Technical route of data processing related to digital orthographic image

Aug 31, 2023

DOM is generated and formed to realize differential correction of image deviation, interpolate the image in the bilinear with the pixel size of 0.1m according to the partition region, or collect the image again in the interpolation method within the cubic convolution, and then generate and form the subregion orthoprojective image. After that, the Mosaic line is actively generated and formed, thus launching the overall measurement area mode to carry out seamless connection. The DOM side projection of middle and high-rise buildings is not good, resulting in the formation of inverted image of the side. After that, the left and right pieces can be effectively replaced to create positive projective image to supplement, and finally ensure the seamless side connection of tall buildings and finally achieve digital positive image. Then the orthophoto view the correction and supplement, and it should be checked as soon as possible to see whether the orthophoto formed can be distorted or changed, especially the house and Bridges and roads, and whether there is an elongated room Angle and the double shadow phenomenon of houses and Bridges. The focus of image color equalization is to ensure the same and average color of orthophoto images after Mosaic. Assuming that color differences are presented in aerial photography, strict error correction should be implemented for the orthophoto images generated and formed, including single image color correction or multi-influence color balance. The digital orthophoto surrounding the orthophoto Mosaic should be accurately matched in the space and its geometry, and the visual view should be implemented to ensure that the ground characteristics of the surrounding digital orthophoto most image do not deviate. After that, adequate use of Mosaic lines to prevent deviation and dislocation due to elevation characteristics, while ensuring the integrity of the feature.

DOM check

DOM check requires sufficient use of air triangle encryption and security points to closely view the DOM, assuming that the plane of the same name is very different, you must check the cause as soon as possible, and start again as soon as possible. The edge limit difference of the Mosaic position of the surrounding DOM image is determined by visual analysis that there can be no obvious edge trace, which does not need to be greater than four pixels, so the seamless connection is implemented, and the reason for the edge exceeding the limit image must be identified as soon as possible and corrected as soon as possible. Orthophoto framing and cutting should be within GB/ 7930-87 framing criteria, and the coordinates of the four map outline points should be the cutting categories. Orthophoto quality control should adopt the visual inspection method, and carry out comprehensive inspection on the map surface to ensure that the orthophoto picture is clear, reduce contrast, and ensure uniform tone and DOM without loopholes.