High-precision DEM extraction by region segmentation-based progressive triangulation encryption filtering

With the progress of the times, the development of science and technology, the deepening of research in various fields, and the accuracy requirements for DEM are becoming higher and higher, and the DEM of satellite image interpretation has become more and more unable to meet the needs of research. UAV photogrammetry, as a new aerial survey and monitoring method, has the characteristics of high precision, low cost and fast renewal, which can make up for the shortcomings of traditional means in topographic survey. This paper takes the Wuyiling Nature Reserve as the research object, uses the UAV photogrammetry technology combined with the improved progressive triangular mesh filtering algorithm to extract the DEM, obtains the resolution 0.5 m terrain data, and evaluates it. The result verification shows that the precision DEM constructed by progressive triangulation encryption filtering based on region segmentation can display the terrain information more intensively; especially for high-vegetation area, high-resolution DEM can be generated to reflect the real surface condition.