INFLUÊNCIA DOS GCPS NA ACURÁCIA DE PRODUTOS CARTOGRÁFICOS A PARTIR DE VANT EM ÁREA DE GRANDE VARIAÇÃO ALTIMÉTRICA
Palavras-chave:
GCPs, pontos de controle, RMSE, VANT, SfM-CMVSResumo
O processamento de imagens obtidas por Veículos Aéreos não Tripulados (VANTs), com o avanço na técnica Structure from Motion – Multi-View Stereo (SfM-MVS), vem se popularizando nos estudos da área da Geociências, tendo diversas aplicações pelo seu baixo custo, rapidez e praticidade do método. A praticidade faz que usuários menos experientes utilizem o método e, por muitas vezes, a precisão cartográfica é negligenciada. A precisão e acurácia dos modelos obtidos com VANTs têm sido alvos de pesquisas recentes, mas carecendo ainda de estudos aprofundados no mapeamento de áreas escarpadas onde a amplitude altimétrica pode interferir na qualidade do modelo. A presente pesquisa teve por objetivo analisar a variação do erro médio quadrático (RMSE) de acordo com a influência do número de Ground Control Points (GCPs) e estimar uma quantidade ideal de pontos de controle que devem ser utilizados para produzir resultados acurados em uma área de extração de basalto a céu aberto em forma de patamares no estado do Rio Grande do Sul com uma variação altimétrica de aproximadamente 50m. Com um número de 10 a 16 GCPs foi observada uma estabilização do erros na área de estudo, mas outros fatores além do número dos GCPs se mostraram importantes na variação do erro, como distribuição dos pontos, iluminação, taxa de sobreposição das imagens e variação da escala devido à altura da foto.
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