KML file does not open: common causes on phone and in field work
When a KML file does not open, the problem may be file structure, KMZ packaging, coordinate order or excessive size.
Field takeaways
- KML is text based, KMZ is a compressed package.
- KML coordinate order is usually longitude, latitude, altitude.
- Very large KML files may be slow or fail on phones.
- Broken tags or invalid geometry can corrupt the file.
- MapLab Survey connects KML layers to field measurement and checks.
Check the file type
A file may look like KML because of its extension, but the content may be different or damaged. KMZ is a compressed package that can contain a KML file and sometimes icons or image resources. If the file extension changed during sharing, the phone may fail to open it.
Coordinate order
KML is commonly interpreted in WGS84 geographic coordinates, and coordinate order is usually longitude, latitude and altitude. If latitude and longitude are swapped, a point that belongs in Turkey can appear in a completely different location.
MapLab Survey workflow
- Add the KML as a separate layer in the project.
- Check whether points, lines and polygons appear where expected on the map.
- Split very large files or remove unnecessary geometry if the phone struggles.
- Do not mix parcel, measurement and photo layers.
- Use GeoJSON, DXF or CSV instead of KML when the delivery format requires it.
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 does KML not open on phone?
It may be corrupted, too large or incorrectly structured.
Are KML and KMZ the same?
No.
What is KML coordinate order?
Usually longitude, latitude, altitude.
Can MapLab Survey use KML?
Yes, as field layers and exports.
Technical references
The field guidance in this article is aligned with the technical and official references below.
Related: Open KML file · What is KMZ? · Share KML with WhatsApp · MapLab Survey