen some use in archaeological research, although its effectiveness has been restricted by the low spatial resolution and the high cost of available imagery. In 1995 the United States declassified 860,000 high-resolution Corona satellite photographs, acquired for intelligence purposes between 1960 and 1972. Corona offers global coverage with an emphasis on areas of strategic significance to the United States. The imagery has been released into the public domain at low cost of acquisition. In this paper we explore the potential of Corona imagery in archaeological investigations using as an example the topography and cultural landscape of the early Islamic city of al-Raqqa in northern Syria.     

Tracing Settlement Patterns and Channel Systems in Southern Mesopotamia Using Remote Sensing

Abstract

The integration of spatial datasets from historical satellite imagery, digital elevation models (DEMs), and past archaeological surveys provides new insights into the nature and remains of past landscape transformations. Using southern Mesopotamia as a case study, this article addresses, both quantitatively and qualitatively, long-held assumptions concerning the nature and relationship of settlement patterns and river channel systems in antiquity. GIS and image analysis are used to fill in gaps in the settlement record and propose a revised location for the Tigris River during most of antiquity. Given that only one-third of the central alluvial plain had been ground surveyed in southern Mesopotamia, how complete was our picture of landscape and settlement? How could gaps in settlement be interpreted? The present work in the area east of Baghdad suggests that archaeologists and historians have underestimated the nature and movements of the Tigris River. Satellite imagery can help reveal the location of the Tigris River prior to its settling into its modern course, shedding light on its potential role in the rise of early Mesopotamian agricultural societies. The work presented here proposes a methodology for unweaving and mapping preserved pieces of ancient landscapes, addressing larger issues of human modification of the landscape.     

Imaging Radar and Archaeological Survey: An Example from the Gobi Desert of Southern Mongolia

Abstract

The application of spaceborne imaging radar data to archaeological survey in arid regions was investigated at a study area in the Gobi Desert of southern Mongolia. A repertoire of computer enhancement regimens specific to archaeological applications was applied to RADARSAT imagery of the study area to reduce noise, detect lineaments, or otherwise enhance the data. The imagery was then georectified and integrated into a large area mosaic, creating detailed multi-layered image-maps that were used to direct ground exploration. During two field seasons with the Joint Mongolian-Russian-American Archaeological Expedition (JMRAAE) in 1997 and 1998, precise latitude/longitude information was obtained with Global Positioning Satellite (GPS) devices, establishing Ground Control Points with which to further georectify the image-maps. Both navigation and archaeological site selection were enhanced by hydrologic and topographic information in these satellite image-maps. The JMRAAE field team successfully located Palaeolithic cultural artifacts showing little or no surface expression, most often in association with ancient watercourses. The team was able to navigate accurately through the extreme desert terrain using the image-maps and GPS in this otherwise only minimally mapped area, thereby facilitating detailed archaeological reconnaissance and survey.     

Early Magdalenian Variability: New Evidence from El Mirón Cave,Cantabria, Spain

Abstract

Sediments in and in the area of archaeological sites provide an invaluable source of information on palaeoenvironments and past human activities. Examination of the composition, texture, and structure of sediments has been used successfully in many sites of different kinds to reconstruct palaeoclimates. Sediment analysis has also been used in recognizing activity areas and in interpreting the processes involved in the formation and destruction of archaeological sites. In addition, sediment analysis can be applied to elucidate the relationship between changes in subsistence-settlement systems and environmental change. The methods of sediment analysis in archaeology includes, in addition to the standard sedimentological methods, special microarchaeological analyses.     

