Article: "Modified to Ground" MAPPING PROJECTIONS.

Typing projects to known datums with GPS provides better accuracy

We know that published mapping projections contain computable distortion, which is compensated by the varying scale factors throughout the zone. These mapping projections can be modified (scaled) to "ground" to obtain parity between positions determined by GPS and those distances measured with an EDM (Electronic Distance Measuring) instrument. Ground projections, however, are based on a single scale factor and are limited in geographical size. Determining the extent to which a modified to ground projection can he "pushed" is not a difficult task, being entirely dependent on the amount of error ...

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