Evaluation of digital land and geopotential models in Ecuador

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Published: Sep 1, 2023
Updated: 2023-09-01
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2023-09-01 (2)
DOI: https://doi.org/10.17163/lgr.n38.2023.05
Keywords:
SRTM, ASTER GDEM, ALOS PALSAR, EGM 96, EGM 08, orthometric height, ellipsoidal height

Main Article Content

Oscar Portilla
Geoint CÍA. LTDA
https://orcid.org/0000-0001-5023-9333
César Leiva
Universidad de las Fuerzas Armadas
https://orcid.org/0000-0002-3332-6029
Marco Luna
Universidad de las Fuerzas Armadas
https://orcid.org/0000-0003-1433-2658
Izar Sinde
Universidad Politécnica de Madrid
https://orcid.org/0000-0001-8540-7974

Abstract

Engineering uses digital elevation models to perform calculations and modeling phenomena, since it allows determining the scale at which they can be used and the quality of the by-products obtained. Two groups of models were evaluated, the digital terrain models (DTMs): Shuttle Radar Topography Mission (SRTM), ASTER Global Digital Elevation Map (ASTER GDEM), ALOS PALSAR and the DTM generated by the Instituto Geográfico Militar del Ecuador (IGM), and the geopotential models (GMs): EGM96, EGM08 and the GM created by the IGM. For the evaluation, the geometric leveling points and ellipsoidal height raised in one of the IGM projects were used to determine atypical values, calculate the mean square error (RMSE) and define the precision and scale at which the different ones can be used. The heights between the DTMs were compared to know their difference. It was determined that the SRTM 30, ALOS PALSAR and IGM DMTs can be used for jobs that require an accuracy of less than 10 meters. The GM EGM08 together with high precision ellipsoidal heights could generate elevation models that can reach an accuracy of 1.25 meters, while the GMs EGM96 and IGM can generate models that achieve an accuracy of 2.5 meters. The ellipsoidal heights of the SRTM 30, ALOS PALSAR and IGM DTMs obtained with the EGM 96 and EGM 08 GMs can only be used in jobs that require an accuracy of less than 10 meters.

Article Details

Issue
Vol. 38 No. 2: (September 2023-February 2024)
Section
Scientific Article
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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

 Universidad Politécnica Salesiana of Ecuador preserves the copyrights of the published works and will favor the reuse of the works. The works are published in the electronic edition of the journal under a Creative Commons Attribution/Noncommercial-No Derivative Works 3.0 Ecuador license: works can be copied, used, disseminated, transmitted and publicly displayed.

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