TITLE: UAV - Digital elevation model from Miellejohka Alpine, north-western Sweden.
SITES STATION: Abisko Scientific Research Station
TIMESTAMP: 2018-07-28 13:30:00 - 2018-07-28 14:30:00
TIME ZONE: UTC +1 
LATITUDE: 68.313244 
LONGITUDE: 18.917145
ALTITUDE: 700.2 m.a.s.l. 
FILE RETRIVED FROM: https://data.fieldsites.se Link to metadata landing page is available in separate file in the downloaded zip.
DATA POLICY: SITES data is licensed under a Creative Commons Attribution 4.0 international license (http://creativecommons.org/licenses/by/4.0/).

PARAMETERS & UNITS: Elevation (meters)

DESCRIPTION: 
Near-ground digital elevation model (DEM) generated from a UAV platform, with a RGB camera. Pixel resolution is 3.56 cm. 
The ecosystem surveyed is a heathland located south of lake Tornetrsk. The vegetation in the area consists mainly of Betula nana, Empetrum nigrum subsp. hermaphroditum, and Vaccinium vitis-idaea.
The survey area is a polygon defined by the coordinates (GCS WGS84, decimal degrees): 68.310510, 18.908795; 68.315968, 18.908864; 68.316037, 18.925319; 68.310490, 18.925512. 

FLIGHT PARAMETERS:
Nominally, 75% side and front overlap. 
Nominal flight height 60 m above ground surface.
Nominal flight speed 8 m/s.
Survey area was flown in two separate UAV flights (U01 and U02).

WEATHER CONDITIONS:
Light conditions during the flight were mainly sunny.
Average wind speed during flight was 0 - 2 m/s.
 
SENSOR DESCRIPTION:
Data acquired with a Canon PowerShot G9 X RGB camera, on board of a quadcopter UAV. 

GEOREFERENCING: 
No geometric correction has been performed (RMSE: 0.96 m). RMSE is exclusively dependent on UAV GPS system.
The DEM projection is SWEREF99_TM (EPSG:3006).

PROCESSING METHODS:
Digital Elevation Model processed using Metashape 1.6.2. 
Details about processing can be found in the report (SITES_U01-RGB_ANS_MJA_20180728.PDF).

PERMISSIONS:
This material has been inspected and approved for dissemination by Lantmteriet.