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Development and Accuracy Assessment of High-Resolution Digital Elevation Model Using GIS Approaches for the Nile Delta Region, Egypt
Faculty
Engineering
Year:
2018
Type of Publication:
ZU Hosted
Pages:
Authors:
Mohammed Ahmed Ali Alashkar
Staff Zu Site
Abstract In Staff Site
Journal:
American Journal of Geographic Information System Scientific & Academic Publishing
Volume:
Keywords :
Development , Accuracy Assessment of High-Resolution Digital Elevation
Abstract:
A high accuracy Digital Elevation Model (DEM) for the Nile delta region, Egypt is needed for several environmental applications, particularly for investigating the hazardous impacts of sea level rise and land subsidence phenomena. Since there is no official published national DEM for Egypt, an original high accuracy local digital elevation model (LDEM) for that region has been created using nine Spatial Interpolation Methods (SIMs) within a Geographic Information Systems (GIS) environment. The interpolation process took place after digitizing over than 220 topographic maps of scale 1:25,000, where more than 810,000 elevation (spot heights) points have been extracted from these maps. Multiple parameters and criteria for each SIM were applied to reach the optimal settings to produce a LDEM for environmental applications. The developed LDEMs have been compared against eight free Global Digital Elevation Models (GDEMs) using about 200 known GPS/levelling Ground Control Points (GCPs), where a statistical assessment has been accomplished for both GDEMs and LDEMs residuals after applying a vertical and horizontal datum matching for all the used data sets, and an outlier detection procedure. Also, a Reliability Index (RI) has been calculated to determine the best DEM for the Nile Delta region. The accomplished results showed that EARTHEnv-DEM90 attained the highest RI of 5.47 as the optimum global DEM. For local DEM's interpolation methods, it is concluded that the Kriging-based local DEM attained highest RI of 9.27. Consequently, it has been concluded that the new developed high accuracy LDEM improves the overall accuracy and reliability of the best available GDEM by almost 41%, and, hence, it is appropriate for geospatial, environmental, and GIS studies in Egypt.
Author Related Publications
Mohammed Ahmed Ali Alashkar , "Determination of local gravimetric geoid model over Egypt using LSC and FFT estimation techniques based on different satellite- and ground-based datasets", Taylor & Francis, 2021
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Mohammed Ahmed Ali Alashkar , "On the Accuracy Assessment of the Latest Releases of GOCE Satellite-Based Geopotential Models with EGM2008 and Terrestrial GPS/Levelling and Gravity Data over Egypt", Scientific Research Publishing, 2016
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Mohammed Ahmed Ali Alashkar , "Accuracy Assessment of GPS Leveling Applications: Case Study, North West Lake Nasser Aswan, Egypt", Ain Shams University, Faculty of Engineering, 2016
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Mohammed Ahmed Ali Alashkar , "An Improved Local Geoid Model for Egypt using Satellite Geopotetial and Terrestrial Data", Ain Shams University, Faculty of Engineering, 2017
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Mohammed Ahmed Ali Alashkar , "EGY-HGM2016: an improved hybrid local geoid model for Egypt based on the combination of GOCE-based geopotential model with gravimetric and GNSS/levelling measurements", Springer, 2017
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Ahmed Hessien Mahmoud Mohamed Elyamany, "A Performance Evaluating Model For Construction Companies: Egyptian Case Study", ASCE, 2008
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