GB/T 15967-2024 in English

4.1 Preparation (Chapter 6)

The preparation includes data collection, analysis and formulation of technical design plans. It is necessary to ensure the integrity of image data and the conformity of aerial triangulation results, and to plan tasks in combination with the terrain features of the survey area. The technical design document should clearly define the technical indicators and quality requirements of each process.

4.2 Restore the stereo model (Chapter 7)

Restore the stereo model by importing the aerial triangulation results, using single model orientation and nuclear line resampling technology. Table 1 specifies the orientation accuracy requirements under different scales and terrain categories. The elevation residual must be within the allowable range to ensure the accuracy of subsequent mapping.

4.3 DSM production (Chapter 8)

The DSM generation method includes image matching, feature data collection and TIN construction. The key step is to construct TIN using feature points and lines, and to ensure the rationality of grid elevation through stereo model inspection and editing. Table 2 lists the editing requirements for different types of features in detail.

4.4 DEM Production (Chapter 9)

The DEM generation method is based on feature point and contour data, which needs to be processed by TIN interpolation and edited and checked. Table 3 specifies the elevation error requirements for different types of terrain to ensure that the DEM results meet the application requirements.