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Avaliação da acurácia posicional das imagens do satélite CBERS-4 sensor MUX

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Orbital images have been widely used nowadays, and they have been aided the process of cartographic updating. CBERS-4 is a satellite that was developed, in partnership, between Brazilian and Chinese government. Since it is a recent satellite, there are a few studies about the images positional quality, and the products created of them. Therefore, this research objective was analyze the positional accuracy of two CBERS-4 sensor MUX images. One of the images was obtained by the Chinese images processing center, and the other image was obtained by the Brazilian images processing center. Located at the city of Viçosa-MG, the study area was Sāo Bartolomeu basin zone. ArcGIS software was used to collect and manipulate homologous points, through orbital images acquired of CBERS-4 satellite, and Ikonos satellite orthorectified image, 1:10,000 scale, as reference. These points, posteriorly, were analyzed and classified by GEOPEC software, which uses the positional accuracy of Brazilian standard. Law number 89,817 defines this standard. CBERS-4 available image, processed in China, got classification B for 1:1,000,000 scale, and it was classified as tendentious. But, it got classification A after being translated, for a 1:100,000 scale, and it was classified as non-tendentious. The tendency test which uses circular directional average, and circular variance was used to define if the images were tendentious. CBERS-4 available image, processed in Brazil, got classification A for 1:50,000 scales, and it was classified as tendentious. It got classification A even after being translated, for a 1:50,000 scales, and it was classified as non-tendentious.