DEM Production Workflow

Digital Elevation Model (DEM) refers to a dataset that represents terrain relief using the elevation values of regular grid points. As fundamental geographical spatial data, DEM has extensive application value in the fields of Geographic Information Systems (GIS) and remote sensing, covering scenarios such as forest resource monitoring, urban spatial planning, aviation infrastructure construction, and military terrain analysis.

The DEM Production Workflow is primarily based on stereo image pairs, generating point cloud data through dense matching algorithms, and finally forming regularized data products through interpolation. The mosaicked output DEM data plays a crucial role in geographical applications involving multi-scene integration, continuous coverage, temporal consistency, or cross-region analysis, and is a key step in ensuring data spatial continuity and analytical integrity.

The workflow includes the following information descriptions:

  • Set Image Path (dsm/dem): Set information such as original image, reference image, and result data processing path.
  • Generate Connection Points: Automatically generate connection points in the image overlap areas, used for stitching and adjustment of multiple satellite images to ensure geometric consistency between images.
  • Generate Ground Control Points: Generate ground control points based on image feature points, used for high-precision geometric correction and position tracking to ensure the geographical location accuracy of images.
  • Block Network Adjustment: Based on connection points and ground control points, obtain the orientation parameters of satellite images through adjustment calculation.
  • Generate DSM: Generate point cloud data through dense matching algorithms and obtain DSM data through interpolation processing.
  • DSM Filtering: Perform filtering processing on DSM data to remove ground features such as surface buildings and vegetation.
  • Construct DEM Mosaic Lines: Automatically generate mosaic lines based on specified mosaic line construction methods. During mosaicking, overlap areas are selected according to the mosaic lines to ensure seamless and natural mosaicking results.
  • Output results (DSM/DEM): Merge and output DEM data.
Figure: DEM Production Workflow