This extension is based on a previous ESRI “Projector!” sample script, but uses the EPSG data set and, additionally, can perform DATUM transformations (DATUM shifts), on the same package.
This extension performs the following operations:
· Projection – converts a geographic coordinate theme (Latitude/Longitude, Decimal degrees) to a “flat” or plane theme, with X/Y coordinates in linear units (meters);
· DATUM transformation – converts a geographic coordinate theme based on a specific geodetic DATUM and using an ellipsoidal (including spherical) model of the earth, to another theme based on another DATUM; sometimes referred as “DATUM shift”;
· Unprojection – this is the reverse operation of Projection defined above – converts a plane X/Y coordinate theme to a geographic one;
· Reprojection – this operation converts a projected theme to another projected theme, and may include a DATUM transformation and a change of projection parameters.
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