Observatory validation of Neolithic tells (“Magoules”) in the Thessalian plain,central Greece,using hyperspectral spectroradiometric data

This paper presents the results obtained from field spectroradiometric campaigns over Neolithic tells (“magoules”) located at the Thessalian region in Greece. In each one of the four archaeological sites selected, three sections were carried out using the GER 1500 handheld spectroradiometer. Spectral profiles of the sections and several vegetation indices such as Normalized Difference Vegetation Indices (NDVI) and Simple Ratio (SR) have been examined in this study. This is one of the first times that ground hyperspectral data are evaluated in such context of archaeological research for the spectral characterization of archaeological features. As it was found, ground spectroradiometric measurements can be efficiently used in order to support and validate satellite imagery results for the detection of archaeological sites.     

On the Margins: Enduring Pre-Modern Water Management Strategies In and Around the Registan Desert,Afghanistan

The Registan Desert in southern Afghanistan has, like most deserts, traditionally been regarded as a barren, hostile space, devoid of human occupation other than occasional nomad campsites and an isolated 11th-century a.d. fortress. Detailed analysis of a strip of high resolution satellite imagery available through Google Earth and stretching into the Registan has revealed the presence of over 800 hitherto unrecorded archaeological sites. Many of these sites relate to water management, and predate the modern era. The water installations form networks of sites which facilitated the opportunistic exploitation of grazing following periodic rains, desert farming, travel, trade and exchange over hundreds of years, if not longer. Extrapolating from this detailed analysis, we argue that thousands of other sites have yet to be discovered in the Registan. These water management networks warrant further study in the field and protection from neglect, construction, recreational four-wheel driving, and looting.     

Seismic Refraction at Ancestral Puebloan Sites on the Pajarito Plateau,New Mexico

Abstract

Geophysical techniques can be used for non-invasive surveys at archaeological sites. One under-utilized technique, seismic refraction, has many potential applications. It is an inexpensive, efficient way to characterize subsurface deposits, especially at sites with shallow accumulations over bedrock. Archaeologists and geophysicists participating in the Summer of Applied Geophysics Experience from Los Alamos National Laboratory and Bandelier National Monument on the Pajarito Plateau in northern New Mexico characterized Ancestral Puebloan sites (A.D. 1200–1450) using this technique. We provide an overview of how seismic refraction works and demonstrate the applicability of seismic refraction for identifying buried archaeological features such as communal structures and walls.     

Detection of archaeological crop marks by using satellite QuickBird multispectral imagery

The capability of satellite QuickBird imagery for the identification of archaeological crop marks is herein presented and discussed for two test sites located in the South of Italy. The selected sites, dating back to Middle Ages, were buried under surfaces covered by herbaceous plants characterized by a different phenological status (dry/green) when the satellite data were acquired.     

Google earth and the archaeology of Saudi Arabia. A case study from the Jeddah area

Archaeologically, Saudi Arabia is one of the least explored parts of the Middle East. Now, thanks to Google Earth satellite imagery, a number of high-resolution ‘windows’ have been opened onto the landscape. Initial investigations already suggest large parts of the country are immensely rich in archaeological remains and most of those identified are certainly pre-Islamic and probably several thousand years old. Detailed interpretation of one ‘window’ east of Jeddah forms the basis for illustrating the richness of the heritage and how the satellite imagery can be exploited to shed important light on the character and development of the human landscape. Through this ‘window’ we set out a proposed methodology for future work and where it may lead.     

Archaeological Sites as Self-Sustained Resources for Economic Regeneration: Towards the Creation of Living Archaeological Parks on the Islands of Kythera and Antikythera

Abstract

This paper argues that less known archaeological sites on marginalized or non-touristic areas can contribute to the formation of local economies that can benefit from alternative heritage tourism and public participation in the archaeological excavation process. The discussion of a proposal for turning two archaeological sites on the Greek islands of Kythera and Anitkythera respectively (Paleokastro and Kastro) into living archaeological parks serves as an example that highlights the possibilities for the creation of self-sustainable heritage projects that need not rely on direct state funding.     

