State Plane Coordinate System (SPCS) : Zone Map Projections (Especially for GATE-Geospatial 2022)

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History of the State Plane Coordinate System (In America)

A system devised in 1930s by the United States started building the State Plane Coordinate System (SPCS) to pinpoint any location with a high level of accuracy.

SPC uses a unique set of coordinates for each of the 50 states. This grid system uses either a transverse Mercator or Lambert՚s conformal conic projection.

Its original design was to provide a permanent record of land survey monument locations. Like UTM system, SPS uses two or more zones. Each zone has its own overlapping. Each zone has its own projection and coordinates grid that is measured in feet rather than meters.

To define a location using this system, you give the state name, the zone name and the easting and northing values in feet. The accuracy of SPC is four times more than UTM system.

SPCS Zone Map Projections

Depending on the size of the area, a state can have one or many zones each using its own map projection. For example, Hawaii has 5 zones and Maryland has only one SPCS zone.

Each SPCS zone uses a map projection based on its orientation. If the zone has a north-south orientation, it uses the Transverse Mercator projection. It cuts through the spheroid/ellipsoid along two small circles at a specific distance from a central Meridian.

Figure Shows Transverse Mercator Secant Tangent Cylinder Pro …

When the zone has an east-west shape, it most likely uses the Lambert Conformal Conic projection.

This Figure Shows Lambert Conformal Conic Projection

The map below shows a thematic map of all the projections that the State Plane Coordinate System uses.

This Image Shows State Plane Coordinate System Map Projectio …

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