Raytheon Company

Christopher G Hoff

Erwin Ward Bathrick, Iii

An apparatus for map zooming includes instructions stored in a memory that when executed by a processor render a zoom bar. The zoom bar includes a plurality of map scale hash marks arranged along an axis of the zoom bar and indicative of a map scale range of a geographic map. The plurality of map scale hash marks include a first map scale hash mark representative of a first map scale, a second map scale hash mark offset along the zoom bar axis from the first map scale hash mark and representative of a second map scale, and a map transformation hash mark located between the first and second map scale hash marks and representative of a transformation of the geographic map from a first map data set defined with reference to the first map scale to a second map data set defined with reference to the second map scale. The zoom bar further includes a map zoom bar indicator located relative to the first and second map scale hash marks and corresponding to a current map display scale and a zoom level of the geographic map.

Apparatus and method for map zooming

A mapping application relies on a modified affine transformation algorithm to provide near real-time navigation of imagery, track-up capability and integration of segment and picture data. The affine transformation is modified to map a 'world space' comprised of a plurality of pixel maps onto a view port. The pixel data for the maps is preferably stored in vertical strips of memory to reduce the likelihood of cache misses. The mapping application is most useful for rendering pixel imagery on a platform with limited processing power, limited memory and small display sizes, e.g., 'hand held devices' such as a GPS handset, or Pocket PC.

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Huntington Beach, CA, United States of America

Christopher G Hoff