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

Afonso de Paula dos Santos, Nilcilene das Graças Medeiros, Aluir Porfírio Dal Poz, Gérson Rodrigues dos Santos, Dalto Domingos Rodrigues, Paulo César Emiliano

Resumo


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.

Palavras-chave


positional accuracy; DSM; DEM; homologous point extraction; spatial data quality.



Direitos autorais 2020 Afonso de Paula dos Santos, Nilcilene das Graças Medeiros, Aluir Porfírio Dal Poz, Gérson Rodrigues dos Santos, Dalto Domingos Rodrigues, Paulo César Emiliano

Licença Creative Commons
Esta obra está licenciada sob uma licença Creative Commons Atribuição - NãoComercial 4.0 Internacional.

Boletim de Ciências Geodésicas. ISSN: 1982-2170