About the Coordinate Transformation Helper Online Free Tool

The Coordinate Transformation Helper Online Free Tool applies a simple 2D translation, rotation, and scale transform in forward or reverse direction.

How to Use the Coordinate Transformation Helper Online

1. Select local-to-global or global-to-local mode.
2. Enter X/Y coordinates plus translation, rotation, and scale ppm.
3. Run the helper to review transformed X and Y.

Choosing Options Correctly

This is a simple 2D transformation. It does not replace a full datum transformation, projection conversion, geoid model, or least-squares-derived control network adjustment.

Common Use Cases

• Apply a local site coordinate transform.
• Test rotation and scale assumptions.
• Convert a small coordinate sample during planning.

Quick FAQ

What is scale ppm?
Parts per million scale adjustment, where 10 ppm is 0.000010 as a factor.

Does this convert latitude and longitude?
No. It works on planar X/Y values. Use CRS tools for geodetic datum transformations.

What should I verify before transforming?
Confirm units, rotation direction, origin, scale, and whether coordinates are east/north or x/y.

How do I know the transformation is good?
Check transformed coordinates against known control points, not only against a single test point.