Evaluation of the Accuracy of the Mosaic DEM Generated with Stereo Images of the Peruvian Satellite System (Perú)

The Peruvian satellite system provides stereo-capable images that allow users to generate digital elevation models. However, most DEMs generated are considered representative and do not have the positional control analysis determining the quality of the same serious limiting factor for their use in cartography. This paper describes the extraction of the Lima Dem Mosaic at 3 m of spatial resolution generated with tri-stereo and stereo images of the Pleiades, Spot, and PeruSAT satellites and 114 geodetic control points. The rational functions mathematical model was used to generate the MosaicoDem, choosing as the mesh size of the DEM a dimension of 3 × 3 m. To verify the final accuracy in the vertical, 74 checkpoints were used. For the analysis of the positional accuracy of the DEM, the National Standard for Spatial Data Accuracy (NSSDA) of the US Federal Geographic Data Committee was used. Finally, to determine the data normality, the Kolmogorov Smirnov test was made. The results show an RMSE of 2.68 and an accuracy in the vertical of 5.25 m. Furthermore, the analysis of the influence of the slope in the errors does not show significant variation.