VERTICAL ACCURACY ASSESSMENT OF THE PROCESSED SRTM DATA FOR THE BRAZILIAN TERRITORY

Autores

  • Alex Gois Orlandi Universidade Federal de Brasília, Instituto de Humanas, Departamento de Geografia, Brasília, Distrito Federal, Brasil. http://orcid.org/0000-0003-3303-2642
  • Osmar Abílio de Carvalho Júnior Universidade Federal de Brasília, Instituto de Humanas, Departamento de Geografia, Brasília, Distrito Federal, Brasil.
  • Renato Fontes Guimarães Universidade Federal de Brasília, Instituto de Humanas, Departamento de Geografia, Brasília, Distrito Federal, Brasil. http://orcid.org/0000-0002-9555-043X
  • Edilson de Souza Bias Universidade Federal de Brasília, Instituto de Geociências, Brasília, Distrito Federal, Brasil. http://orcid.org/0000-0003-0334-0476
  • Douglas Corbari Corrêa Gabinete do Comando do Exército - Bloco A - 4º Piso – SMU, Brasília, Distrito Federal, Brasil. http://orcid.org/0000-0001-5288-4061
  • Roberto Arnaldo Trancoso Gomes Universidade Federal de Brasília, Instituto de Humanas, Departamento de Geografia, Brasília, Distrito Federal, Brasil. http://orcid.org/0000-0003-4724-4064

Palavras-chave:

SRTM mission, vertical accuracy, interferometry, digital elevation model.

Resumo

This research aims to determine the vertical accuracy of the Interferometric Digital Elevation Model (DEM) obtained from the processed Shuttle Radar Topographic Mission (SRTM) data. The research compared the SRTM-GL1 (Shuttle Radar Topographic Mission-Global 1) with 30-meter resolution and the following 90-meter resolution models: (a) EMBRAPA; (b) Hydrological data and maps based on Shuttle Elevation Derivatives at multiple Scales (HydroSHEDS) (HydroSHEDS), provided by the United States Geological Survey (USGS); (c) Consultative Group for International Agricultural Research-Consortium for Spatial Information (CGIAR-CSI); and (d) Jonathan de Ferranti. The accuracy analysis considered the diverse Brazilian regions, adopting 1,087 field points from the Global Navigation Satellite System (GNSS) trackers or topography methods. The Jonathan de Ferranti model achieved the best accuracy with RMSE of 9.61m among the 90-meter resolution models. Most SRTM models at 1:100,000 scale reached Grade A of the Cartographic Accuracy Standard. However, the accuracy at the 1: 50,000 scale did not achieve the same performance. SRTM errors are linearly related to slope and the most significant errors always occur in forest areas. The 30-meter resolution SRTM showed an accuracy of around 10% better (RMSE of 8.52m) than the model of Jonathan de Ferranti with 90-meter resolution (RMSE of 9.61m).

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Publicado

2019-05-31

Como Citar

Orlandi, A. G., Júnior, O. A. de C., Guimarães, R. F., Bias, E. de S., Corrêa, D. C., & Gomes, R. A. T. (2019). VERTICAL ACCURACY ASSESSMENT OF THE PROCESSED SRTM DATA FOR THE BRAZILIAN TERRITORY. Boletim De Ciências Geodésicas, 25(4). Recuperado de https://revistas.ufpr.br/bcg/article/view/72077

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