Abstract

MAMANI GUTIERREZ, Huber Augusto. APPLICATION OF THE LOCAL TOPOGRAPHIC PLANE (PTL) ON A MAP (ORTHOMOSAIC) OBTAINED BY PHOTOGRAMMETRY (UAV - DRONE), TESTAREA: University Campus (Cota-Cota) UMSA, Ciudad de La Paz-Bolivia  . Rev. Tecnológica [online]. 2023, vol.19, n.25, pp. 1-10. ISSN 1729-7532.

ABSTRACT The research applies the Local Topographic Plane (PTL), in photogrammetric surveys supported by a UAV (Unmanned Aerial Vehicle - Drone), considering that the orthomosaics generated by the Universal Transverse Mercator (UTM) projection are not related to the distances of the terrain (topographic horizontal distance). Thus making it difficult to directly determine distances on the orthomosaics for engineering and cadastral work. The photogrammetric survey with UAV applied all the procedures and protocols required to generate orthomosaics in the UTM projection and in PTL. In addition, the survey of elements and distances was carried out with a total station (ET) and field tape measure (CM), of the topographic horizontal distance (determination in the field). The data obtained allowed us to compare values of distance and position of the corners, limits, distance of elements and erected constructions. Finding minor differences in millimeters for values corresponding to the orthomosaic in (PTL), and not for the UTM projection. Highlighting that the measurements with a tape measure (CM) are similar to the values collected with a total station (ET) and these values; with the orthomosaic in (PTL). Unlike the UTM projection that presents significant variations. Therefore, by applying the (PTL) to orthomosaics generated by UAV aerial photogrammetry, distances and cadastral themes can be calculated; as long as the pixel size and terrain characteristics are not exceeded.

Keywords : Cartographic projection; Universal Transverse Mercator Projection; Local Topographic Plane; Topographic horizontal distance.