I was wondering this too, the author added this info via a reply in the comments (of his site/article , not HN)- > Author here. The camera was a Seek RevealPr

I was wondering this too, the author added this info via a reply in the comments (of his site/article , not HN)- > Author here. The camera was a Seek RevealPro which has 320x240 resolution. The thermal data in the panoramas are stitched together from raw data exported by the camera and represented as color (hue+saturation, as per scale in upper right, represents temperature data). The brightness channel is piecewise-linearly combined with a corresponding visual image taken with a regular SLR to provide a visual reference of what you're looking at.