TITLE: UAV - RGB orthomosaic from Svartberget forest, north-eastern Sweden.
SITES STATION: Svartberget Research Station
TIMESTAMP: 2022-07-18 10:41 - 2022-07-18 11:00
TIME ZONE: UTC +1
SAMPLING POINT: Centroid of location polygon - UAV Svartberget forest  
LATITUDE: 64.256788
LONGITUDE: 19.762648
ALTITUDE: 206.397 m a.s.l.

FILE RETRIVED FROM: https://data.fieldsites.se
DATA POLICY: SITES data is licensed under a Creative Commons Attribution 4.0 international license (http://creativecommons.org/licenses/by/4.0/).

PARAMETERS & UNITS: DN (-), H (m), V (m s-1), WS (m s-1)

DESCRIPTION: 
Near-ground RGB orthomosaic generated from a UAV platform, with a RGB camera. Nominal pixel resolution is 5 cm. 
The ecosystem surveyed is an experimental forest which covers 1076 ha of boreal forest land and governs a
manifold of research activities since 1923. It is situated on a slope in a 100 years old mixed forest with 
Scots pine Pinus sylvestris, Norway spruce Picea abies and birch Betula pendula.
The UAV flight covers an area which is defined by the following polygon coordinates (latitude, longitude in GCS WGS84, decimal degrees): 
64.256224, 19.757276; 64.258847, 19.758845; 64.258332, 19.763537; 64.258059, 19.763356; 64.257457, 19.767705; 64.254501, 
19.766211; 64.255340, 19.761546; 64.255818, 19.761778; 64.256224, 19.757276

FLIGHT PARAMETERS:
75% side and front overlap, nominally. 
Nominal flight height (H) 100 m above ground surface.
Nominal flight speed (V) 8 m s-1.

WEATHER CONDITIONS:
Light condition during the flight was complete cloud cover.
Average wind speed (WS) during flight was 0 - 2 m s-1.
 
SENSOR DESCRIPTION:
Data acquired with a Phantom 4 Multispectral (RGB) camera. 

GEOREFERENCING: 
No geometric correction performed. 
Geometric accuracy is based on UAV GPS (geometric model RMSE: 0.139 m).
The orthomosaic projection is SWEREF99_TM (EPSG:3006).

PROCESSING METHODS:
Orthomosaic processed using Metashape 1.6.2. 
Details about processing can be found in the Metashape report (SITES_UAV-RGB_SVB_SVB_20220718.PDF) which is available
within the downloaded .zip folder.

QUALITY CONTROL FLAGGING (QFLAG):
Quality flag value for the RGB flight is 112. First and second digit refers to the radiometric and geometric accuracy respectively while last one remaining 
refers to the presence or absence of visual artificats in the data if any. 
For detailed information about data quality flagging system used within SITES Spectral, refer to this document (SITES Spectral – Data Quality Flagging (QFLAG) Documentation; PID: https://meta.fieldsites.se/objects/yHjlJ9dsmPzMNAGPswfSlEtC)

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




