Quality Assessment of Globally Available Digital Elevation Model (DEM) for Mountainous Region

2021 ◽  
Vol 5 (1) ◽  
pp. 11-21
Author(s):  
Sangay Gyeltshen ◽  
Krisha Kumar Subedi ◽  
Laylo Zaridinova Kamoliddinovna ◽  
Jigme Tenzin
Keyword(s):  
Digital Elevation Model ◽  
Vertical Displacement ◽  
Satellite System ◽  
Topographic Map ◽  
Alos Palsar ◽  
Aster Gdem ◽  
Digital Elevation ◽  
The Government ◽  
Elevation Model ◽  
The Individual

The study assessed the accuracies of globally available Digital Elevation Models (DEM’s) i.e., SRTM v3, ASTER GDEM v2 and ALOS PALSAR DEM with respect to Topo-DEM derived from topographic map of 5m contour interval. 100 ground control points of the elevation data were collected with the help of kinematic hand held GNSS (Global Navigation Satellite System), randomly distributed over the study area. The widely used RMSE statistic, NCC correlation and sub-pixel-based approach were applied to evaluate the erroneous, correlation, horizontal and vertical displacement in terms of pixels for the individual Digital Elevation Model. Following these evaluations, SRTM DEM was found to be highly accurate in terms of RMSE and displacement compared to other DEMs. This study is intended to provide the researchers, GIS specialists and the government agencies dealing with remote sensing and GIS, a basic clue on accuracy of the DEMs so that the best model can be selected for application on various purposes of the similar region.

scholarly journals Line Generalization Evaluation on Contour Map Generated From SRTM and ASTER GDEM

2018 ◽  
Vol 2 (1) ◽  
pp. 88-97
Author(s):  
Totok Wahyu Wibowo
Keyword(s):  
Digital Elevation Model ◽  
Thermal Emission ◽  
Contour Line ◽  
Topographic Map ◽  
Contour Map ◽  
Thematic Map ◽  
Shuttle Radar Topographic Mission ◽  
Aster Gdem ◽  
Digital Elevation ◽  
Elevation Model

A contour map is one of many layers that composed Informasi Geospasial Dasar (IGD), which according to Act. No 4 2011 serves as a reference for any thematic map. The provision of contour map at a different level of scale is needed since mapping activities will always refer to map scale based on the mapping area. This research aims to analyze automated contour generation quality to produce 1:50.000 contour map, by means of using open access Digital Elevation Model (DEM) data, such as Shuttle Radar Topographic Mission (SRTM) and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Digital Elevation Model (GDEM). The automated contour generation was done by using contour interpolation in Quantum GIS software. Furthermore, simplification and smoothing algorithm was applied to both data, in order to improve their visual appearance. In this case, there are four algorithms used in the study, namely Douglas-Peucker, Visvalingam, Chaikin, and McMaster. Quality assessment, both qualitative and quantitative assessment, was done to each derived contour map to ensure the applicability of the procedure. The result shows that contour map generated from SRTM has a better quality than contour map generated from ASTER GDEM. Nevertheless, both data has a similar pattern on each topographical classes, which tends to produce bad quality contour line in the flat area. The more mountainous the area, the better the contour line. Meanwhile, of all generalization algorithm applied in this study, Chaikin’s algorithm is the best algorithm in terms of smoothing the contour line and improving visual quality, but still doesn’t significantly improved the metric accuracy. The contour line can be either directly added to the Digital Cartographic Model of Topographic Map (Rupabumi Map), or used as compliance data in a thematic map.

scholarly journals A new 100-m Digital Elevation Model of the Antarctic Peninsula derived from ASTER Global DEM: methods and accuracy assessment

2012 ◽  
Vol 4 (1) ◽  
pp. 129-142 ◽  
Author(s):  
A. J. Cook ◽  
T. Murray ◽  
A. Luckman ◽  
D. G. Vaughan ◽  
N. E. Barrand
Keyword(s):  
Digital Elevation Model ◽  
Antarctic Peninsula ◽  
Accuracy Assessment ◽  
Correction Method ◽  
Pixel Size ◽  
Aster Gdem ◽  
Digital Elevation ◽  
Vertical Accuracy ◽  
Elevation Model ◽  
The Antarctic

