Patent ID: 6868421

Claim:
A method of converting geospatial database into compressive database, comprising the steps of: (a) partitioning two or more dimensional geodetic coordinates of an original geospatial database into a plurality of data segments, wherein each of said data segments is at least partially displayed within a display area of a physical display device according to at least a predetermined scaling factor; (b) selecting a specific point position in each of said data segments as a reference point position (RPP) for each of said respective data segments, and then forming a set of reference point positions (RPPs) for said original geospatial database; (c) providing a coordinate origin point for each of said data segments by using said reference point position (RPP) of each of said data segments as said coordinate origin point; (d) converting said two or more dimensional geodetic coordinates of said original geospatial database within each of said data segments into corresponding local coordinates, each of which has a local position relationship with respect to said original coordinate of said respective data segment, so as to form a local coordinate system for each of said data segments; and (e) converting said set of reference point positions and said local geodetic coordinates of each of said data segments into pixel coordinates in form of a pixel coordinate system to form a specific digital map database.