Airborne thermal infrared data

Multispectral thermal infrared imagery was acquired with a Telops camera equipped with a filter wheel in 5 spectral bands. The data delivered are the brightness temperature at sensor level, the radiance at sensor level and the Land Surface Temperature (LST).

The camera calibration was achieved in lab and controlled during the flight by comparison with ground measurements.
Due to variations of the filter wheel temperature during data acquisition, a post processing correction was applied based on the wheel temperature recorded during the flight and wheel
caracteristation data acquired in a controled environement (lab).
Ortho-rectification was achieved thanks to DEM provided by RGE ALTI 1m database of IGN.
LST retrieval was carried out by first estimating the bottom of atmosphere (BOA) radiance using COMANCHE and then applying the TES method (MMD law trained on ECOSTRESS spectral library)

The spectral response function for each band was measured in lab for the whole optical system, including sensors and lenses.

Camera caracteristics:
- Swath: 593 x 472 m
- Ground Sample Distance: 1.95 m
- Spectral bands (band width and equivalent wavelength):
* Band 1 : 8.1-8.9 (8.55) microns
* Band 3 : 8.7-9.9 (9.10) microns
* Band 4 : 10.5 - 12.9 (11.74) microns
* Band 5 : 6 - 14 (9.72) microns (broadband)
* Band 8 : 10 - 11.5 (10.73) microns