Study on generation of DTM using SPOT stereo data (II)
Kim Eui-Hong, Sohn Duk-Jae
Systems Engineering Research Institute
Korea Institute of Science and Technology
P. O. Box 1, Yoosung, Daejon, Korea
Abstract
Published topographic map could not be updated for a long term, nevertheless air-photo can not be acquired on the large area. Whereas remotely sensed data such as SPOT stereo imagery are very much useful for updating the map of large area. A software of bundle adjustment algorithm for DTM generation has been developed and exferior orientation parameters of satellite imagery has been programmed as function of time, and being tested using SPOT stereo data. DTM could be generated by pure computerization using satellite stereo data, offering the possibility of construction the data base of DTM of the whole Korean land. This paper introduces the schemes of generation of DTM using SPOT stereo digital data. The accuracy could be raised by testing procedure of the software and input data refinement for DTM generation.
Introduction
The Digital Terrain Model (DTM) data usually have been acquired from existing topographic maps, from aerial photogrammetry, or from ground surveys, etc. Map scanning is the most generally used method, but it may have the missing of present circumstances. Ground survey provides the most accurate information, but it is not suitable for large area. Aerial photogrammetry is the most convenient and fast to get the information at present, but also have the restrictions of cost expensive and not being able to get the information for the inaccessible region. So there have been strong demands for satellite remote sensing techniques and systems of sufficient accuracy to get the topographic information at the present time including inaccessible regions.
SPOT is one of the break throughs in the field of satellite cartography and have a lot of potentials to be developed. Many of eh authors have studied the possibility of base map revisions and the accuracy of ground coordinate determinations (Rivereau, 1987 ; Konecny et al., 1987; IGN, 1988; Lee Deren et al. 1988 ; etc) and they conclude SPOT image is suitable for map revision or cartography at scale of 1:50,000 to 1:100,000.
SERI/KIST ( Systems Engineering Research Institute/Korea Institute of Science and Technology) have been developing the software for DTM generation using SPOT Stereo digital data to construct the DTM data base for all over the area of Korean land.
The software consists of coordinate transformation, image matching, image orientation and ground coordinate computation. and interpolation routines.
This paper introduces the schemes of generation of DTM using SPOT digital data now developed or under developing.
