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

Authors

  • Afonso de Paula dos Santos <vlibraswidget>Universidade Federal de Viçosa - UFV, Departamento Eng. Civil, Setor de Eng. de Agrimensura e Cartográfica, Viçosa - MG, Brasil.</vlibraswidget> http://orcid.org/0000-0001-7248-4524
  • Nilcilene das Graças Medeiros <vlibraswidget>Universidade Federal de Viçosa - UFV, Departamento Eng. Civil, Setor de Eng. de Agrimensura e Cartográfica, Viçosa - MG, Brasil.</vlibraswidget> http://orcid.org/0000-0003-0839-3729
  • Aluir Porfírio Dal Poz Universidade Estadual Paulista - UNESP, Faculdade de Ciência e Tecnologia, Departamento de Cartográfica, Presidente Prudente - SP, Brasil. http://orcid.org/0000-0002-2534-1229
  • Gérson Rodrigues dos Santos Universidade Federal de Viçosa - UFV, Departamento de Estatística, Viçosa - MG, Brasil. http://orcid.org/0000-0002-4916-0908
  • Dalto Domingos Rodrigues Universidade Federal de Viçosa - UFV, Departamento Eng. Civil, Setor de Eng. de Agrimensura e Cartográfica, Viçosa - MG, Brasil. http://orcid.org/0000-0002-0325-8926
  • Paulo César Emiliano Universidade Federal de Viçosa - UFV, Departamento de Estatística, Viçosa - MG, Brasil. http://orcid.org/0000-0002-1314-9002

Keywords:

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

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.

Published

2020-08-27

How to Cite

Santos, A. de P. dos, Medeiros, N. das G., Poz, A. P. D., Santos, G. R. dos, Rodrigues, D. D., & Emiliano, P. C. (2020). METHODOLOGY FOR THE EXTRACTION OF HOMOLOGOUS POINTS FROM A DEM/DSM TO EVALUATE THE RELATIVE POSITIONAL ACCURACY. Bulletin of Geodetic Sciences, 26(2). Retrieved from https://revistas.ufpr.br/bcg/article/view/76108

Issue

Vol. 26 No. 2 (2020)

Section

Article

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