Using Google Earth to calculate area of a tennis court
In order to test how accurate one can measure a field using Google Earth and EasyAcreage, it makes sense to measure a know area. In this case we chose a tennis court which we know has a dimension of 23.722 x 10.972 meters. It is easy to calculate that this should give us 260.8 square meters and a circumference of 69.488
The screenshot below show how I marked the tennis court in Google Earth. If you download the KML file that I used in my measurement, you can easily repeat the test yourself. Use this link to get the KML file : Wimbledon tennis court.kml
Measurement results:
| Expected | Measured | Error (%) | |
| Area | 260.8 square meters | 264.04 square meters | 1 % |
| Circumference distance | 69.488 meters | 69.8 meters | 0.4% |
Conclusion:
You can expect pretty good results, especially if the area that you wish to measure is displayed in good resolution on Google Earth. This should be more than good enough for the average farmer etc that just wish to know the approximate size of a piece of land. But I should stress that this method of measurement can not replace proper surveying methods, and in case of official issue or land disputes, it is always better to consult a proper surveyer to verify your measurements.
More Info
Please refer to the readme page to see how to download EasyAcreage.