ALTIMETRY ASSESSMENT OF ASTER GDEM v2 AND SRTM v3 DIGITAL ELEVATION MODELS: A CASE STUDY IN URBAN AREA OF BELO HORIZONTE, MG, BRAZIL

Authors

  • Josyceyla Duarte Morais Universidade Federal de Minas Gerais
  • Thaísa Santos Faria Universidade Federal de Minas Gerais
  • Marcos Antonio Timbó Elmiro Universidade Federal de Minas Gerais
  • Marcelo Antonio Nero Universidade Federal de Minas Gerais
  • Archibald de Araujo Silva Universidade de São Paulo
  • Rodrigo Affonso de Albuquerque Nobrega Universidade Federal de Minas Gerais

Keywords:

Digital Elevation Models, ASTER GDEM v2, SRTM v3, Altimetry Assessment

Abstract

This work is an altimetry evaluation study involving Digital Elevation Models ASTER GDEM version 2 and SRTM version 3. Both models are readily available free of charge, however as they are built from different remote sensing methods it is also expected that they present different data qualities. LIDAR data with 25 cm vertical accuracy were used as reference for assessment validation. The evaluation study, carried out in urbanized area, investigated the distribution of the residuals and the relationship between the observed errors with land slope
classes. Remote sensing principles, quantitative statistical methods and the Cartographic Accuracy Standard of Digital Mapping Products (PEC-PCD) were considered. The results indicated strong positive linear correlation and the existence of a functional relationship between the evaluated models and the reference model. Residuals between -4.36 m and 3.11 m grouped 47.7% of samples corresponding to ASTER GDEM and 63.7% of samples corresponding to SRTM. In both evaluated models, Root Mean Square Error values increased with increasing of land slope. Considering 1: 50,000 mapping scale the PEC-PCD classification indicated class B standard for SRTM and class C for ASTER GDEM. In all analyzes, SRTM presented smaller altimetry errors compared to ASTER GDEM, except in areas with steep relief.

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Published

2017-12-08

How to Cite

Morais, J. D., Faria, T. S., Elmiro, M. A. T., Nero, M. A., Silva, A. de A., & Nobrega, R. A. de A. (2017). ALTIMETRY ASSESSMENT OF ASTER GDEM v2 AND SRTM v3 DIGITAL ELEVATION MODELS: A CASE STUDY IN URBAN AREA OF BELO HORIZONTE, MG, BRAZIL. Bulletin of Geodetic Sciences, 23(4). Retrieved from https://revistas.ufpr.br/bcg/article/view/56804

Issue

Vol. 23 No. 4 (2017)

Section

Article

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