US State Plane Coordinate System Hub

The definitive directory for regional Geodetic Surveying and Civil Engineering coordinate tools. Select a state to access specific SPCS zone converters, datum accuracy guides, and professional liability resources.

California SPCS

Zones 1-6 (Lambert Conformal Conic). NAD83 and CCS83 standard transformations.

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Texas SPCS

North, North Central, Central, South Central, and South zones. US Survey Feet support.

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New York SPCS

East, Central, West, and Long Island zones. High-precision datum compliance.

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Florida SPCS

North, East, and West zones. Critical for coastal surveying and FEMA compliance.

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Illinois SPCS

East and West zones (Transverse Mercator). Standard for Midwest civil engineering.

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Colorado SPCS

North, Central, and South zones. Essential for Rocky Mountain precision surveying.

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Washington SPCS

North and South zones. PNW geodetic authority for NAD83 transformations.

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Pennsylvania SPCS

North and South zones. Legal standard for PA boundaries and infrastructure.

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Ohio SPCS

North and South zones (Lambert Conformal Conic). Accurate regional grids.

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Virginia SPCS

North and South zones. Critical for Mid-Atlantic professional surveyors.

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Georgia SPCS

East and West zones (Transverse Mercator). Standard for Southeast geomatics.

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Why Use SPCS Instead of UTM?

While Universal Transverse Mercator (UTM) provides a worldwide grid, the **State Plane Coordinate System (SPCS)** is designed for significantly higher precision at the regional level. SPCS zones minimize scale distortion to better than 1 part in 10,000, compared to the 1 in 2,500 typical in UTM. For boundary surveys, utility infrastructure, and professional engineering, SPCS is the required legal standard across most of the United States.

Learn about Accuracy Differences → View Geodetic Standards →

What's Your Next Step?

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Warning: Verify Your Calculation

Coordinate accuracy varies by device and datum. Do not use these results for legal or construction purposes without checking:

GPS Accuracy Alert

Your phone's GPS can be off by 30 meters. This can cause critical errors in your data.

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Datum Shift Risk

Using the wrong coordinate system (e.g. WGS84 vs NAD83) creates a permanent 1-meter offset.

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