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Author Topic: Thermal orthomosaic calibration  (Read 678 times)

NMD

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Thermal orthomosaic calibration
« on: October 06, 2020, 12:11:13 AM »
I have thermal imagery from a radiometric Zenmuse XT. I am able to align the images in Metashape but I'm not sure how to calibrate the thermal values. While I understand that Metashape does not process R-JPEG, I can extract temperature data using FLIR tools and from a few ground-based sensors in each image. What would be the best way to calibrate the orthomosaic in Metashape? (Alternatively, would it be better to apply the calibration in ArcGIS Pro?)

DriesS

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Re: Thermal orthomosaic calibration
« Reply #1 on: October 08, 2020, 04:34:26 PM »
It's been a while since I've done some thermal ortho's, but we used to take .tiff images, and put a raster transformation on it with the raster calculator.

So the single input band (B1) is transformed in the raster calculator with "B1*0.04-273" as a base, then we would take measurements from flir tools and adjust the offset accordingly.

As I said, it's been a while since I've done this, but hopefully this gets you a little further.