ANÁLISE DA PRECISÃO DO MODELO DIGITAL DE ELEVAÇÃO TOPODATA EM RELAÇÃO AO LEVANTAMENTO TOPOGRÁFICO ALTIMÉTRICO

Abstract

Remote sensing is indispensable for studies involving topography, from the work of photogrammetric restitution with a view to the altimetric mapping at different scales, based on the principles of stereoscopy, to obtaining digital elevation models. A digital elevation model (MDE) is represented by a numerical matrix whose values ​​correspond to the area elevation (Z), referenced to a spatial coordinate system (X and Y), or by a vector representation. Due to the high cost and time to perform topographic surveys, and the ease and availability of the MDEs, the objective of the work is to analyze the accuracy of the MDE Topodata compared to topographic survey trigonometric, performed in the area of ​​contribution of springs. Where the methodology was followed in stages: topographic survey and data processing; MDE acquisition and processing; and comparison with statistical and visual analyzes of the two instruments. Concluding that according to the PEC standard of cartographic accuracy, the MDE did not obtain accuracy for any topographic chart class, but this does not rule out the use and its great importance in environmental analyzes and diagnostics and also for the projection of works to be executed to the field, being countless and countless its applications.