Production technology of digital line drawing map

The original data mainly include field data collection, aerial photos, high-resolution satellite photos and topographic maps.

Production method:

1, digital photogrammetry, three-dimensional tracking stereo mapping. At present, domestic digital photogrammetry software VintuoZo system and JX-4C DPW system have corresponding vector graph systems, with high accuracy. Among them, VintuoZo system has workstation version and NT version, while JX-4C DPW system has only one NT version.

2. Analytical or computer-aided digital mapping. This method is to obtain DLG data by mapping aerial photos and high-resolution satellite photos on an analytical plotter or simulator. In this way, it is necessary to use graphic processing software such as GIS or CAD to edit the obtained data and finally produce the result data;

3. Scan the existing topographic map and vectorize its elements through human-computer interaction. At present, vectorization software, GIS and CAD software commonly used at home and abroad all use vectorization function to vectorize scanned images and then transmit them to corresponding systems.

4. Manually digitize the frame elements on the newly made digital orthophotomap. Tracking on the screen, you can use CAD or GIS and VirtuoZo software to insert the orthophoto map into the workspace according to a certain proportion, and then collect the corresponding elements on the map;