The concept of digital orthophoto image

DOM (Digital Orthophoto Map): It is a group of digital orthophoto images generated by digital differential correction and mosaic of aerial (or aerospace) photos and cropping according to a certain range of maps. It is an image with both geometric accuracy and image characteristics. & gt

DOM has the advantages of high precision, rich information, intuitive and realistic, fast access and so on. It can be used as background control information for map analysis, and can also extract historical information or latest information of natural resources and social and economic development, providing reliable basis for disaster prevention and public facilities construction planning. We can also extract and export new information from it to update the map. The accuracy, authenticity and completeness of other data are excellent. DOM.jpg Hefei Digital orthophotomap.

The technical characteristics of the map are: digital orthophoto, map framing, projection, accuracy and coordinate system are consistent with topographic maps of the same scale, and the image resolution is that the input is greater than 400dpi and the output is greater than 250dpi. Because DOM is digital, it can be developed and enlarged locally on the computer, and has good interpretation performance, measurement performance and management performance, such as issuing certificates with rural land, identifying the boundary ratio of parcels and digitizing their point coordinates, and land use investigation. DOM can be used as an independent background layer, and combined with place name annotation, coordinate annotation, longitude and latitude lines, map section kilometer grid, kilometer grid and other elements to make various thematic maps.