Patent ID: 7242407

Claim:
A computer readable medium encoded with a computer program product for enabling a computer to re-project digital map images comprising: software instructions for enabling the computer to perform predetermined operations; and a computer readable medium bearing the software instructions; the predetermined operations including the steps of: receiving digital map data representative of a first map image in a first projection; determining a number of rectangular sub-images to divide the digital map data into, wherein the number of rectangular sub-images is based on the size of the rectangular sub-images; extracting each rectangular sub-image from the digital map data; computing the geographic coordinates of each corner of each rectangular sub-image from first planar coordinates; and computing second planar coordinates of each corner of each rectangular sub-image using a second projection equation; and supplying each rectangular sub-image and corresponding second planar coordinates to a texture mapping process for graphically mapping each rectangular sub-image into a second map image using a texture mapping graphical technique, wherein the computer re-projects map images.