Horizontal And Vertical Measurement of UAV Aerial Photo Exposures Results In The Senowo River Area, Krinjing Village, of The Merapi Volcano, Magelang District of Central Java Indonesia

Abstract

Abstract This study aims to examine the acquisition of small format aerial photography with UAVs and to display orthophoto data for elevation data extraction. The research area was conducted in a part of the Senowo River north of Merapi volcano in Central Java. The Photogrammetric methods using UAV planes need to be done for horizontal and vertical accuracy studies. This accuracy study was carried out by referring to the height of the flying plane and the geometry accuracy of the Rupa Bumi Indonesia (RB I= Standardized Topographic Map of Indonesia) map. The results of this study are accuracy testing based on the comparison of the coordinates of the test points with the results of aerial photo processing obtained by horizontal RMSE of 0.034 meter and vertical RMSE of 0.598 meter with an accuracy of 98%. RMSE value is used to determine the value of Circural Error 90 (CE90) and Linear Error (LE90). The value obtained by CE90 is 0.25 meter and the LE90 value is 0.99 meter. The accuracy of the orthophoto map that can be made is a scale of 1: 2,500 in class 1st for horizontal accuracy and a scale of 1: 5,000 in class 1st for vertical accuracy. Therefore, in the selection of optimal scale orthophoto maps, the recommended scale is 1: 5,000. * PT. Wijaya Karya Jakarta Indonesia **Assc. Prof. of the Geography Department of Social Science Faculty UM