In scenario 4, where seven GCPs were used in the processing chain, Agisoft Metashape and Pix4dmapper demonstrated the best accuracy, with radial RMSEs of 0.038 m and 0.06 m, respectively, and vertical RMSEs of 0.05 m and 0.061 m, respectively.
Pix4dmapper gcp elevation software#
This is something that our Product Development team will consider for future version of the software. The horizontal and vertical accuracies were improved for both software packages. In the future, we want to offer more options to our users: The user should be able to import a grid geoid file into Pix4Dmapper that will define the geoid altitudes for his/her area. The Ground Control app will only output in WGS84 Lat/Lon (+ your height based. Add/update elevations from terrain layer to GCPs. Select all GCPs and right click in the map view. Copy the initial ELEVATION value (in this case, the surveyed elevation from the field staff) to a new field called 'OBSERVED' 4. Right click GCP layer, calculate/copy attribute values. This does not work perfectly (as the curvature and scale issues will not be taken into account) but it is a good approximation (especially for small areas). Pix4Dmapper will import the GCPs (they can be measured in geographic or. Import GCPs & DSM into GM (From a txt or csv file). The software will give you the results in NAV88 (interpolating). So, indeed, if you add your GCPs with NAV88 altitudes, you can set the altitude as Arbitrary: the area climbs to 150’ or greater, a single flight does not allow for a successful result. If, for example, the flight is at 75 for high GSD, and. able to successfully output a clean file. Post processing by No GCP, Pix4D aerial triangulation checkpoint error statistics. When the highest altitude is double or greater than the lowest altitude, Pix4D will not be. If the geoid varies a lot (not a constant difference), then the only solution is to have GCPs with the desired altitudes (in your case NAV88 altitudes). The test area is a hilly area, with the highest elevation of 970m. (You need to know the difference between the NAV88 and a known ellipsoid - the one related to your horizontal coordinate system) I copy here the most important information:Ĭurrently Pix4Dmapper can do some altitude conversions for known geoids (egm84, egm96, egm2008)įor other geoids, we can only apply 1 constant difference (Geoid Height Above a known ellispoid):