The maps are made with commercial grade GPS. Positioning is done with reference points on the ground and aerial photography with a drone. To improve relative accuracy ground measurements use reference points to be able to correct for drift over time, both over a period of months and, by measuring a reference point at the start and at the end of a measuring sequence, thus correcting for drift during the measuring sequence itself.
Aerial photos are made with a drone, operating at 100m or 50m. The individual photos are stiched together to form a photo of a large area, between 200 and 500 photos for a paddock. The stitched image is corrected for the map projection.
The projection of all maps and aerial photos is UTM Zone 51S on the WGS84 ellipsoid.
As a result, the estimated relative accuracy of the maps is about 5 meter.
The maps are in PDF format.