Abstract. A high resolution surface topography Digital Elevation Model (DEM) is required to underpin studies of the complex glacier system on the Antarctic Peninsula. A complete DEM with better than 200 m pixel size and high positional and vertical accuracy would enable mapping of all significant glacial basins and provide a dataset for glacier morphology analyses. No currently available DEM meets these specifications. We present a new 100-m DEM of the Antarctic Peninsula (63–70° S), based on ASTER Global Digital Elevation Model (GDEM) data. The raw GDEM products are of high-quality on the rugged terrain and coastal-regions of the Antarctic Peninsula and have good geospatial accuracy, but they also contain large errors on ice-covered terrain and we seek to minimise these artefacts. Conventional data correction techniques do not work so we have developed a method that significantly improves the dataset, smoothing the erroneous regions and hence creating a DEM with a pixel size of 100 m that will be suitable for many glaciological applications. We evaluate the new DEM using ICESat-derived elevations, and perform horizontal and vertical accuracy assessments based on GPS positions, SPOT-5 DEMs and the Landsat Image Mosaic of Antarctica (LIMA) imagery. The new DEM has a mean elevation difference of −4 m (± 25 m RMSE) from ICESat (compared to −13 m mean and ±97 m RMSE for the original ASTER GDEM), and a horizontal error of less than 2 pixels, although elevation accuracies are lower on mountain peaks and steep-sided slopes. The correction method significantly reduces errors on low relief slopes and therefore the DEM can be regarded as suitable for topographical studies such as measuring the geometry and ice flow properties of glaciers on the Antarctic Peninsula. The DEM is available for download from the NSIDC website: http://nsidc.org/data/nsidc-0516.html (doi:10.5060/D47P8W9D).

scholarly journals PENENTUAN TINGKAT BAHAYA EROSI DI WILAYAH DAS BEDADUNG KABUPATEN JEMBER

2020 ◽  
Vol 8 (1) ◽  
pp. 1-11
Author(s):  
Idah Andriyani ◽  
Sri Wahyuningsih ◽  
Rosalina Sekar Arumsari
Keyword(s):  
Digital Elevation Model ◽  
Soil Loss ◽  
Universal Soil Loss Equation ◽  
Data Input ◽  
Aster Gdem ◽  
Digital Elevation ◽  
Elevation Model ◽  
Soil Loss Equation

Kondisi perkembangan Daerah Aliran Sungai (DAS) di wilayah Kabupaten Jember untuk saat ini perlu dievaluasi karena kondisinya sudah rusak mulai dari tahun 1999. Hal ini dapat menimbulkan bencana alam di kawasan DAS seperti tanah longsor, erosi dan banjir yang memakan korban jiwa. Tujuan dari penelitian ini adalah mengetahui besarnya tingkat bahaya erosi yang dipengaruhi oleh beberapa nilai parameter erosi menggunakan metode Revised Universal Soil Loss Equation (RUSLE) di DAS Bedadung. Data input yang digunakan pada penelitian ini yaitu curah hujan tahun 2004 - 2014, peta jenis tanah, peta penggunaan lahan RBI tahun 2014, dan data Digital Elevation Model (DEM) dari ASTER-GDEM. Hasil penelitian menunjukkan bahwa nilai parameter erosivitas hujan (R) DAS Bedadung rata-rata 1708,70 MJ.cm/tahun. Parameter erodibilitas tanah (K) didominasi jenis tanah latosol dengan nilai K sebesar 0,26. Parameter panjang dan kemiringan lereng (LS) didominasi kelas datar yaitu dengan besar kemiringan 0-8%. Parameter vegetasi penutupan lahan dan pengelolaan tanah (CP) didominasi sawah irigasi dengan nilai CP sebesar 0,02. Laju erosi DAS Bedadung sebesar 160,57 ton/ha.tahun, laju erosi ini termasuk pada kondisi sedang. Tingkat bahaya erosi pada DAS Bedadung didominasi pada tingkat sangat rendah yaitu besar erosi berkisar 0-15 (ton/ha.tahun) atau 62,20% dari luas wilayahnya.

scholarly journals The draa Cerro Medanoso (Atacama, Chile) and its importance in the study of desert

2016 ◽  
pp. 25
Author(s):  
José F. Araya Vergara ◽  
Ricardo Vilaró
Keyword(s):  
Digital Elevation Model ◽  
Satellite Imagery ◽  
Morphological Analysis ◽  
Aerial Photos ◽  
Desert Pavement ◽  
Aster Gdem ◽  
Digital Elevation ◽  
The World ◽  
Long Time ◽  
Elevation Model

