Hey Mark,
Thanks for the response. Yes, we collected thermal quite a bit, too. Okay, it is interesting that you converted the radiometric image to a TIFF. Thanks!
Towards temperature measurement accuracy, a trick we figured out to increase the accuracy is aluminum foil. I am not sure what sensor you use. If you are using an uncooled microbolometer (like a FLIR Tau 2, or Workswell), when used with a drone they can suffer from fair bit of thermal drift. Typically, these sensors are black. As they are black, they can absorb a significant amount of solar heat energy during the flight. As the sensor is measuring emissivity and works via a relation between electric resistance and temperature - this can muddy the relationship that is used for radiant temperature estimation. By using HVAC aluminum foil, we were able to significantly, reduce the error in the radiant temperature measurements. This is super nerdy, but I figure folk here may have use for it. The paper that details this is below; it is open source - the story is in the figures, really.
Thanks again for the response!
*a
https://doi.org/10.3390/rs14246356 (Limiting External Absorptivity of UAV-Based Uncooled Thermal Infrared Sensors Increases Water Temperature Measurement Accuracy, O'Sullivan and Kurylyk, 2022)