Análise comparativa de redes hidrológicas geradas a partir de superfícies hidrologicamente consistentes
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2014-12
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Resumo
One of the biggest challenges concerning hydrological analyses is the morphometric
characterization and delineation of the hydrographic network associated with a
basin. Therefore, this study aimed at comparing the qualitative and quantitative of
geomorphometic parameters extracted from hydrological networks produced from
original and hydrologically consistent surfaces. At first, were elaborated two
datasets were elaborated. The first, denominated original, organized from surfaces
without any correction and the second, denominated corrected, derived from the
hydrologically correct surfaces. Drainage maps were automatically extracted from
each digital terrain model (DTM) and digital elevation model (DEM), before and
after corrections for a posterior comparison between the estimated and the reference
networks. Comparisons were made considering the 1:100.000scale. It was noticed
that the distances between the networks were directly proportional to the spatial
resolution of the surfaces data, except for GDEM, which even with spatial
resolution of 30meters, presented inferior results than DEM SRTM with spatial
resolution of 90meters. The corrected Topodata surface was less sensitive to
changes, with an average distance (before and after corrections) of only 24.5 meters.
The drainage, extracted from SRTM presented the worst unconformity,76 meters.
Finally, the drainage extract from high-resolution DTMs presented similar results,
with the beet adjustment for DTM produced from aerial photogrammetry.
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MDEHC, MDT, Condicionamento de MDE, Comparação, DEMHC, DTM, DEM Reconditioning, Comparison
Citação
RIBEIRO, Hugo José; FERREIRA, Nilson Clementino. Análise comparativa de redes hidrológicas geradas a partir de superfícies hidrologicamente consistentes. Boletim de Ciências Geodésicas, Curitiba, v. 20, n. 4, p. 784-805, out./dez. 2014.