Evaluation of hydrological consistency of DEMs derived from SRTM and ASTER2 in three levels of interpolation

Evaluation of hydrological consistency of DEMs derived from SRTM and ASTER2 in three levels of interpolation
Guilherme de Castro Oliveira1, Maola Monique Faria2 and Elpídio Inácio Fernandes Filho3

1.Department Lands, Federal University of Viçosa, Av.Ph Rolfs s/n, Viçosa-MG (guilhermecastrol86@gmail.com)
2. Department Lands, Federal University of Viçosa, Av.Ph Rolfs s/n, Viçosa-MG (maolageo@gmail.com)
3. Department Lands, Federal University of Viçosa, Av.Ph Rolfs s/n, Viçosa-MG (elpidio@ufv.br)

Abstract: This study evaluated the accuracy of drainage models generated from the interpolation of SRTM and ASTER2 by Topo to Raster in three levels for a basin in Viçosa (MG). The standard used to classify the mapping quality was the PEC (Cartographic Accuracy Standards). We also evaluated the proportional representation of drainage in relation to reference database (IBGE) and the total area of sinks in each DEM generated interpolated. The interpolation increased the planimetric accuracy of generated drainage networks and the addition of hydrographic contributed to its better design. The PEC scale 1:100.000 for ASTER2 and SRTM was Class B and C, respectively. The representation of the drainage of the models compared to reference responded positively to the interpolation, but the maximum value reached was 59.8% for treatment 3 in ASTER2.

Keywords: Accuracy, ASTER 2, SRTM, interpolation, PEC, drainage network.

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