Avaliação do padrão de exatidão cartográfica de imagem do sensor Wordview
The Brazilian Army through a cooperation agreement with the National Geospatial-Intelligence Agency began to receive images from Worldview sensor. But to be able to use this new materials in the cartographic production it is necessary to evaluate the geometric quality of this new images and this paper aims to do so. The first step of the methodological approach is to choose the correct image, in this paper we choose the image near of Amazon Stadium because it is easier to measure the GPS points. After that a set is chosen of point extracted from the image, then go to the field and perform the measurement of the GPS points, the processing of the observed data and by last classify the product by the Cartographic Standard of Accuracy (CAS). The methodology that defines a statistical analysis of the planimetric accuracy is composed by the trend and the accuracy analysis. The trend analysis was accomplished using the Student’s-t test with the objective to discover the presence of systematic error in both Cartesian directions. The accuracy analysis was performed using the chi-square statistical test, where sample variances were compared to the standard values pre-established by the Brazilian Cartographic Accuracy Standards law. After applying the methodology, it was observed that the Worldview was evaluated according to the CAS, in class B to cartographic document, for the scale of 1:5.000 and in class A, for the scale of 1:10.000.