Best Thermal Imaging For Large Scale Monitoring?

[Superwake]

We have a pilot project coming up with the BC Fire Dept. to detect and monitor forest fires. We will be flying approximately 15000 acres a day. Our altitude will range from about 200 m to 500 m above ground cruising at 20 knots. For our RGB camera we are fairly set on the Sony RX1R ii 42 MP, but not 100% certain what thermal imaging solution to use. We have been looking at the FLIR BOSON 640 LWIR. Do you fellows have any suggestions? The max payload we can carry is about 2 kg total.