Technical characteristics of digital orthophoto image

Digital orthophoto map, the map framing, projection, accuracy and coordinate system are consistent with the same scale topographic map, and the image resolution is greater than 400dpi；; Output is greater than 250dpi. Because DOM is digital, it can be amplified locally on the computer, and it has good interpretation performance, measurement performance and management performance. DOM can be used as an independent background layer, combined with place name notes, map contour lines, kilometer grids and other elements to make various thematic maps.

It has the advantages of high precision, rich information, intuitive and realistic, and strong sense of reality. It can be used as background control information to evaluate the accuracy, authenticity and integrity of other data; Natural information and human information can be extracted from it, and new information and products can be derived, which provides good data and updating means for topographic map revision and updating.