Digital elevation model for the a1 sub-region of the Salado river master plan and for the city of Junin
Keywords:
Salado River Basin, Master Plan of Salado Basin, digital elevation model, geoid, tdaGEOBAAbstract
The present work presents a digital elevation model (DEM) for sub-basin A1 that is included in the Salado River basin and another DEM for the city of Junín. Thus, the work was divided into two regions; a macro (basin level) and a much smaller one (city of Junín). The building of DEMs for each area involved the analysis of global terrain models derived from SRTM mission and ASTER sensor, the study of their vertical error and the validation of the information. This was done through ground control points (GCP), represented by GPS/leveling points for the sub-basin DEM case and with altimetric points for the city of Junín. It was also necessary to use tools such as global geopotential models and the tdaGEOBA height transformation model.
The main results achieved can be summarized as follows: 1-the SRTM3 model was the most suitable to model the topography at sub-basin level A1; 2-the global geoid model EGM08 corrected by 32 a constant value is a very accurate tool to extrapolate tdaGEOBA to the south of Santa Fe province; the latter was suitable to correct the SRTM3 model (once disaffected from the EGM96 geoid model) in the entire study region; 3 - in flat areas the corrected SRTM3 model showed errors with a submetric standard deviation; 4- the city of Junín has a network of altimetric points that allowed to obtain an urban DEM with a decimetric precision, which is consistent with the corrected SRTM3 in countryside places.
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