Three-dimensional Line Mapping from Airborne Digital Photogrammetry for Detail Spatial Planning

Abstract

Government regulation mentioned that detail spatial planning has to use detailed map data, which mean detail thematic information with high accuracy in term of geometric aspect. Three-dimensional (3D) representation of city infrastructures needs to fulfil due to the spatial planning office application to organize their city, for example building permit purpose. This kind of data is very useful for another spatial analysis and application as well, such as smart city and digital twin. The utilization of digital technology to streamline a long-standing business workflow is an issue in various fields in recent years, including geospatial technology for city planning. Currently, the development of large format digital camera and photogrammetric workflow has experienced rapid progress. City infrastructures such as building, sewerages, roads, electricity poles, etc. is possible to be extracted accurately including their position, shape and dimension with this mapping technique. This paper presents the creation of high accuracy three-dimensional line map derived from digital photogrammetric workflow for Bandung City as a study area. This area has ramps characterized in the southern part and hilly terrain in the northern part where height discrepancies between those two areas is more than five hundred meters. It is a challenge to meet high accuracy spatial data for the whole areas with this condition. Validation of positional accuracy was carried out using hundreds pre-marking independent check points (ICP) including well identified geographic features as an addition. The result show that almost all city infrastructures on the terrain can be identified and positional accuracy in centimeter level can be obtained by this technique.