scholarly journals Photogrammetric Measurement of Erosion at the Sabbath Point Beothuk Site in Central Newfoundland, Canada

2020 ◽  
Vol 12 (18) ◽  
pp. 7555
Author(s):  
James Williamson ◽  
Ionut Cristi Nicu
Keyword(s):  
Low Cost ◽  
Digital Elevation Models ◽  
Archaeological Site ◽  
River Valley ◽  
Archaeological Sites ◽  
Archaeological Research ◽  
Grass Gis ◽  
Digital Elevation ◽  
Photogrammetric Measurement

Erosion at archaeological sites in Central Newfoundland, Canada is a major concern, which is compounded by the fact that there has been a dearth of archaeological research in this region. While more than 70 house pits are known, very few excavations have examined whole features in the Exploits River Valley (ERV), and the archaeology of many has not been examined yet. The aim of this study is to examine the rate of erosion at the Sabbath Point house pit, a recently recorded archaeological site, located on the bank of Red Indian Lake (RIL), and to describe a low-cost methodology for analysing site level bank changes. This site is particularly important, as it represents an example of a late Beothuk residential feature about lifeways practiced in this region. The surveys employed here were carried out using image-based modelling. GRASS GIS was used to measure the diachronic difference between bank edges. The Digital Elevation Models (DEMs) were then compared, and the differences were measured using a transect based method. The erosion measurement has shown that Sabbath Point is in danger of being completely eroded. This shows that a salvage excavation program covering the entire feature is necessary within the next few years, as the feature itself will begin to erode.

The archaeological site of chellah, new technologies for investigation, modeling, and mapping.

2021 ◽  
Author(s):  
Iman el guertet ◽  
Abdellatif aarab ◽  
Abdelkader larabi ◽  
Mohammed Jemmal ◽  
Sabah benchekroun
Keyword(s):  
New Technologies ◽  
Low Cost ◽  
Archaeological Site ◽  
Archaeological Sites ◽  
Electrical Tomography ◽  
Geophysical Investigation ◽  
Islamic Period ◽  
Non Invasive ◽  
Aerial Vehicle ◽  
Modern Technologies

<p>archaeological sites have been always a subject of curiosity and search, the archaeologists and scientists from different specialties have been wondering about the origins of the man civilization, about the way our forefathers lived, how they nourished, dressed, and housed themselves, what techniques were used for the transport, the fishing, and the business, about the culture and the spiritual practices. in fact, the modern technologies, practices, and innovations are only a continuation of what was once; this is why the human being believes it is imperative to revive and understand the heritage and to discover its secrets. in the present work which pours in the same direction, we decided to revive and explore a wealthy site located in rabat, the Moroccan capital, this site is named chellah, which represents the summing up of historical eras from the antiquity to the Islamic period and which is marked by the presence of antique and Islamic constructions which reflect this continuity. our research aims to build a model for the detection of areas that are not yet excavated but are already mentioned by archaeologists, geographers, and historians to validate their hypothesis and to find out where exactly these areas are located. our methodology is based on the processing of unmanned aerial vehicle<strong> (uav)</strong> images to generate high-resolution photogrammetric products with low cost, those datasets will be analyzed with a technique that has been in use since the '80s and which is using crop, soil, and shadow marks visualized on images taken by aerial photography. this analysis gave us the vision to select the zones on which a geophysical investigation by electrical tomography was carried out to approve the presence of the archeological components that require future excavation. our study focused on the importance of non-invasive methodologies for the study, preservation, and valorization of archaeological sites.</p>

scholarly journals A low-cost autonomous rover for polar science

2019 ◽  
Author(s):  
Andrew O. Hoffman ◽  
Hans Christian Steen-Larsen ◽  
Knut Christianson ◽  
Christine Hvidberg
Keyword(s):  
Modular Design ◽  
Low Cost ◽  
Digital Elevation Models ◽  
Ice Core ◽  
Snow Accumulation ◽  
Spatiotemporal Variability ◽  
Dual Frequency ◽  
Ice Stream ◽  
Digital Elevation ◽  
Software Instrumentation

