Digital cartographic system for geographical information processing
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United States of America Patent
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Aug 6, 1996
Issued Date -
N/A
app pub date -
Feb 28, 1995
filing date -
Apr 19, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
In a digital cartographic system for processing geographic information, a map projection of a map is converted. The map projection transformation is carried out with a coordinate value in which longitude and latitude are set to a center by way of a linear interpolation so as to simplify a calculation required for transforming the map projection, and also not depending upon a map projection to be converted. Also, after the transformation process operation, a reference line such as longitude/latitude and an equiangular line is superposition-displayed/overlapping-displayed in order to assist an analysis, in response to a demand. In accordance with the present invention, a map can be shown with correctness of a distance and correctness of azimuth by performing various sorts of map-projection transformation, the digital cartographic system can support an intuitive idea of a user, and also can improve an information representation function of this digital cartographic system.
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