Table of Contents
Thermal Remote Sensing
Drone - DJI Mavic Enterprise 3 Thermal
Calibration Field Targets
IR Termometers
Lab Temperature Calibration (potential field use?)
Research Papers
Software / Code
💡 IDEAS
Must do's for data acquisition
Leaf Temperature Measurement for Validation
Field Mission Sheet
Thermal Remote Sensing
Drone - DJI Mavic Enterprise 3 Thermal
https://enterprise.dji.com/de/mavic-3-enterprise
https://copterpro.de/shop/drohnen-komplettsets/djimavic3enterprise/
Calibration Field Targets
Prior to + after flight measure targets with handheld thermometer. Or place thermocouples + logger under panels!?
30×30 cm ?
Unknown emissivity measurement:
https://www.calex.co.uk/find-correct-emissivity-setting-infrared-temperature-sensor/
High-emissivity
Matte black-painted aluminum
ε≈0.97
Purpose: Temperature reference
Coatings / Foils:
https://www.nextel-coating.com/de/shop/artikel/nextel-velvet-coating-811-21-9218-schwarz
https://de.acktar.com/tiefschwarz-beschichtete-folien-filme-2/
Low-emissivity
Polished aluminum sheet
ε≈0.04-0.06
Purpose: Reflected apparent temperature
IR Termometers
https://www.conrad.com/en/p/fluke-566-ir-thermometer-display-thermometer-30-1-40-650-c-contact-measurement-122370.html
https://www.voelkner.de/products/542871/Fluke-568EX-Infrarot-Thermometer-Optik-501-40-800C-Kontaktmessung.html
https://www.reichelt.de/de/de/shop/produkt/infrarot-thermometer_568_ir_und_kontakt_-40_bis_800_c-110173
Calibration:
https://www.fluke.com/de-de/mehr-erfahren/blog/kalibrierung/infrared-thermometer-calibration
Lab Temperature Calibration (potential field use?)
https://www.conrad.de/de/p/voltcraft-irs-350-kalibrator-kalibriert-iso-2236161.html
https://www.messbar.de/kalibrierstrahler-optris-br400-fuer-waermebildkameras
https://www.messbar.de/Optris-BR20AR-Referenzstrahler
Research Papers
WUR
Calibration + Processing
https://www.sciencedirect.com/science/article/pii/S1569843224005405
https://www.sciencedirect.com/science/article/pii/S1569843224005405
https://www.mdpi.com/2072-4292/17/15/2746
DJI Thermal Format Conversion
https://www.mdpi.com/1424-8220/24/19/6267
https://www.sciencedirect.com/science/article/abs/pii/S1350449523001998
Software / Code
https://github.com/DanGeospatial/dji_m3t_rpeg_to_tif/
https://www.dji.com/de/downloads/softwares/dji-dtat3
https://www.dji.com/de/downloads/softwares/dji-thermal-sdk
https://github.com/SanNianYiSi/thermal_parser
https://docs.webodm.net/how-to/process-thermal-images/
https://webodm.net/thermaltools
💡 IDEAS
Use a Sous Vide (keeps temp stable) in a pot for experiment flights
Maybe two? one for low temp one high
Must do's for data acquisition
https://dl.djicdn.com/downloads/zenmuse_xt/en/sUAS_Radiometry_Technical_Note.pdf
Leaf Temperature Measurement for Validation
Example:
https://www.implexx.io/temperature/leaf-temperature-sensor/
Thermocouple on a clamp
Use thermocouple of IR-Thermometer
3D-Printed clamp:
https://www.printables.com/model/974751-clamp-print-in-place
Field Mission Sheet
Pre-Flight
Record air temperature, relative humidity, wind speed.
Measure true temperature of high-emissivity target (IR thermometer or thermocouple).
Measure apparent temperature of low-emissivity target (reflected sky).
Set camera:
Emissivity = 0.98
Reflected temperature = from low-ε target
Atmospheric temp = air temp
RH = measured RH
Image type = radiometric JPEG/TIFF
In-Flight
Hover ~10 m for 30 s (thermal stabilization).
Capture targets at start of mission (low altitude, nadir view).
Fly survey (consistent height/speed).
Re-capture targets at end of mission.
Log times, environmental data.
Post-Flight Processing
Extract target pixel temperatures.
Apply correction to thermal mosaic.
Validate canopy temps vs spot measurements.