What I was saying is if the operator chooses the wrong view the people won’t ‘pop’ the way they will with the correct view so they won’t stand out if you’re looking at it wrong.
The point being, to make them “pop”?
Nah. So far, the Canadians seem to be keeping to their side of the border. I am in the LP, though. The yoopers might be overrun for all I know.
I’m actually only about twenty minutes from where those Mensans came up with that brilliant “plan”.
visually on the screen. Depending upon the model of FLIR used, there are different modes that can be used, including:
- White Hot displays warmer objects in white and cooler objects in black.
- Black Hot is the inverted version of White Hot, displaying warmer objects as black and cooler objects as white.
Today, in the middle of frigid winter temps, you would be warmer than the surrounding background; wait six or seven months until a July/August heatwave & you’ll be cooler than the surrounding area. A different FLIR view will make your target stand out better based on the person vs. the background temps. If you’re looking for something whether a person or a deer or whatever you may be hunting in tree cover / underbrush you may miss them in one view but they’ll stand out in a different view. Thermal pallet colors & images to see the differences.
ETA: that deer is a closeup, but what if you’re using a drone 200’ up to search for a missing person that may or may not be in your search area? That deer is more visible in the isotherm than the black hot.
I worked as a manufacturing engineer for FLIR (the company) making commercial FLIR cameras and you are correct. The user would probably be futzing around with various modes in actual use.
In the same vein. You can use a FLIR camera to tell the water level in a big water tank, most of the time. The part of the tank that is filled with water will change temperature much more slowly than the part that is empty. Sometimes it is colder other times it is warmer but there will be a short part of the day when they will reach equilibrium and you can’t tell.
Here is an anecdote. We were meeting with a German car manufacturer and were explaining that to them. The cameras going into cars were more midrange and the user would not have the option to change modes like that. We told them that people would look black or white depending on the weather. He didn’t like that and wanted more consistency. We kept explaining that that couldn’t be done. At one point he got frustrated and in a thick German accent said, “All people must be white!”
Did he click his heels and give you the salute? 
Haha. He didn’t realize of course but it was a running joke for a while. I worked there for fifteen years on commercial products. When I started only municipalities and the very wealthy could afford them. Now they are cheapish on Amazon.
The difference between one person and ten people would be pretty obvious to anyone who’s walked in new snow a lot. The difference between 100 and 1000 would be less apparent as the snow on the path gets trod down.
Could you use one to measure the level of propane in a tank?
Propane has a higher heat capacity than air (but not nearly as much as water) so you could. When the tank is flowing you’re lowering the pressure which decreases the temperature which would make it easier. At least I think that’s the case. I’m happy to be corrected.
I recall that in Palm Sunday Kurt Vonnegut wrote that when he was captured by the Germans during the Battle of the Bulge he and his comrades were amazed at the German’s white winter gear while the Germans were amazed at the dumb Americans fighting in the snow with their standard olive drab.
I was in a meeting with the CEO of an Austrian company trying to architect a chip for their product. He kept referring to our chip as the “final solution”. A running joke until we abandoned the project.
I knew of a McDonalds franchisee in northern Canada - the local natural gas supplier was a monopoly and expensive, so he arranged for a giant propane tank (about 12 feer by 6 feet diameter) to sit in the lot behind his restaurant, and a truckload a week. Come winter in the north, and temperatures closing in on -40, and they found they had to put electric heat blankets on the tank to maintain pressure.
Well, before getting too cocky, remember the Germans had problems providing their soldiers with winter clothing of any kind, much less having it in winter white during their own first winter campaign of the war during the Russian winter 1941/42. Even vehicle winter camouflage relied heavily on improvisation as the only feasible option.
The necessity of a camouflage colour for winter campaigns had been realised on German side in 1941. The A.H.M. 1941, Blatt 29 from 21st November 1941,No. 1128 (O.K.H. (Ch H Rüst u. BdE), 18th November 1941 - 72/88/16 - AHA/In 2 (VIII)) regulated the painting of the equipment during winter. White, washable colour according to the modified technical delivery conditions 6345 could be requested on the official routine. If this colour arrived at the front troops in sufficient quantities in the winter 1941/42, is doubtful. The troops had to improvise like so often. All available methods had to be used. The vehicles were camouflaged with white colour, whitewash, chalk and sometimes they were covered with white sheets or white curtains.
I used to have a magnetic plate temperature thing for my propane tank. One of the ones that changes colour based on temperature. You’d stick it on the side of the tank, and where the colour changed, that was where the level of the propane was.
When we had a propane stove at the cottage, my dad would periodically pour a kettle of hot water on the propane tank. Clearly showed where the fuel line was.
Every year in Wisconsin The Blaze Orange Army assembles. 550,000 to 600,000 deer licenses sold. Now sure, not a one of them is covering their tracks when out in the forrest, but they are dedicated enough to dowse themselves in deer piss. Above all they are not merely enduring snow and cold, they are HUNTING in it and if organized would represent the 8th or 9th largest army on the planet and fueled on nothing but strip clubs and Bud Lite.
Up here we are happy in our elements, thank you.