METHOD OF EMBEDDING MAP FEATURE DATA INTO A RASTER GRAPHICS FILE

摘要

A method for providing map data composed of providing geospatial map data pre-rendered into a plurality of raster graphic files, where each of the raster graphic files comprising a plurality of image pixels each having pixel data information Additional map data is embedded into at least one of the raster graphic files by altepng the pixel data information The additional map data is then delivered simultaneously with the raster graphics files