Digital cartographic system for geographical information process

Details Digital cartographic system for geographical information process Digital cartographic system for geographical information process

1995-02-28

1996-08-06

McElheny, Jr., Donald E.

Boots, shoes, and leggings

G06F 1900

Patent

active

055440525

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.

REFERENCES:
patent: 4283763 (1981-08-01), Bylinsky et al.
patent: 4873513 (1989-10-01), Soults et al.
patent: 4899293 (1990-02-01), Dawson et al.
patent: 4972319 (1990-11-01), Delorme
Journal of the British Astronomical Association, "Mapping Mars from Mariner Pictures", C. A. Cross, Apr. 1972, UK vol. 82, N.R.

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