Coordinate conversion app for WGS84, UTM, TUREF and ED50
Coordinate conversion is invisible in the field but expensive when wrong.
Field takeaways
- WGS84 is common for KML and latitude longitude.
- TUREF/TM matters in modern Türkiye workflows.
- ED50 still appears in old maps and archives.
- EPSG codes reduce ambiguity.
- MapLab Survey helps preserve CRS context.
Two things change, not one
A transformation can change the projection, the datum, or both. Converting latitude and longitude to UTM is a projection change; moving between WGS84 and a national datum shifts the ground position by metres.
Know the EPSG on both sides
Name the source and target systems by their EPSG codes. "UTM" alone is not a system: the zone and the datum are part of it.
Verify on a known point
Transform a point whose coordinates you know in both systems and compare. That single test catches almost every configuration mistake.
Keep the original
Store the untransformed data alongside the converted output, so a wrong parameter can be corrected without a return visit.
Try these steps on your own phone.
MapLab Survey handles RTK/GNSS point capture, drawing, area and volume calculations and coordinate conversion, then exports to DXF, KML/KMZ, GeoJSON, Shapefile, GeoPackage, NCZ or CSV. Capture, calculation and export work offline. Live NTRIP corrections and online basemaps need a connection.
Frequently asked questions
Why is conversion important?
Wrong conversion moves good measurements.
Is ED50 to TUREF a simple shift?
No.
What CRS does KML use?
WGS84 geographic coordinates.
Why use EPSG?
To reduce ambiguity.
Technical references
The field guidance in this article is aligned with the technical and official references below.
Related: TUREF, UTM, ITRF selection · ED50 to TUREF · Transformation report · MapLab Survey