Abstract: UAV tilt photography technology can quickly obtain abundant and comprehensive building texture, and plays an important role in the extraction of self-built housing. This research is based on the UAV tilt photography technology producing 3D real scene, which intuitively shows and extracts the self-built housings in Dongguan, as a results establishes a self-built housing database, so as to realize the "coordination and management of all self-built housing information like moves on a chessboard". By applying GIS, the scales, spatial distributions, building structures and population living habits of self-built housing are quantitatively obtained. The analysis displays that Dongguan has a large number of self-built housing, which occupies a lot of land resources, has potential safety hazards and carries a huge number of residents. The houses are clustered along old towns, urban trunk roads and rivers. This research can provide a reference for the government to formulate relevant policies.

Key words: 3D real scene, oblique photography technology, self-built housing, remote sensing interpretation, UAV