eolab:thermal:start
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Table of Contents
Thermal Remote Sensing
Drone - DJI Mavic Enterprise 3 Thermal
Calibration Field Targets
- Prior to + after flight measure targets with handheld thermometer. Or place thermocouples + logger under panels!?
- 30×30 cm ?
- Emissivity measurement:
- High-emissivity
- Matte black-painted aluminum
- ε≈0.97
- Purpose: Temperature reference
- Coatings / Foils:
- Low-emissivity
- Polished aluminum sheet
- ε≈0.04-0.06
- Purpose: Reflected apparent temperature
IR Termometers
- Calibration:
Lab Temperature Calibration (potential field use?)
Research Papers
- WUR
Calibration + Processing - DJI Thermal Format Conversion
Code
💡 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
Leaf Temperature Measurement for Validation
- 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.
- Compute correction $ Ttrue = a * Tdrone + b $ using measured vs observed target temps.
- Apply correction to thermal mosaic.
- Validate canopy temps vs spot measurements.
eolab/thermal/start.1760448173.txt.gz · Last modified: 2025/10/14 15:22 by moritz