Whose Data Is It Anyway? Lessons in Data Management and Sharing from Resurrecting and Repurposing Lidar Data for Archaeology Research in Honduras

As a response to Hurricane Mitch and the resulting widespread loss of life and destruction of Honduran infrastructure in 1998, the United States Geological Survey (USGS) conducted the first wide-area airborne lidar topographic mapping project in Central America. The survey was executed by the Bureau of Economic Geology at the University of Texas at Austin (BEG) in 2000, and it was intended to cover 240 square kilometers distributed among 15 flood-prone communities throughout Honduras. The original data processing produced basic digital elevation models at 1.5-meter grid spacing which were used as inputs for hydrological modeling. The USGS published the results in a series of technical reports in 2002. The authors became interested in this dataset in 2013 while searching for geospatial data that would provide additional context and comparative references for an archaeological lidar project conducted in 2012 in the Honduran Mosquitia. After multiple requests to representatives from the USGS and BEG, we found various types of processed data in personal and institutional archives, culminating in the identification of 8-mm magnetic tapes that contained the original point clouds. Point clouds for the 15 communities plus a test area centered on the Maya site of Copán were recovered from the tapes (16 areas totaling 700 km2). These point clouds have been reprocessed by the authors using contemporary software and methods into higher resolution and fidelity products. Within these new products, we have identified and mapped multiple archaeological sites in proximity to modern cities, many of which are not part of the official Honduran site registry. Besides improving our understanding of ancient Honduras, our experiences dealing with issues of data management and access, ethics, and international collaboration have been informative. This paper summarizes our experiences in the hope that they will contribute to the discussion and development of best practices for handling geospatial datasets of archaeological value

Viewed from above: extracting the built environment from the ancient Purépecha site of Angamuco through development of a new methodology

2019 Fall.Includes bibliographical references.This thesis utilizes commonly used GIS tools to develop a methodology capable of extracting the built environment from the complex topology of the ancient Purépecha site of Angamuco located in Michoacán, Mexico. Unlike lowland areas and coastal regions Angamuco sits upon a volcanic malpaís consisting of rolling hills, small valleys, complex ridgelines, and a multitude of microtopographic features creating a complex physical landscape. This topographically complex landscape creates unique challenges in extracting subtle archaeological features and requires a new methodology to separate the built environment. This new methodology utilizing common GIS tools in a flexible workflow consisting of topographic manipulation, value identification, and analysis preparation. The results of the methodology provides a data set of 87,407 possible archaeological features. These features are all greater than 5m² in area and consist of a wide range of circular to rectilinear, linear, and numerous miscellaneous shaped features throughout the site. The capability of this dataset in further analysis is shown through the application of a density analysis and classification based on the Thinness Ratio to conduct OBIA at the individual feature level. Although, the dataset does require manual clean-up the application of the data to answer certain questions about the urban attributes of the site of Angamuco is valid. Further analysis of this output dataset through GIS can provide detailed answers to questions about urban design for the Purépecha prior to and during the early Empire phase

Ethics in Archaeological Lidar

Airborne laser scanning or lidar has now been used by archaeologists for twenty years, with many of the first applications relying on data acquired by public agencies seeking to establish baseline elevation maps, mainly in Europe and North America. More recently, several wide-area acquisitions have been designed and commissioned by archaeologists, the most extensive of which cover tropical forest environments in the Americas and Southeast Asia. In these regions, the ability of lidar to map microtopographic relief and reveal anthropogenic traces on the Earth’s surface, even beneath dense vegetation, has been welcomed by many as a transformational breakthrough in our field of research. Nevertheless, applications of the method have attracted a measure of criticism and controversy, and the impact and significance of lidar are still debated. Now that wide-area, high-density laser scanning is becoming a standard part of many archaeologists’ toolkits, it is an opportune moment to reflect on its position in contemporary archaeological practice and to move towards a code of ethics that is vital for scientific research. The papers in this Special Collection draw on experiences with using lidar in archaeological research programs, not only to highlight the new insights that derive from it but also to cast a critical eye on past practices and to assess what challenges and opportunities remain for developing codes of ethics. Using examples from a range of countries and environments, contributions revolve around three key themes: data management and access; the role of stakeholders; and public education. We draw on our collective experiences to propose a range of improvements in how we collect, use, and share lidar data, and we argue that as lidar acquisitions mature we are well positioned to produce ethical, impactful, and reproducible research using the technique

Identifying Ancient Settlement Patterns through LiDAR in the Mosquitia Region of Honduras

The Mosquitia ecosystem of Honduras occupies the fulcrum between the American continents and as such constitutes a critical region for understanding past patterns of socio-political development and interaction. Heavy vegetation, rugged topography, and remoteness have limited scientific investigation. This paper presents prehistoric patterns of settlement and landuse for a critical valley within the Mosquitia derived from airborne LiDAR scanning and field investigation. We show that (i) though today the valley is a wilderness it was densely inhabited in the past; (ii) that this population was organized into a three-tiered system composed of 19 settlements dominated by a city; and, (iii) that this occupation was embedded within a human engineered landscape. We also add to a growing body of literature that demonstrates the utility of LiDAR as means for rapid cultural assessments in undocumented regions for analysis and conservation. Our ultimate hope is for our work to promote protections to safeguard the unique and critically endangered Mosquitia ecosystem and other similar areas in need of preservation

