Orthophoto generation using IKONOS imagery and high-resolution DEM. Integration of digital photogram
This project describes a workflow for the DEM extraction from unrectified satellite stereo scenes, its visualization and integration in GIS environment. The results obtained using a stereo scene acquired by Ikonos Imagery over Central Macedonia – North Greece are presented and commented.
The images are oriented with a rigorous photogrammetric model for CCD linear array sensors. The model estimates the sensor internal and external orientation with least squares adjustment, using a suitable number of ground control points.
For the DEM generation, the points are automatically extracted in the images at sub-pixel accuracy with a least squares matching algorithm and their 3D coordinates are then calculated with forward intersection using the external and internal parameters estimated during the image orientation. The produced terrain model is used for further environmental investigations.
