The production principle of digital orthographic image

Jul 19, 2023

Digital orthophoto map is the image data generated by using DEM to radiate, differential correct and Mosaic the digital aerial photo or remote sensing image after scanning processing, and cut according to the specified map range, with kilometer grid, map outline (inside and outside) decoration and notes.

Digital orthophoto map is different from the map we usually see, it is the real reflection of our ground information on the image map, it is not only there is no deformation, but also richer than the ordinary map, its readability is stronger.

Digital orthophoto can be used as background information, from which we can extract the necessary natural resources and social information, which provides a lot of useful basis for preventing natural disasters and planning public facilities.

The production principle of digital orthophoto is as follows: according to the characteristics of the orthophoto, after radiation correction and geometric correction of the original image by applying professional remote sensing software of geographic information, various deformities and displacement errors can be eliminated, so as to obtain more accurate digital orthophoto maps of fine geography and various satellite remote sensing. 

The digital orthographic image is first matched into stereo image pairs according to the image texture, and then the digital elevation model is generated. Then, digital differentiation correction is performed on the synthesized pixels and orthophoto is generated.

This drawing method can guarantee the image quality and prolong the drawing cycle of the device, which requires high comprehensive quality of the operator.