TY - DATA T1 - ALTIMETRY ASSESSMENT OF ASTER GDEM v2 AND SRTM v3 DIGITAL ELEVATION MODELS: A CASE STUDY IN URBAN AREA OF BELO HORIZONTE, MG, BRAZIL PY - 2017/12/20 AU - Josyceyla Duarte Morais AU - Thaísa Santos Faria AU - Marcos Antonio Timbó Elmiro AU - Marcelo Antonio Nero AU - Archibald de Araujo Silva AU - Rodrigo Affonso de Albuquerque Nobrega UR - https://scielo.figshare.com/articles/dataset/ALTIMETRY_ASSESSMENT_OF_ASTER_GDEM_v2_AND_SRTM_v3_DIGITAL_ELEVATION_MODELS_A_CASE_STUDY_IN_URBAN_AREA_OF_BELO_HORIZONTE_MG_BRAZIL/5720158 DO - 10.6084/m9.figshare.5720158.v1 L4 - https://ndownloader.figshare.com/files/10049458 L4 - https://ndownloader.figshare.com/files/10049461 L4 - https://ndownloader.figshare.com/files/10049464 L4 - https://ndownloader.figshare.com/files/10049467 L4 - https://ndownloader.figshare.com/files/10049470 L4 - https://ndownloader.figshare.com/files/10049473 L4 - https://ndownloader.figshare.com/files/10049476 L4 - https://ndownloader.figshare.com/files/10049479 L4 - https://ndownloader.figshare.com/files/10049482 L4 - https://ndownloader.figshare.com/files/10049485 KW - Digital Elevation Models KW - ASTER GDEM v2 KW - SRTM v3 KW - Altimetry Assessment N2 - 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. ER -