scholarly journals Textured digital elevation model formation from low-cost UAV LADAR/digital image data

2015 ◽  
Author(s):  
Taylor C. Bybee ◽  
Scott E. Budge
Keyword(s):  
Digital Elevation Model ◽  
Digital Image ◽  
Low Cost ◽  
Image Data ◽  
Digital Elevation ◽  
Elevation Model ◽  
Model Formation

Lowlands Mapping in Forest Guinea

2013 ◽  
Vol 4 (1) ◽  
pp. 20-34 ◽  
Author(s):  
S. Saïdi ◽  
A. Camara ◽  
L. Gazull ◽  
M. Passouant ◽  
M. Soumaré
Keyword(s):  
Surface Topography ◽  
Digital Elevation Model ◽  
Low Cost ◽  
Mapping Method ◽  
Drainage Network ◽  
Digital Elevation ◽  
Agricultural Potential ◽  
Forested Areas ◽  
Main Index ◽  
Elevation Model

This article presents a lowland mapping method for the Forested Guinea (Guinée Forestière) using a 30 m resolution Digital Elevation Model (DEM) that is currently the best option to analyze large forested areas. This low cost DEM method applies surface topography analysis processes to better discriminate areas with stagnant and/or accumulated water. The main index selected is the immediate proximity of flat areas to drainage network, the former with slope gradients not exceeding 5% (2.86°). The mapped lowlands potential cover a surface of 4516 km2, i.e., 10% of the total area of the region with hydro-agricultural potential.

scholarly journals Accuracy of the TanDEM-X Digital Elevation Model for Coastal Geomorphological Studies in Patagonia (South Argentina)

2019 ◽  
Vol 11 (15) ◽  
pp. 1767 ◽  
Author(s):  
Francesca Pasquetti ◽  
Monica Bini ◽  
Andrea Ciampalini
Keyword(s):  
Digital Elevation Model ◽  
Spatial Resolution ◽  
Mean Squared Error ◽  
Low Cost ◽  
High Agreement ◽  
Squared Error ◽  
Digital Elevation ◽  
Vertical Error ◽  
Global Coverage ◽  
Elevation Model

The aim of this paper is to evaluate the usefulness of TanDEM-X DEM (digital elevation model) for remote geomorphological analysis in Argentinian Patagonia. The use of a DEM with appropriate resolution and coverage might be very helpful and advantageous in vast and hardly accessible areas. TanDEM-X DEM could represent an unprecedented opportunity to identify geomorphological features because of its global coverage, ~12 m spatial resolution and low cost. In this regard, we assessed the vertical accuracy of TanDEM-X DEM through comparison with Differential Global Positioning System (DGPS) datasets collected in two areas of the Patagonia Region during a field survey; we then investigated different types of landforms by creating the elevation profiles. The comparison indicates a high agreement between TanDEM-X DEM and reference values, with a mean absolute vertical error (MAE) of 0.53 m, and a root mean squared error (RMSE) of 0.73 m. The results of landform analysis show an appropriate spatial resolution to detect different features such as beach ridges, which are impossible to delineate with other lower resolution DEMs. For these reasons, TanDEM-X DEM constitutes a useful tool for detailed geomorphological analyses in Argentinian Patagonia.

Use of low-cost UAV photogrammetry to analyze the accuracy of a digital elevation model in a case study

Measurement ◽  
2016 ◽  
Vol 91 ◽  
pp. 276-287 ◽  
Author(s):  
B. Kršák ◽  
P. Blišťan ◽  
A. Pauliková ◽  
P. Puškárová ◽  
Ľ. Kovanič ◽  
...  
Keyword(s):  
Digital Elevation Model ◽  
Low Cost ◽  
Digital Elevation ◽  
Elevation Model

scholarly journals Extração de Obstruções Perspectivas de Edifícios ao Longo de Vias Urbanas

2006 ◽  
Vol 33 (2) ◽  
pp. 101
Author(s):  
ANTONIO JULIANO FAZAN ◽  
ALUIR PORFÍRIO DAL POZ ◽  
EDINÉIA APARECIDA DOS SANTOS GALVANIN
Keyword(s):  
High Resolution ◽  
Digital Elevation Model ◽  
Digital Image ◽  
Aerial Images ◽  
Perspective Projection ◽  
Object Space ◽  
Digital Elevation ◽  
Intensity Image ◽  
Elevation Model

This paper presents an approach for extraction of perspective obstructions in high-resolution aerial images caused by the perspective projection of buildings onto adjacent urban ways. The proposed methodology consists in firstly extracting the contours of building roofs and urban ways from an intensity image generated by a conversion of a Digital Elevation Model (DEM). In the following, the polygons representing the roof contours are projected through the perspective bundle onto the respective mean planes of adjacent ways. Intersections between polygons representing roof contours and local segments of adjacent ways allow the extraction of the perspective obstructions in the object-space. The perspective obstruction polygons are finally projected onto the digital image basically using the collinearity equations. The results obtained by methodology allow the verification of its performance and show its potential for extraction of perspective obstructions in high-resolution aerial images.

