Analysis of the altimetric accuracy of alos aw3d30 digital surface model for mato grosso do sul

Abstract

Mato Grosso do Sul presents environmental riches to stand out. The Pantanal, for example, is the largest wetland on the planet and is considered a natural patrimony of humanity by Unesco. The DSM (Digital Surface Models) are used for various applications, in terms of terrain representation. There are several MDS’s that are available for free. ALOS AW3D30 data was available for free in May 2015, and there are few studies to validate it. In this sense, the objective of this work was to evaluate the altimetric accuracy of the DSM ALOS AW3D30 for the State of Mato Grosso do Sul. We used data from 167 SAT-GPS stations of IBGE as altimetric reference points. For comparative purposes, the SRTM (30 m) version 3 was used, since it consists of one of the most known DSM, which presented more accurate results in a previous study. To develop the DSM analysis, the Cartographic Accuracy Standard for Digital Cartographic Products (PEC-PCD) was applied. We verified that the DSM ALOS AW3D30 presents RMSE (Root Mean Square Error) smaller than the SRTM, indicating that for the data evaluated presents greater accuracy. For the state of Mato Grosso do Sul, it is concluded that the altimetric accuracy of the ALOS AW3D30 data, as well as those of the SRTM, have accuracy compatible with the scale 1: 50,000, class A, PEC-PCD.