Steps of orthophoto production

Описание: Complete steps are explained and listed in Aerial Triangulation, Automatic DTM Generation, and Interactive Editing Digital Orthophoto Production. Aerial Triangulation Preparation: Collect aerial photographs with overlapping coverage. Ground Control Points (GCPs): Establish GCPs on the ground to serve as reference points. Interior Orientation: Determine the camera's internal parameters (focal length, principal point, etc.). Exterior Orientation: Determine the camera's position and orientation at the time of each photo exposure. Relative Orientation: Align overlapping images to ensure they are correctly positioned relative to each other. Absolute Orientation: Use GCPs to align the images to real-world coordinates. Bundle adjustment: refine the positions and orientations of all images to minimize errors. Output: Generate a 3D coordinate dataset for further photogrammetric processing. Automatic DTM Generation Data Collection: Acquire high-resolution satellite or aerial images. Digital Surface Model (DSM) Generation: Create a DSM from stereo images or LiDAR data. Feature Extraction: Identify and extract bare-earth terrain features from the DSM. Filtering: Apply morphological or slope-based filtering to remove non-ground objects (buildings, vegetation, etc.). DTM Generation: Generate the DTM by interpolating the filtered elevation data. Quality Check: Validate the DTM against known elevation points or LiDAR data. Output: Produce a final DTM for use in various applications (e.g., mapping, planning). Interactive Editing in Digital Orthophoto Production Image Acquisition: Collect aerial or satellite images covering the area of interest. Orthorectification: Correct the images for geometric distortions caused by camera tilt and terrain relief. Mosaic Creation: Stitch the orthorectified images together to create a seamless ortho mosaic. Automatic Seamline Detection: Use algorithms to detect and correct seams between overlapping images. Interactive Editing: Manually adjust seamlines and correct any artifacts or misalignments. Radiometric Adjustment: Balance color, brightness, and contrast across the mosaic. Output: Produce a final high-quality orthophoto mosaic.