UAV-based digital image processing applied to the fossiliferous tanks prospection: insights at Guanambi region, northeast Brazil

2020 ◽  
Author(s):  
José Magalhães ◽  
Gessica Pereira ◽  
Alexsander Leão ◽  
Carolina Scherer
Keyword(s):  
Image Processing ◽  
High Resolution ◽  
Digital Image Processing ◽  
Digital Image ◽  
Low Cost ◽  
Smartphone Application ◽  
3D Models ◽  
Rock Outcrops ◽  
Digital Elevation ◽  
Elevation Model

<p>This study reveals the use of high resolution images collected by small Unmanned Aerial Vehicle (UAV) and Digital Image Processing (DIP) from Structure from Motion (SfM) technique applied to the prospection and geometric characterization of fossil tanks in the Guanambi region, located at Bahia state, Brazil. Geologically, the region is located in the Guanambi Batolith, composed of granites, migmatites and orthognaisses. In the research region for example, there was the Lagoa das Abelhas fossiliferous tank, which was previously excavated and in which bone fragments of various pleistocene mammal taxa, such as those of the order Xenarthra, were found, represented by sloths, glyptodonts and armadillos. Considering that there are no records of an effective scientific method to identify these features, the main objective of this work is to map the distribution of fossiliferous tanks excavated as well as those with prospective potential, and to estimate the geometries that they present through the use of the high resolution DIP. The Phantom 4 Advanced equipped with RGB 1’’ CMOS effective 20 M sensor were the UAV model type and camera used for conducting the flight plan. The Pix4D Capture was the tablet/smartphone application used for conducting the flight operation and image collection in an area with ​​80 ha. After this step, the images were submitted as DIP routines using the SfM technique from the Agisoft Metashape software, version 1.5.1. The DIP is divided into stages like point cloud calculation, 3D models generation from mesh and texture procedures, digital elevation model (DEM) and orthomosaic. With the integration of images (DEM and orthomosaic) it was possible to identify and delineate a total of 14 targets through geometric information such as surface area, length, width, depth and internal format. The configuration in relation to soil type, vegetation and rock outcrops was the same around the Lagoa das Abelhas fossil tank. After that, the team came back to fieldwork and found fossil fragments of three out of fourteen targets. Thus, this study could show the potential of using UAV to cover large areas directed to the prospecting part of fossiliferous tanks with good flight autonomy, low cost and fast data analysis. Some of the 11 targets can be prospected because they have a high prospective potential due to their similarity to past prospects which became sites for future paleontological prospection.</p>

LANDSLIDE MONITORING USING CLOSE RANGE PHOTOGRAMMETRY

2021 ◽  
Vol 19 ◽  
Author(s):  
Munirah Radin Mohd Mokhtar ◽  
Suriani Ngah Abdul Wahab ◽  
Mohd Najib Husain ◽  
Haslina Hashim ◽  
Asmma’ Che Kasim
Keyword(s):  
Digital Elevation Model ◽  
Low Cost ◽  
Digital Camera ◽  
Ground Level ◽  
Surface Measurement ◽  
Landslide Monitoring ◽  
Close Range Photogrammetry ◽  
Digital Elevation ◽  
Close Range ◽  
Elevation Model

This paper presents the preliminary results of a simulation study on the production of low cost Digital Elevation Model (DEM) for a landslide study area in Seri Iskandar, Perak. The important objective of this paper is to present the potentiality of Close Range Photogrammetry (CRP) as a data acquisition tool in producing a Digital Elevation Model (DEM) by using data from surface measurement. This method was applied using stereopair photographs captured data from ground level detection, or known as close range photogrammetry with the use of a digital camera mounted on a tripod as a tool for data collection. Close Range Photogrammetry (CRP) applications is useful for mapping of areas that are difficult and risky to point manpower on terrain that consist of steep and dangerous slopes. Conventional methods require measurement using Electronic Distance Measuring (EDM), but this method is very costly and requires a survey team placed on the land site area. The research data were carried out with two different epoch data. The outcome proves that CRP can produce DEM with less cost compared to other methods.

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