Geometric Modeling for High Resolution Indian Remote Sensing Satellite Sensors

The entry of Cartosat and Resourcesat series in Indian Remote Sensing (IRS) satellites opened a new chapter in photogrammetric exploitation of High Resolution Satellite imagery. The DEMs generated from Cartosat-1 are already in the main stream for urban, rural and agricultural usage and Cartosat-2 imagery of 0.8 m resolution has the potential to be used for topographic map compilation. Resourcesat-1 and Resourcesat-2 satellites with multi-spatial and multi-spectral capabilities in a single platform are suitable for agricultural and thematic applications. Chandrayaan-1 was the first step towards outer space exploration and the DEMs generated from its Terrain Mapping Camera helps us to understand moon's topography and evolution. Processing of images acquired by different sensors provides a challenge for algorithmic redesign and required to improve many photogrammetric processing components especially sensor models. This paper provides an overview of different geometric considerations adopted for these sensors such as in-flight calibration, band to band registration, stagger correction, geo-integration and simultaneous rectification of imagery from different sensors of same payload.