EXPLORING DIFFERENCES BETWEEN JAPAN GEODETICn DATUM 2000 AND WORLD GEODETIC SYSTEM 1984 THROUGH IMAGE COORDINATE AND EXTERIOR ORIENTATION PARAMETERS

摘要

Imagery has been one of the easily accessible sources to extract spatial data. The exposure center, image points, and ground points become a prime combination to retrieve spatial information. Mentioning photogrammetry and computer vision, separated coordinate systems define their own spaces to demonstrate spatial information. A similar situation is pointing to different geodetic systems, such as world geodetic system 1984 and local datum, used in surveys. Since GPS and INS can record exterior orientation parameters when collecting aerial imagery, they boots up the capacity of spatial data processing as well as applications. However, there are variable local geodetic frames developing for regional usages, and they must be integrated in order to present the geo-information in a united coordinate frame. When it comes to an image plan, the center is assigned as the original point, and then constructs a Cassette coordinate system to interpret image coordinates. This widely used expression is consistent, so that mathematical models can be performed in every geodetic system. Hence, this paper is aim to explore the differences between a local geodetic system the Japan geodetic datum 2000 and WGS 84 via camera's exterior orientation parameters. In addition, the two sets of exterior orientations are compared to each other, and being observed for their relationships. The results indicate that although the both coordinate systems are constructed on the same terrestrial frames, their definitions toward the axis and rotations are different. Therefore, it needs to properly unify discrete geo-spaces in order to demonstrate spatial information and related applications.