Abstract. We present the developmental considerations, design, and deployment of an autonomous modular terrestrial rover for ice-sheet exploration that is inexpensive, easy to construct, and allows for instrumentation customization. Total construction cost for this rover is less than $3000, approximately one tenth the cost of existing platforms, and it can be built using facilities frequently available at academic institutions (machine shop, 3D printer, open-source hardware and software). Instrumentation deployed on this rover can be customized; the rover presented in this study was equipped with a dual-frequency GPS receiver and a digital SLR camera for constructing digital elevation models using structure-from motion (SfM) photogrammetry. We deployed this prototype rover on the Northeast Greenland Ice Stream to map local variations in snow accumulation and surface topography. The rover conducted four autonomous missions based out of the East Greenland Ice Core Project (EGRIP) camp during July 2017, measuring surface elevation transects across the hazardous ice-stream shear margins. During these missions, the rover proved capable of driving over 20 km on a single charge with a drawbar pull of 25°N, sufficient to tow commercial ground-penetrating radars. The rover also acquired photographs that were subsequently used to construct digital elevation models of a site monitored for spatiotemporal variability in snow accumulation, demonstrating adequate stability for high-resolution imaging applications. Due to its low cost, low-power requirements, and simple modular design, mass deployments of this rover design are practicable. Furthermore, operation of the rover in hazardous areas circumvents substantial expense and risk to personnel associated with conventional, crewed deployments. Thus, this rover is an investigatory platform that enables direct exploration of polar environments considered too hazardous for conventional field expeditions.

scholarly journals Construction of Digital Elevation Models for a Southern European City and a Comparative Morphological Analysis with Respect to Northern European and North American Cities

2010 ◽  
Vol 49 (7) ◽  
pp. 1377-1396 ◽  
Author(s):  
Silvana Di Sabatino ◽  
Laura S. Leo ◽  
Rosella Cataldo ◽  
Carlo Ratti ◽  
Rex E. Britter
Keyword(s):  
North American ◽  
Low Cost ◽  
Digital Elevation Models ◽  
Urban Canopy ◽  
European City ◽  
Dispersion Models ◽  
Northern European ◽  
Digital Elevation ◽  
Urban Flow ◽  
American Cities

Abstract A morphometric analysis of a southern European city and the derivation of relevant fluid dynamical parameters for use in urban flow and dispersion models are explained in this paper. Calculated parameters are compared with building statistics that have already been computed for parts of three northern European and two North American cities. The aim of this comparison is to identify similarities and differences between several building configurations and city types, such as building packing density, compact versus sprawling neighborhoods, regular versus irregular street orientation, etc. A novel aspect of this work is the derivation and use of digital elevation models (DEMs) for parts of a southern European city. Another novel aspect is the DEMs’ construction methodology, which is low cost, low tech, and of simple implementation. Several building morphological parameters are calculated from the urban DEMs using image processing techniques. The correctness and robustness of these techniques have been verified through a series of sensitivity tests performed on both idealized building configurations, as well as on real case DEMs, which were derived using the methodology here. In addition, the planar and frontal area indices were calculated as a function of elevation. It is argued that those indices, estimated for neighborhoods of real cities, may be used instead of the detailed building geometry within urban canopy models as those indices together synthesize the geometric features of a city. The direct application of these results will facilitate the development of fast urban flow and dispersion models.

scholarly journals A Low-Cost, Easy-Way Workflow for Multi-Scale Archaeological Features Detection Combining LiDAR and Aerial Orthophotography

2021 ◽  
Vol 13 (21) ◽  
pp. 4270
Author(s):  
Antonio J. Ortiz-Villarejo ◽  
Luís-M. Gutiérrez Soler
Keyword(s):  
Low Cost ◽  
Archaeological Site ◽  
Basic Knowledge ◽  
Archaeological Sites ◽  
Multi Scale ◽  
Internal Structures ◽  
Insurmountable Obstacle ◽  
A Site ◽  
High Degree ◽  
The Town

The difficulty of obtaining funding often places the continuity of research projects at risk, forcing researchers to resort to low-cost methodologies. Such methodologies sometimes require a high degree of technical knowledge which, in many cases, poses an insurmountable obstacle to the development of a project. This article shows a low-cost, easy-way methodology for diachronically analysing terrain in search of archaeological evidence on different scales (micro and semi-micro) in both already known and new archaeological sites through the analysis of orthophotographs taken with UAVs, the DEMs generated from them, and public LiDAR data. It allows researchers with small budgets but with a basic knowledge of GIS and photogrammetry to undertake some aspects of their project without necessarily having to call on the assistance or support of specialists. Thanks to this methodology, the researcher will be able to continue until they are able to obtain the funding that will enable them to take their research further, with specialists. This article presents the first conclusions obtained after applying the proposed methodology at the Giribaile (Vilches, Spain) archaeological site—a site of interest in its territory which possibly functioned as an advance defensive post for the town, a hypothesis based on the towers and numerous internal structures that have been identified.

scholarly journals A method based on structure-from-motion photogrammetry to generate sub-millimetre-resolution digital elevation models for investigating rock breakdown features

2019 ◽  
Vol 7 (1) ◽  
pp. 45-66 ◽  
Author(s):  
Ankit Kumar Verma ◽  
Mary Carol Bourke
Keyword(s):  
High Resolution ◽  
Structure From Motion ◽  
Low Cost ◽  
Digital Elevation Models ◽  
Point Clouds ◽  
Experimental Conditions ◽  
Weathered Rock ◽  
Topographic Data ◽  
Digital Elevation ◽  
Dense Point

