A SEMIAUTOMATIC APPROACH FOR GENERATION OF SITE MODELS FROM CARTOSAT-2 MULTIVIEW IMAGES
Article, Other literature type
Sudheer Reddy, D.
Subramanyam, P. S.
Das, B. K.
Radhadevi, P. V.
- Publisher: Copernicus Publications
(issn: 2194-9034, eissn: 2194-9034)
TA1-2040 | T | TA1501-1820 | Applied optics. Photonics | Engineering (General). Civil engineering (General) | Technology
In the last decade there has been a paradigm shift in creating, viewing and utilizing geospatial data for planning, navigation and
traffic management of urban areas. Realistic, three-dimensional information is preferred over conventional two dimensional maps.
The paper describes objectives, methodology and results of an operational system being developed for generation of site model from
Cartosat-2 multiview images. The system is designed to work in operational mode with varying level of manual interactivity. A
rigorous physical sensor model based on collinearity condition models the "step n stare" mode of image acquisition of the satellite.
The relative orientation of the overlapping images is achieved using coplanarity condition and conjugate points. A procedure is
developed to perform digitization in mono and stereo modes. A technique for refining manually digitized boundaries is developed.
The conjugate points are generated by establishing a correspondence between the points obtained on refined edges to analogous
points on the images obtained with view angles ±26 deg. It is achieved through geometrically constrained image matching method.
The results are shown for a portion of multi-view images of Washington City obtained from Cartosat-2. The scheme is generic to
accept very high resolution stereo images from other satellites as input.