This work presents a morphological analysis of the Cerro Medanoso draa (Atacama Marginal Desert) and the type of contact with the desert pavements of neighboring glacis and piedmont. This study is based on an analysis of aerial photos, and a digital elevation model. Aster GDEM was used as a basis for the survey. Fieldwork observations covered two principal zones: the nucleus and the envelope. Following fieldwork, analysis of satellite imagery was conducted. It was possible to identify the following phases of formation: construction of a stellate nucleus, merging of the eastern envelope, merging of the southern envelope and merging of a complex western envelope. The southeastern facing envelope is much bigger than the northwestern facing one. Consequently, the construction of the complex draa is asymmetric. The correlation of this megadune with similar star and compound draas to other deserts in the world indicates that the closest analogue exists in Namibia, but without merging signals between the envelope and the nucleus. Star draas observed in other deserts exhibit a lack of this envelope. With reference to the neighboring piedmont, the beginning of its deflation must be necessarily correlative to the initial construction of the nuclear twin star draa. The later deflation could be responsible for the pulses, which formed the envelope. Therefore, the neighboring desert pavement and the draa are correlative landforms, which represent a very long time formation, in an important part of the desert history, as evidenced by the cited and referenced research works.

scholarly journals Comparison of Digital Elevation Models for Determining the Area and Volume of the Water Reservoir

2021 ◽  
pp. 37-45
Author(s):  
M. Bakiev ◽  
K. Khasanov
Keyword(s):  
Mean Squared Error ◽  
Control Point ◽  
Water Reservoir ◽  
Longitudinal Profile ◽  
Topographic Map ◽  
Alos Palsar ◽  
Aster Gdem ◽  
Digital Elevation ◽  
Longitudinal Profiles ◽  
Area And Volume

Nowadays, like many other fields, DEM is widely used in the field of hydraulic engineering. In our studies, we compared the DEMs (SRTM, ASTER GDEM v2, and ALOS PALSAR) for the area recommended for the construction of the Shurbulak water reservoir. Contours were developed for all DEMs and were compared with the contours of a topographic map. The contours of the SRTM and ALOS PALSAR closely match with the contours on the topographic map than ASTER. Vertical differences between SRTM, ASTER GDEM2, and ALOS PALSAR products were computed the root mean squared error (RMSE) compared to Ground Control Point (GCP) data. RMSE results show that 3.53 m for ALOS PALSAR, 6.27 m for ASTER and 4.09 m for SRTM. The longitudinal profiles of dams (No. 1 and No. 2) of all DEMs were compared with the data of the design institute - UzGIP. The results of comparing the longitudinal profile of the dam (No. 1 and No. 2) on digital ALOS PALSAR models correspond to the longitudinal profile of dams (No. 1 and No. 2) developed by the design institutes. Viewed as a result of all comparisons (comparison of DEMs and topographic map, computed RMSE, comparison longitudinal profile of the dam) ALOS PALSAR is more accurate than other DEMs. Therefore, we decided to use ALOS PALSAR for the determination of water reservoir area and volume. The area and volume of the reservoir were determined using the digital model ALOS PALSAR.

scholarly journals Evaluation of the Accuracy of Digital Elevation Model Produced from Different Open Source Data

2019 ◽  
Vol 25 (8) ◽  
pp. 100-112
Author(s):  
Raghad Hadi Hasan
Keyword(s):  
Open Source ◽  
Digital Elevation Model ◽  
Thermal Emission ◽  
Shuttle Radar Topography Mission ◽  
Google Earth ◽  
Reference Points ◽  
Aster Gdem ◽  
Digital Elevation ◽  
Elevation Model ◽  
High Level

This study aims to estimate the accuracy of digital elevation models (DEM) which are created with exploitation of open source Google Earth data and comparing with the widely available DEM datasets, Shuttle Radar Topography Mission (SRTM), version 3, and Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Digital Elevation Model (ASTER GDEM), version 2. The GPS technique is used in this study to produce digital elevation raster with a high level of accuracy, as reference raster, compared to the DEM datasets. Baghdad University, Al Jadriya campus, is selected as a study area. Besides, 151 reference points were created within the study area to evaluate the results based on the values of RMS.Furthermore, the Geographic Information System (GIS) was utilized to analyze, imagine and interpolate data in this study. The result of the statistical analysis revealed that RMSE of DEM related to the differences between the reference points and Google Earth, SRTM DEM and ASTER GDEM are 6.9, 5.5 and 4.8, respectively. What is more, a finding of this study shows convergence the level of accuracy for all open sources used in this study.  

scholarly journals Evaluating the Vertical Accuracy of DEM Generated from ZiYuan-3 Stereo Images in Understanding the Tectonic Morphology of the Qianhe Basin, China

