thermal mapping initial processing is distorted

Hello. I want thermal mapping, so i tried alternative calibration at initial processing. But i failed alternative calibration. Only 5% photo was successed alternative calibration.

After this, I tried standard calibration. Then, this result came out.

Camera : Vue Pro R 9mm

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Most are flat, but there are slightly higher parts depending on the location.
I tried in various ways for a long time, but I couldn’t get the desired results.

Thanks.