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Abstract

Interpolation processing of digital map imagery data is carried out by prefetching full and half resolution data stored in half-resolution addresses of scene memory into a cache and accessing the cache as virtual addresses associated with the interlaced scan of the display are generated. Both full and half-resolution data is controllably weighted and summed bi-linearly to obtain interpolated data values for spatial locations corresponding to the virtual addresses. For a respective half-resolution storage location, stored imagery data includes both half-resolution data, (such as that representative of color characteristics, elevation, cultural features, linear and area features) of its associated half-resolution spatial location in a terrain map and a plurality of full-resolution data for a plurality of full-resolution spatial locations of the terrain map that are located in a adjacent neighborhood surrounding the half-resolution spatial location.

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First Claim