Mapping Recommendations
There are several recommendations we can provide to aid you in generating and evaluating maps with WingtraOne.
Original Data Quality
The quality of the data collected by WingtraOne is a very important element in obtaining an accurate map. Image quality, light condition, and flight path overlap are the
three factors which effect the most on the quality of the original data.
Image quality
High resolution images are essential to ensure a successful stitching (orthophoto generation). All of our cameras were thoroughly chosen to guarantee high quality
images. Especially for projects with high requirements, it is advisable to use the first-rate sensor RX1RII. For more details about our diverse range of sensor options,
check out our homepage.
Light condition
The default camera settings provided by us cover a large range of light conditions. Nevertheless, it is advisable to check the images after the first flight to make sure the
images are not underexposed or overexposed. The orthomosaic generation favors images with many distinctive features which are constant over all images. Therefore,
flying on a bright but cloudy day would be ideal to prevent shadowing. Shadows darken areas which reduce the visability of features. Additionally, it results in appearance
changes between images, as the position of the sun changes during the flight.
Overlap
The default overlap (front and side) parameters are set to 70%, which is a good compromise between stitching robustness and data volume. Increasing the overlaps
improves the stitching quality but at the same time the processing time, including geotagging, will increase as well. The side overlap is additionally linked to the flight
duration as the number of rows increases. On the other side, the front overlap is only affecting the number of images.
Geolocation accuracy
Flight imagery can be geotagged after the flight. More details about the coordinate system of the geotags can be found in the Image Postprocessing Software Chapter.
When flying with a WingtraOne without PPK the geotagging accuracy of single images is in the range of a few meters. When flying with a WingtraOne with PPK an
absolute geotagging accuracy down to 1 cm can be achieved. With both options, the resulting products have a high relative accuracy, which allows to measure lengths or
volumes accurately.
For projects, where high absolute accuracy is required, you can either use a WingtraOne PPK or you can add ground control points (GCPs). When flying with a
WingtraOne without PPK, we recommend to use at least 5 GCPs and 3 check points. Distinctive and stable features on the ground or additionally added marks can be
used. The points should be measured accurately and placed in order that each point is visible on multiple images. Most postprocessing software allow the import of GCP
coordinates and provide an interface to mark them in the images. Make sure to specify the coordinate system and height system correctly.
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