Protecting a ‘Homeric landscape’: The making of the Butrint National Park,Albania

Abstract

This paper will present research on the vulnerability mapping of coastal archaeological sites currently being undertaken in Northern Ireland. The ultimate aim of this research is improve current predictions of where archaeological sites and landscapes will be at risk in the future from coastal erosion. The initial stage of this approach uses a suite of oblique aerial photographs to construct a baseline of eroding locations and coastal geomorphology. The erosion baseline can then be integrated with existing historic environment records to obtain a coarse first-pass archaeological vulnerability assessment. Subsequent stages can then use this assessment to prioritize future mitigation such as field surveys or monitoring exercises, or conduct further refinements of vulnerability classifications by incorporating information on site type and positioning on a local scale.     

Thirty-Second Annual Meeting,Evesham, 1875

Abstract

This paper considers the sculpted capitals in Wells cathedral. Although integral to the early Gothic fabric, they have hitherto eluded close examination as either a component of the building or as an important cycle of ecclesiastical imagery in their own right. Consideration of the archaeological evidence suggests that the capitals were introduced mid-way through the building campaigns and were likely the products of the cathedral's masons rather than part of an original scheme for the cathedral as a whole. Possible sources for the images are considered. The distribution of the capitals in lay and clerical spaces of the cathedral leads to discussion of how the imagery might have been meaningful to different audiences on either side of the choir screen.     

Life and death at precolumbian Lavoutte,Saint Lucia,Lesser Antilles

Abstract

The Caribbean archaeological record requires immediate attention and protection. Development and natural forces have impacted archaeological sites, destroying or severely damaging them. The precolumbian site of Lavoutte, located in northern Saint Lucia, has been known as a major Late Ceramic Age (a.d. 1000–1500) settlement since the 1960s, but it has been damaged over the past decades by both natural and human processes. Multidisciplinary field and laboratory methodologies were implemented during a rescue project at the site from 2009 to 2010. This paper presents the results of collaborative efforts between local and international organizations. The first goal was to demonstrate the importance of protection and rescue of endangered archaeological sites. Secondly, we aimed to show that by adopting a multidisciplinary approach including artifact analysis, bioarchaeology, paleoenvironmental reconstruction, and geochemistry, severely damaged sites can be of significant informational value.     

Administration of parks with rack art: A symposium and workshop in Jujuy Argentina,December 2003

Abstract

Visits to archaeological sites, within school, a history or archaeology club, or a family group, are the main means for young people to engage with the archaeological historic environment. The majority of archaeological sites easily accessible for such groups are those that have been 'sanitized' for public consumption. These are often devoid of explanation of the archaeological process which made them accessible. This paper looks at the contribution that working archaeological sites can make to young people's understanding of archaeology, with particular reference to visits made by branches of the Young Archaeologists' Club, based in the UK.     

Methods for the extraction of archaeological features from very high-resolution Ikonos-2 remote sensing imagery,Hisar (southwest Turkey)

Archaeological research in the territory of Sagalassos is a multidisciplinary project covering scientific disciplines traditionally linked to archaeology and also new technologies such as very high-resolution remote sensing with sufficient radiometric and spatial resolution (<2.5 m). This paper focuses on the evaluation of GIS-, pixel- and object-based techniques for automatic extraction of archaeological features from Ikonos-2 satellite imagery, which are then compared to a visual interpretation of ancient structures. The study was carried out on the unexcavated archaeological site of Hisar (southwest Turkey). Although all techniques are able to detect archaeological structures from Ikonos-2 imagery, none of them succeed in extracting features in a unique spectral class. Various landscape elements, including archaeological remains, can be automatically classified when their spectral characteristics are different. However, major difficulties arise when extracting and classifying archaeological features such as wall remnants, which are composed of the same material as the surrounding substrate. Additionally, archaeological structures do not have unique shape or colour characteristics, which can make the extraction more straightforward. In contrast to automatic extraction methods, a simple visual interpretation performs rather well. The methods presented in this paper can be applied with variable success to archaeological structures composed of the same material as the surrounding substrate, which is often the case.