How to measure land with Google Earth, KML and field checks
Google Earth is useful for visual checking, but imagery on screen is not the same as an official or centimetre-level survey.
Field takeaways
- Google Earth is strong for visual review and KML sharing, not legal surveying.
- KML is interpreted in WGS84 geographic coordinates.
- Area results depend on drawing quality, imagery and CRS handling.
- MapLab Survey turns KML into a field layer with notes, photos and exports.
- For delivery, keep CRS and control notes with the KML.
What is actually being measured
Drawing a polygon in Google Earth measures the image, not surveyed ground. If that image is shifted or three years old, the area inherits the error without warning.
Check the imagery date
The capture date is displayed and older imagery can be browsed. A boundary drawn on a three-year-old image may ignore a new road or building.
The right workflow
Estimate in Google Earth, export the KML, open it in the field as a reference layer and compare with what is on the ground. That is where the surprises appear.
When not to use it
For official boundaries, stake-out, or any figure entering a contract, start from a field measurement.
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
Is Google Earth land measurement official?
No. It is a visual and preliminary tool.
Can MapLab Survey open Google Earth KML?
Yes, as a reference layer.
Is Google Earth area accurate?
It can be useful for rough checks, not controlled survey delivery.
Why can KML look shifted?
CRS handling, imagery age and phone GPS error may cause offsets.
Technical references
The field guidance in this article is aligned with the technical and official references below.
Related: Open KML file · Create KML file · How land measurement works · MapLab Survey