Tuesday 23 August 2005

G2

PT0012
SRTM validation in Argentina and Brazil with emphasis to Amazon
Blitzkow, Denizar¹, Matos, Ana Cristina O C¹, Cintra, Jorge Pimentel¹
1 University of São Paulo-São Paulo, Brazil
Author email: dblitzko@usp.br
Shuttle Recovery Topography Mission (SRTM) produced the most important height information never available in the world. An extensive process of validation of the data derived from SRTM was carried out in different parts of South America using data available from several sources. This paper addresses the attention to Argentina, Brazil and Amazon area. All over Brazil a total of 62,030 BMs and 18,466 over Argentina, derived from spirit leveling, were used for a direct comparison. SRTM height was estimated in the BMs from a 32 grid using a bilinear spline for interpolation. The coordinates of the BMs may have inconsistencies with respect to SRTM grid because they have been derived from topographic maps in the scales of 1:50,000 and 1:100,000, very often with the impossibility to identify the correct position of the BM. In 85% of the BMs in Brazil and 70% in Argentina the differences remained in the interval of 0 to 20m, coherent with the absolute error of SRTM that it is 16 m. A total of 2,525 and 3,280 for the two countries respectively the differences were greater than 50m. In the Amazon area SRTM was compared with 7 other models: DTM2002, GLOBE, GTOPO30, ETOPo², ETOPO5, TERRAINBASE and JGP95E. The analysis have been carried out in blocks of 1o x 1o. The attention was addressed to areas with different characteristics like: basin, rivers, umbriferous forest and anthropic areas. The results show different features in the mentioned areas. Several profiles have been drawn in blocks of 1o x 1o passing through the highest point of the block where the features can be seen.

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