UAV survey DEM/orthomosaic of Storflaket, Sweden

On 20 August 2024, we performed an opportunistic drone survey of the "Storflaket" mire near Abisko, Sweden. Most images are from about a 100 m altitude AGL, taken with a DJI Mavic 2 Pro UAV. The survey consists of 417 images in total, spanning three sub-survey parts:

1. Nadir survey rows at ~100 m height
2. Close-up rows at ~30 m height near a hydrological experiment set-up
3. Oblique (~45 degree) inward-facing orbit around the survey for an improved network geometry (James et al., 2017)

Processing

We processed the data in Agisoft Metashape 2.0.2 using mostly default settings; see the file survey_metashape_report.pdf for more information.

Georeferencing was done by identifying remote Ground Control Points (GCPs) using the latest NIR orthomosaic (0.5 m/px) and lidar DEM (2 m/px) by Lantmäteriet (https://zeus.slu.se/get; accessed 24 January 2025). For distribution limitation reasons, these data are not in this repository.

A barebones Metashape project, only containing the GCPs, tie points, camera calibration and alignment, is supplied (metashape_project.zip) which should allow full reproducibility of the DEM and orthomosaic. The images required for reproducibility are provided in a zipfile (images.zip).

Output data

The output data are one DEM (storflaket_dem.tif) and one orthomosaic (storflaket_ortho.tif) in 5 cm/px resolution in the SWEREF99TM (epsg:3006) coordinate system, and the same vertical coordinate system as the reference DEM from Lantmäteriet.

Citation

Please cite the data as directly suggested by Zenodo and your bibliography manager software of choice.