DOM Acquisition Method and Production Process

May 04, 2023

The digital orthophoto map uses the digital elevation model (DEM) to perform projection difference correction and mosaic pixel by pixel on the scanned digital aerial photos or satellite image data collected at high altitude, and cuts according to the range of the national basic scale topographic map The resulting digital orthophoto dataset.

For aerial photos, use the full digital photography system to restore the photographic attitude during aerial photography, build a three-dimensional model, detect, edit and generate DEM in the system, and finally produce a DOM with high precision.

For satellite image data, existing DEM data can be used to generate DOM data through single-chip digital differential correction.

DOM has the advantages of high precision, rich information, intuitive and real, etc. It can be used as background control information to evaluate the accuracy, reality and integrity of other data; it can aggregate natural resources and social development information from it, and provide disaster prevention and public facility construction planning, etc. Provide a reliable basis; new information can also be extracted and derived from it to realize map revision and update.

In the field of urban surveying and mapping, DOM is widely used in many aspects such as urban planning and design, transportation planning and design, urban green coverage survey, urban built-up area development survey, scenic spot planning, urban development and ecological environment survey, and sustainable development research. significant social and economic benefits.