Thomas F Wescott

US Patent:

54758025, Dec 12, 1995

Filed:

May 12, 1994

Appl. No.:

8/243650

Inventors:

Thomas F. Wescott - San Diego CA
Lawrence E. McCleary - San Diego CA
David A. Nation - Hanover MD

Assignee:

United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G06F 314

US Classification:

395129

Abstract:

Signal transformations of inputted data brought about by 58 new subroutines in combination with other subroutines to display world maps or other display items with the unique capability of performing the following functions in complete generality. (1) Arbitrary selection of map center and coverage, including global displays, (2) filling of all land and lake areas defined by polygons composed of an arbitrary number of vertices, (3) clipping of map features and overlays at map boundaries and poles, (4) selection from any of nineteen currently implemented map projections with provision to install any other projection topologically similar to an oblique conic, (5) calculation of latitude/longitude for any point on a map without the need for inverse mapping equations, and (6) an efficient method of plotting polyline segments along great circles. These are a number of feature functions provided by this inventive concept. The software could potentially be used with any digital global geographic data base, such as World Data Bank II (WDBII), a geographic information system or other data base where polylines are used to depict linear and/or areal features.

US Patent:

53414632, Aug 23, 1994

Filed:

Jan 31, 1990

Appl. No.:

7/473258

Inventors:

Thomas F. Wescott - San Diego CA
Lawrence E. McCleary - San Diego CA
David A. Nation - Hanover MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G06F 314

US Classification:

395129

Abstract:

Signal transformations of inputted data brought about by 58 new subroutines in combination with other subroutines to display world maps or other display items with the unique capability of performing the following functions in complete generality. (1) Arbitrary selection of map center and coverage, including global displays, (2) filling of all land and lake areas defined by polygons composed of an arbitrary number of vertices, (3) clipping of map features and overlays at map boundaries and poles, (4) selection from any of nineteen currently implemented map projections with provision to install any other projection topologically similar to an oblique conic, (5) calculation of latitude/longitude for any point on a map without the need for inverse mapping equations, and (6) an efficient method of plotting polyline segments along great circles. These are a number of feature functions provided by this inventive concept. The software could potentially be used with any digital global geographic data base, such as World Data Bank II (WDBII), a geographic information system or other data base where polylines are used to depict linear and/or areal features.