METHODOLOGY FOR THE EXTRACTION OF HOMOLOGOUS POINTS FROM A DEM/DSM TO EVALUATE THE RELATIVE POSITIONAL ACCURACY

Abstract: This work presents a new methodology for extracting 3D homologous points from a DEM/DSM for relative evaluation of positional accuracies, from terrain features such as ridgelines and hydrography. Firstly, it extracts 3D intersection points between the linear features and then it performs a selection of these homologous points. A discussion regarding the spatial resolution effect of the DEM/DSM on the proposed methodology is carried out. As case study, the planimetric and altimetric positional accuracies evaluation of SRTM (X-band) and Aster GDEM (version 2) DSMs was conducted using, as reference, a DSM obtained via photogrammetry. The SRTM and Aster GDEM (version 2) DSMs showed similar classifications, that is, Class A for the altimetry and Class B for the planimetry at the 1:100,000 scale, according to the Brazilian technical standard of positional accuracy.

Bibliographic Details

Main Authors:	Santos,Afonso de Paula dos, Medeiros,Nilcilene das Graças, Poz,Aluir Porfírio Dal, Santos,Gérson Rodrigues dos, Rodrigues,Dalto Domingos, Emiliano,Paulo César
Format:	Digital revista
Language:	English
Published:	Universidade Federal do Paraná 2020
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1982-21702020000200202
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