Radar Mapping, Archeology, and Ancient Maya Land Use

Adams, Richard E.; Brown, W. E.; Culbert, T. Patrick

doi:10.1126/science.213.4515.1457

Cited by 114 publications

(68 citation statements)

References 7 publications

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“…From an historical perspective, the earliest use of SAR to study paleo-landscapes dates back to the 1980s with 32 investigations in both tropical and subtropical territories (Adams et al, 1981) and arid environments (Elachi et GHz, 3.75-7.5 cm; X 8-12.5 GHz, 2.5-3.75 cm, and proving that better performance is usually obtained at longer 37 Archaeologists can also benefit from the full range of beam modes and incidence angles offered by the same 120 satellite mission to improve the detection and delineation of subtle archaeological features, whilst relating them 121 to the landscape over a wide swath. Figure 3 demonstrates the stunning improvement in SAR imaging from 122 ScanSAR to High Resolution Spotlight modes to discriminate the UNESCO World Heritage List Nasca Lines,123 in Southern Peru.…”

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confidence: 99%

Trends and perspectives of space-borne SAR remote sensing for archaeological landscape and cultural heritage applications

Tapete

Cigna

2017

Journal of Archaeological Science: Reports

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4This paper provides an overview of the opportunities that image analysts, archaeologists and conservation 5 scientists currently have of using space-borne Synthetic Aperture Radar (SAR) imagery for prospection of 6 cultural landscapes and investigation of environmental, land surface and anthropogenic processes that can alter 7 the condition of heritage assets. The benefits of the recent developments in SAR satellite sensors towards higher 8 resolution (up to less than 1 metre) and shorter revisiting times (up to a few days) are discussed in relation to 9 established techniques using the two key SAR parameters -amplitude and phase. Selected case studies from 10 Middle East to South America illustrate how SAR can be effectively used to detect subtle archaeological 11 features in modern landscapes, monitor historic sites and assess damage in areas of conflict. These examples 12 form the basis to highlight the current trends in archaeological remote sensing based on space-borne SAR data 13 in the current era of the European Space Agency's Sentinel-1 constellation and on-demand high resolution space 14 missions. 15

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Trends and perspectives of space-borne SAR remote sensing for archaeological landscape and cultural heritage applications

Tapete

Cigna

2017

Journal of Archaeological Science: Reports

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“…The SARbased imaging potential to investigate surface and shallow subsurface structures has been noticed after Shuttle Imaging Radar (SIR) A to C imagery was successfully used to map geomorphic features over less vegetated topography (McHone et al 2002). There has been a substantial amount of research work exploiting geometrical properties of surfaces including slope and roughness estimates using patterns and contrasts in SAR image tone and texture (e.g., Abdelsalam et al 2000;Adams et al 1981;Blom et al 1984;Berlin et al 1986;Grandjean et al 2001;Paillou et al 2006a, b). In particular, the potential of the low frequency domain (1-2 GHz) of L-band spaceborne SAR, when compared to applications of shorter wavelengths of C, S and X band SAR, is obvious for the purpose of subsurface mapping.…”

Section: Methods and Data Processingmentioning

confidence: 99%

The Oasis impact structure, Libya: geological characteristics from ALOS PALSAR-2 data interpretation

Gasselt

Kim

Choi

et al. 2017

Earth Planets Space

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Optical and infrared remote sensing may provide first-order clues for the identification of potential impact structures on the Earth. Despite the free availability of at least optical image data at highest resolution, research has shown that remote sensing analysis always remains inconclusive and extensive groundwork is needed for the confirmation of the impact origin of such structures. Commonly, optical image data and digital terrain models have been employed mainly for such remote sensing studies of impact structures. With the advent of imaging radar data, a few excursions have been made to also employ radar datasets. Despite its long use, capabilities of imaging radar for studying surface and subsurface structures have not been exploited quantitatively when applied for the identification and description of such features due to the inherent complexity of backscatter processes. In this work, we make use of higher-level derived radar datasets in order to gain clearer qualitative insights that help to describe and identify potential impact structures. We make use of high-resolution data products from the ALOS PALSAR-1 and ALOS PALSAR-2 L-band sensors to describe the heavily eroded Oasis impact structure located in the Libyan Desert. While amplitude radar data with single polarization have usually been utilized to accompany the suite of remote sensing datasets when interpreting impact structures in the past, we conclude that the integration of amplitude data with HH/HV/HH-HV polarization modes in standard and, in particular, in Ultra-Fine mode, as well as entropy-alpha decomposition data, significantly helps to identify and discriminate surface units based on their consolidation. Based on the overarching structural pattern, we determined the diameter of the eroded Oasis structure at 15.6 ± 0.5 km.

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“…Their use has proven valuable for as diverse applications as the mapping of the surface of Venus by the Magellan and Venera missions (Arvidson, Schulte, Kwok, Curlander, Elachi, Ford & Saunders 1988), the unearthing of lost Maya ruins (Adams, Brown & Culbert 1981), and the 4D (space and time) monitoring of the environment (Moreira, Prats-Iraola, Younis, Krieger, Hajnsek & Papathanassiou 2013).…”

Section: Application To Sar Datamentioning

confidence: 99%

Visualization of Skewed Data

Ospina¹,

Larangeiras²,

Frery³

2014

Rev. colomb. estad.

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After discussing the main characteristics of the histogram and of a number of variations in the boxplot, this work presents a visualization tool specifically tailored to deal with skewed data. The idea is to use various types of boxplots (the classical one, which is tuned for skewness of the data, the shifting boxplot, and the box-percentile plot), the violin plot, and the histogram with a nonparametric estimate of the density overlay. The plots are presented in such a way that they facilitate the extraction of additional information from each one. We show that a good deal of information can be extracted from the inspection of the output using example data from synthetic aperture radar images. We provide an implementation in R based on functions already available.Key words: Exploratory Data Analysis, Skewed Data, Boxplot, Violin Plot, Visualization. ResumenDespués de discutir las principales características del histograma y de un número de variables en el boxplot, se presento una herramienta de visualisación específicamente diseñada para el tratamiento de datos. La idea es usar varios tipos de boxplots (el clásico, el cual es adaptado para la consideración de sesgo de los datos, el boxplot trasladado, y el gráfico de cajas de percentiles), el gráfico violin, y el histograma con un estimador no paramétrico de la densidad. Los gráficos son presentados de forma que faciliten la extracción de información adicional. Se muestra como una buena cantidad a Professor. E-mail: rayospina@gmail.com b MSc Candidate. E-mail: amlarangeiras@gmail.com c Professor. E-mail: acfrery@gmail.com 400Raydonal Ospina, Antonio Marcos Larangeiras & Alejandro C. Frery de información que puede ser extraída a través de ejemplos de imágenes de radar de apertura sintética. Se presenta su implementacón en R basada en funciones actualmente disponibles.Palabras clave: análisis exploratorio de datos,boxplot, datos sesgados grá-ficos de violin, visualización.

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Radar Mapping, Archeology, and Ancient Maya Land Use

Cited by 114 publications

References 7 publications

Trends and perspectives of space-borne SAR remote sensing for archaeological landscape and cultural heritage applications

Trends and perspectives of space-borne SAR remote sensing for archaeological landscape and cultural heritage applications

The Oasis impact structure, Libya: geological characteristics from ALOS PALSAR-2 data interpretation

Visualization of Skewed Data

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