Abstract. We have generated sub-millimetre-resolution DEMs of weathered rock surfaces using SfM photogrammetry techniques. We apply a close-range method based on structure-from-motion (SfM) photogrammetry in the field and use it to generate high-resolution topographic data for weathered boulders and bedrock. The method was pilot tested on extensively weathered Triassic Moenkopi sandstone outcrops near Meteor Crater in Arizona. Images were taken in the field using a consumer-grade DSLR camera and were processed in commercially available software to build dense point clouds. The point clouds were registered to a local 3-D coordinate system (x, y, z), which was developed using a specially designed triangle-coded control target and then exported as digital elevation models (DEMs). The accuracy of the DEMs was validated under controlled experimental conditions. A number of checkpoints were used to calculate errors. We also evaluated the effects of image and camera parameters on the accuracy of our DEMs. We report a horizontal error of 0.5 mm and vertical error of 0.3 mm in our experiments. Our approach provides a low-cost method for obtaining very high-resolution topographic data on weathered rock surfaces (area < 10 m2). The results from our case study confirm the efficacy of the method at this scale and show that the data acquisition equipment is sufficiently robust and portable. This is particularly important for field conditions in remote locations or steep terrain where portable and efficient methods are required.

scholarly journals Creating Low-Cost High-Resolution Digital Elevation Models

2003 ◽  
Vol 56 (1) ◽  
pp. 92 ◽  
Author(s):  
M. Louhaichi ◽  
M. M. Borman ◽  
A. L. Johnson ◽  
D. E. Johnson
Keyword(s):  
High Resolution ◽  
Low Cost ◽  
Digital Elevation Models ◽  
Digital Elevation

scholarly journals Creating low-cost high-resolution digital elevation models.

2006 ◽  
Vol 56 (1) ◽  
Author(s):  
M. Louhaichi ◽  
M.M. Borman ◽  
A.L. Johnson ◽  
D.E. Johnson
Keyword(s):  
High Resolution ◽  
Low Cost ◽  
Digital Elevation Models ◽  
Digital Elevation

The 2010 Cumberland River Survey Emergency Survey and Archaic Shell Site Composition in the Western Middle Cumberland River Valley

2019 ◽  
pp. 42-55
Author(s):  
Tanya M. Peres ◽  
Aaron Deter-Wolf
Keyword(s):  
Archaeological Site ◽  
Early Morning ◽  
River Valley ◽  
Archaeological Sites ◽  
New Information ◽  
Significant Damage ◽  
History Of ◽  
Cumberland River ◽  
Site Disturbance ◽  
Molluscan Species

Over three days beginning in the early morning of May 1, 2010, heavy storms caused severe flooding and riverbank erosion along portions of the Cumberland River throughout Middle Tennessee. That event caused significant damage to numerous prehistoric archaeological sites, and resulted in substantial looting of newlyuncovered site deposits and subsequent shoreline assessments of 128 previously recorded prehistoric sites along 67.5 river miles of the Cumberland River between Cheatham and Old Hickory Dams, as well as sampling of selected, highly endangered deposits. As a result of the emergency river survey, investigators were able to collect significant new data regarding the composition of nine shell-bearing Archaic sites along the Cumberland River in the western Middle Cumberland River Valley of Tennessee. Those include new information regarding site composition and the collection of radiocarbon samples. This chapter describes the history of archaeological site disturbance in the region and summarizes the findings of the post-flood survey as they relate to molluscan species composition of Archaic shell-bearing sites in the region.

scholarly journals The Methodological Aspects of Constructing a High-Resolution DEM of Large Territories Using Low-Cost UAVs on the Example of the Sarycum Aeolian Complex, Dagestan, Russia

Drones ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 7
Author(s):  
Artur Gafurov
Keyword(s):  
High Resolution ◽  
Unmanned Aerial Vehicles ◽  
Nature Reserve ◽  
Low Cost ◽  
Digital Elevation Models ◽  
Ultrahigh Resolution ◽  
Aerial Vehicles ◽  
Digital Elevation ◽  
Methodological Aspects ◽  
First Time

Unmanned aerial vehicles (UAV) have long been well established as a reliable way to construct highly accurate, up-to-date digital elevation models (DEM). However, the territories which were modeled by the results of UAV surveys can be characterized as very local. This paper presents the results of surveying the Sarycum area of the Dagestan Nature Reserve of Russia with an area of 15 sq. km using a DJI Phantom 4 UAV, as well as the methodological recommendations for conducting work on such a large territory. As a result of this work, a DEM with 0.5 m resolution as well as an ultrahigh resolution orthophotoplane were obtained for the first time for this territory, which make it possible to assess the dynamics of aeolian processes at a qualitatively different level.

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