DOM Production Process

May 05, 2023

Relevant data needs to be collected before DOM is generated, that is, the data preparation stage, including original digital aerial photos, analytical aerial triangulation results, DEM results, etc.

After the data is ready, in the software, correct the L1 level image of each flight strip, obtain the single flight strip orthophoto image (L2 level image), and check whether the corrected orthophoto image is deformed, distorted, or ghosted , Blur and other problems, analyze the cause of the unsatisfactory area, and modify it repeatedly until a qualified image is generated.

Select samples based on experience. Samples require comprehensive feature elements and rich color saturation, generally including residential areas, roads, rivers, fields and other features. The application software, according to the samples, performs overall light uniformity and color uniformity on the corrected single airway image, so that the color tone of the orthophoto image in the whole area is consistent. For problems such as deformation, loss of ground objects, and uneven color transitions in the image, use software to repair the image.

After completing the above work, use the software to cut the DOM frame of the image results, and expand the coordinate system of the standard image frame according to the required scale by 20m when cutting. After framing and cropping, ensure that the grid coordinates of the first pixel in the upper left corner of each DOM are positioned at the pixel center, and the plane coordinate system value of the DOM grid should be an integer multiple of the pixel resolution.