Survey Coordinate Checker
Check whether two sets of map coordinates describe the same places. Measure the gaps and flag points beyond your chosen limit.
How can I check whether projected and geographic coordinates agree?
Provide easting, northing, longitude and latitude columns in a CSV, then choose the projected coordinate system and tolerance in metres. The report shows expected projected values, converted geographic values, coordinate deltas and separation. A small mismatch checks consistency; it does not establish the accuracy of the original observations.
Make sense of your geography.
Local files, clear maps and portable results.
Source and conversion settings
Loading your map…
Your features
0 of 0 features| Feature | Geometry |
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No matching features. Open data, add a point or clear your filters.
The table shows five attribute columns at a time. Select a feature for all properties. Search filters the table; export selections below control downloads.
Export fields and geometry
0 features · 0 fields selected. GeoJSON retains geometry and IDs; CSV contains attributes and geometry types.
The local background has country outlines, without street detail. Map segments are drawn in longitude/latitude space; routes crossing ±180° can appear across the map. Measurement calculations follow spherical geometry. Save your dataset before leaving.
Three simple steps
How to use Survey Coordinate Checker
Open a local file or load the example.
Inspect the map, choose features and adjust the relevant options.
Download the result and keep the original source file.
Common questions
Good to know
Understand the result.
Keep the original.
Is this tool free, and are my files uploaded?
This tool is free with no account required. The work happens in your browser. Your input and files are not sent to a processing server.
What are the limits and details?
All processing stays on this device. The bundled country outlines are a small-scale reference with no street detail. Coordinates use longitude, latitude order. Local files preserve your work; automatic cloud storage is not included.
Limits: 2,000 features, 40,000 coordinates, 100 distinct attribute fields and 5 MB of GeoJSON. Conversions run in a cancellable browser worker.