The Mausoleum Architectural Project: Reinterpreting Palenque's temple of the inscriptions through 3D data-driven architectural analysis

The Temple of the Inscriptions at Palenque, Mexico, is an outstanding example of Classic Maya architecture erected in the seventh century as the funerary building for ruler K'inich Janab Pakal. For decades, scholars have speculated on its construction sequence and the potential existence of hidden rooms on either side of Pakal's mortuary chamber. This article aims to advance understanding of the Temple's architectural context in light of new 3D data. After reviewing the application of drone-based photogrammetry and terrestrial Light Detection and Ranging in the Maya area, we argue that these techniques are capable of enhancing the architectural analysis of the Temple of the Inscriptions and showing that this structure was part of a larger architectural project, encompassing the adjacent Temple XIII, and the connecting stepped building platform. Our findings demonstrate that the basal platforms for the Temple of the Inscriptions and Temple XIII were erected contemporaneously and that the design of their mortuary chambers follows a tripartite layout we identified in Palenque's elite funerary architecture and associated mortuary practices. We conclude that these three buildings were part of a mausoleum architectural project, the construction of which was initiated by Pakal to reshape Palenque's site-core and enshrine the ruling family's power and ancestors

Space, Settlement, and Environment: Detecting Undocumented Maya Archaeological Sites with Remotely Sensed Data

This study utilizes an integrated remote sensing approach to augment settlement pattern research in the Yalahau Region of northern Quintana Roo, Mexico. The region has a long history of human occupation and an environment ranging from coasts, freshwater wetlands, forests, to fields and towns all above a porous karst geology. By utilizing various sensors (LiDAR, GeoEye and Landsat) and collection methods (satellite, aerial) as well as post-processing (band combinations, component analyses and indices) and cross-referencing the data, it is possible to generate a signature, which strongly correlates with evidence of prehistoric occupation. Field verification of a selection of identified signatures was conducted to assess the presence of human cultural material. The results of this investigation are presented together with other regional settlement pattern data in order to assess the status of a number of methodological and archaeological questions and supplement other regional data already available

Developing an interoperable cloud-based visualization workflow for 3D archaeological heritage data. The Palenque 3D Archaeological Atlas

In archaeology, 3D data has become ubiquitous, as researchers routinely capture high resolution photogrammetry and LiDAR models and engage in laborious 3D analysis and reconstruction projects at every scale: artifacts, buildings, and entire sites. The raw data and processed 3D models are rarely shared as their computational dependencies leave them unusable by other scholars. In this paper we outline a novel approach for cloud-based collaboration, visualization, analysis, contextualization, and archiving of multi-modal giga-resolution archaeological heritage 3D data. The Palenque 3D Archaeological Atlas builds on an open source WebGL systems that efficiently interlink, merge, present, and contextualize the Big Data collected at the ancient Maya city of Palenque, Mexico, allowing researchers and stakeholders to visualize, access, share, measure, compare, annotate, and repurpose massive complex archaeological datasets from their web-browsers

Executable Map Paper (EMaP) for Archaeological LiDAR

Archaeological LiDAR has evolved into an indispensable component of archaeological prospection and landscape archaeology. However, it is frequently employed as a black-box digital method, which confines it to the realm of a specialized field. Making scientific publications more accessible, transparent, and reproducible is one of the steps required to turn LiDAR into a background method for all archaeologists. This is possible, according to our proposal, through the Executable Map Paper concept. This concept can be understood as a type of executable paper that pursues Open Science’s goals. The proposed technical solution consists of a PDF frontend, a persistence layer, and a hyperlinked interactive map. Executable Map Paper is applicable to all map-dependent sciences, including geography, geology, and any geoscience. In this paper, we outline the theoretical context, propose technical solutions, and provide a practical illustration

Earthen Monuments and Social Movements in Eastern North America: Adena-Hopewell Enclosures on Kentucky’s Bluegrass Landscape

Geometric earthen enclosures are some of the best known pre-Columbian monuments in North America. Across the Eastern Woodlands, many have been preserved as state and national parks. However, their chronological placement is poorly understood as they relate to the rise of complex social behaviors associated with the Adena-Hopewell florescence (500 BC–AD 500) in the Middle Ohio Valley. This is especially true for communities who built smaller enclosures referred to by archaeologists as ‘scared circles’. To better understand the timing, tempo, and nature of their construction I examined the Bluegrass Region in Central Kentucky using aerial and terrestrial remote sensing methods to learn if more enclosures were built than previously known. My results indicate the remnants of many sites exist but have been greatly damaged by modern agricultural activities and development. I then excavated a series of seven sites, examining their embankments, ditches, and internal use-areas. I found the communities who built these monuments did so in ways unique to their local histories of participation in the Adena-Hopewell social movement. Chronological modeling suggests the construction of all earthen enclosures in the Bluegrass region likely occurred in 170 years or less and the spread came from the north, possibly Central Ohio. Burial mounds, however, were built as early as 400 BC and the switch to building enclosures signals a major social change in the need for ritual space. From the sum of these results I argue that the traditional definition of Adena is indeed earlier than the major Hopewell climax in Ohio. However, I argue that this may indicate the material evidence for Hopewell ritual cycles, of which local populations in Kentucky were likely active participants in, do not represent a separate culture but instead a different context and situation for interregional integration