2021 ◽  
Vol 13 (6) ◽  
pp. 1203
Author(s):  
Zhiheng Liu ◽  
Ling Han ◽  
Zhaohui Yang ◽  
Hongye Cao ◽  
Fengcheng Guo ◽  
...  
Keyword(s):  
Digital Elevation Model ◽  
Tectonic Uplift ◽  
Mountainous Area ◽  
Stereo Images ◽  
Rapid Acquisition ◽  
Aster Gdem ◽  
Digital Elevation ◽  
Evolutionary Response ◽  
Elevation Difference ◽  
Elevation Model

Currently available high-resolution digital elevation model (DEM) is not particularly useful to geologists for understanding the long-term changes in fluvial landforms induced by tectonic uplift, although DEMs that are generated from satellite stereo images such as the ZiYuan-3 (ZY3) satellite include characteristics with significant coverage and rapid acquisition. Since an ongoing analysis of fluvial systems is lacking, the ZY3 DEM was generated from block adjustment to describe the mountainous area of the Qianhe Basin that have been induced by tectonic uplift. Moreover, we evaluated the overall elevation difference in ZY3 DEM, Shuttle Radar Topography Mission (1″ × 1″) (SRTM1), and Reflection Radiometer Global Digital Elevation Model (ASTER GDEM) by using the Ice Cloud and Land Elevation Satellite/Geoscience Laser Altimeter (ICESat/GLAH14) point cloud and a DEM of 1:50,000 scale. The values of the root mean square error (RMSE) of the elevation difference for ZY3 DEM were 9.31 and 9.71 m, respectively, and are in good agreement with SRTM1. The river long profiles and terrace heights were also extracted to compare the differences in channel steepness and the incision rates with SRTM1 and ASTER GDEM. Our results prove that ZY3 DEM would be a good alternative to SRTM1 in achieving the 1:50,000 scale for DEM products in China, while ASTER GDEM is unsuitable for extracting river longitudinal profiles. In addition, the northern and southern river incision rates were estimated using the ages and heights of river terraces, demonstrating a range from 0.12–0.45 to 0.10–0.33 m/kyr, respectively. Collectively, these findings suggest that ZY3 DEM is capable of estimating tectonic geomorphological features and has the potential for analyzing the continuous evolutionary response of a landscape to changes in climate and tectonics.

scholarly journals IDENTIFIKASI ZONA RESERVOAR PANAS BUMI BERDASARKAN ANALISIS FAULT FRACTURE DENSITY CITRA DIGITAL ELEVATION MODEL ALOS PALSAR DI GUNUNG RAJABASA

2021 ◽  
Vol 16 (2) ◽  
pp. 119-131
Author(s):  
I Gede Boy Darmawan ◽  
Dirga Ilham Fahlevi ◽  
Muhammad Farhan Yassar ◽  
Fachri Aldi Pramudya
Keyword(s):  
Digital Elevation Model ◽  
Fracture Density ◽  
Alos Palsar ◽  
Digital Elevation ◽  
Elevation Model

Gunung Rajabasa merupakan salah satu lapangan panas bumi di Sumatra yang belum dapat dieksploitasi hingga saat ini. Keberadaan manifestasi di daerah ini menjadi petunjuk keberadaan zona reservoar panas bumi. Penelitian ini bertujuan untuk mengidentifikasi zona permeabilitas tinggi berdasarkan analisis Fault Fracture Density (FFD) dan menganalisis keterkaitan antara karakteristik struktur jalur fluida panas bumi ke permukaan dengan lokasi zona reservoar panas bumi. Metode FFD dilakukan dengan menggunakan Citra Digital Elevation Model (DEM) ALOS PALSAR untuk memetakan kelurusan/lineament yang berasosiasi dengan zona patahan maupun rekahan khususnya di area manifestasi. Observasi struktur di lapangan dilakukan untuk mengkonfirmasi hasil FFD. Arah dominan dari struktur yang teridentifikasi sebagian selaras dan searah dengan sistem sesar Sumatra yaitu arah Barat Laut – Tenggara dan sebagian menunjukkan respons yang memotong sistem sesar utama. Selanjutnya, hasil analisis FFD menunjukkan keterkaitan yang cukup signifikan antara zona lemah (fracturing) dengan zona reservoar panas bumi yang ditunjukkan oleh pola densitas struktur tinggi pada zona upflow di manifestasi Way Belerang, sedangkan pada zona outflow di manifestasi mata air panas Gunung Botak berada pada densitas struktur yang rendah.

Sign in / Sign up

Export Citation Format

Share Document