Abstract
Many megacities in China have a particular interest in detecting change, caused by construction, disaster etc., as soon as possible, on a media which allows quick and immediate processing, of a limited and small area, to an accuracy appropriate to data use and scale and within a modest budget. Topographical change detection projects using imagery obtained from low altitude UAV (Unmanned Aerial Vehicle) system and processed by newly developed software dedicated to the creation of quick and accurate DSM (Digital Surface Models) are being carried out in several large cities in China. This paper outlines the specific UAV system, with its hardware and the special wide field of view camera system as well as the software developed for the processing of this imagery. M-DSM method workflow and Technical route of employing UAV system to detect illegal buildings are provided.
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