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For reference (from Wiki): Night vision technologies Night vision technologies can be broadly divided into three main categories: image intensification, active illumination, and thermal imaging. Image intensification Main article: Image intensifier This magnifies the amount of received photons from various natural sources such as starlight or moonlight. Examples of such technologies include night glasses and low light cameras. In the military context, Image Intensifiers are often called "Low Light TV" since the video signal is often transmitted to a display within a control center. These are usually integrated into a sensor containing both visible and IR detectors and the streams are used independently or in fused mode, depending on the mission at hand's requirements The image intensifier is a vacuum-tube based device (photomultiplier tube) that can generate an image from a very small number of photons (such as the light from stars in the sky) so that a dimly lit scene can be viewed in real-time by the naked eye via visual output, or stored as data for later analysis. While many believe the light is "amplified," it is not. When light strikes a charged photocathode plate, electrons are emitted through a vacuum tube and strike the microchannel plate. This causes the image screen to illuminate with a picture in the same pattern as the light that strikes the photocathode and on a wavelength the human eye can see. This is much like a CRT television, but instead of color guns the photocathode does the emitting. The image is said to become "intensified" because the output visible light is brighter than the incoming light, and this effect directly relates to the difference in passive and active night vision goggles. Currently, the most popular image intensifier is the drop-in ANVIS module, though many other models and sizes are available at the market. Recently, the US Navy announced intentions to procure a dual-color variant of the ANVIS for use in the cockpit of airborne platforms. Active illumination Active illumination couples imaging intensification technology with an active source of illumination in the near infrared (NIR) or shortwave infrared (SWIR) band. Examples of such technologies include low light cameras. Active infrared night-vision combines infrared illumination of spectral range 700–1,000 nm (just below the visible spectrum of the human eye) with CCD cameras sensitive to this light. The resulting scene, which is apparently dark to a human observer, appears as a monochrome image on a normal display device. Because active infrared night-vision systems can incorporate illuminators that produce high levels of infrared light, the resulting images are typically higher resolution than other night-vision technologies. Active infrared night vision is now commonly found in commercial, residential and government security applications, where it enables effective night time imaging under low-light conditions. However, since active infrared light can be detected by night-vision goggles, there can be a risk of giving away position in tactical military operations. Laser range gated imaging is another form of active night vision which utilizes a high powered pulsed light source for illumination and imaging. Range gating is a technique which controls the laser pulses in conjunction with the shutter speed of the camera's detectors. Gated imaging technology can be divided into single shot, where the detector captures the image from a single light pulse, and multi-shot, where the detector integrates the light pulses from multiple shots to form an image. One of the key advantages of this technique is the ability to perform target recognition rather than mere detection, as is the case with thermal imaging. Thermal vision Thermal imaging detects the temperature difference between background and foreground objects. Some organisms are able to sense a crude thermal image by means of special organs that function as bolometers. This allows thermal infrared sensing in snakes, which functions by detecting thermal radiation. Thermal imaging cameras are excellent tools for night vision. They detect thermal radiation and do not need a source of illumination. They produce an image in the darkest of nights and can see through light fog, rain, and smoke (to a certain extent). Thermal imaging cameras make small temperature differences visible. They are widely used to complement new or existing security networks, and for night vision on aircraft, where they are commonly referred to as "FLIR" (for "forward-looking infrared"). When coupled with additional cameras (for example, a visible spectrum camera or SWIR) multispectral sensors are possible, which take advantage of the benefits of each detection band's capabilities. Contrary to misconceptions portrayed in the media, thermal imagers cannot "see" through solid objects (walls, for example), nor can they see through glass or acrylic, as both these materials have their own thermal signature and are opaque to long wave infrared radiation https://en.wikipedia.org/wiki/Night_vision

Hello from Canada. I do informal researching of sasquatch in the Western Canada (Canadian Rockies) area. My 'research' so far really just consists of going out into wilderness areas near or in the Rockies, and looking for potential signs of sasquatch. Nothing at all conclusive so far, but I go out looking whenever I can get out on weekends.

A bell-shaped curve which is the result you'd expect in nature. It reminds me of Dr. Hennen Fahrenbach's foot-measurement study. The length, foot width, and heel width all produced a bell-shaped curve. That's a lotta work Giganto and thanks for sharing. https://bigfootforums.com/topic/74344-height-exaggeration/page/2/?_fromLogin=1

I caught on to what you guys were referring to as IR. Thank you! Ive played with high end FLIR? I think you could easily tell the difference between a man and a Bigfoot. Not only size but clothing, etc.

I don't know, but then, I generally think bigfoot (with a question mark) only after the reasonable alternatives have been eliminated. Even then, it's usually on a percentage scale, not truly a "conclusion" in the sense of being certain. MIB

Ex boyfriend? Sounds like she might have had a few:} Redbone - Probably a bobcat but don't rule out fox. They make exactly that same sound and cadence but to my ear a slightly different pitch.

I still don't know what this is, but a feline of some sort is assumed... This was enough to keep an avid hunter out of his primo hunting ground in Eastern Iowa.

Definitely a bobcat or lynx. They have a variety of sounds and their screams can light up a still forest with sound. It can be very unnerving for someone who doesn't know what it is, especially if they're staying overnight in the woods. Listen to the noise they make at the 48-second mark in this video. That would frighten urban dwellers out of their mind!! ....and reduce them to this: https://www.youtube.com/watch?v=_8lXfAPf4Vc

Here is the plot from the SSR for all 2813 Class A sightings.

What animal huffs at you?