snowsniper Posted May 11, 2018 Posted May 11, 2018 hi all maybe you guys knows : yesterday i did a full fog landing with no visibility with the AV8 in AWSL landing configuration. as the AWSL did the job i was really surprised that the FLIR system only show a big green cloud of fog and can't see the land though fog ? is it accurate or should IR show land wihout a green fog layer ? i7-10700KF CPU 3.80GHz - 32 GO Ram - - nVidia RTX 2070 - SSD Samsung EVO with LG TV screen 40" in 3840x2150 - cockpit scale 1:1 - MS FFB2 Joystick - COUGAR F16 throttle - Saitek Pro Flight Rudder Pedals
Repth Posted May 11, 2018 Posted May 11, 2018 (edited) It's accurate as far as the modelling in DCS goes, fog scatters infrared light the same way it scatters visible light. And the more dense the fog is the harder it is for the FLIR to penetrate it. Unfortunately we don't have a very detailed simulation of FLIR in DCS. It's essentially a filter overlayed on the image you are seeing. ED have claimed that a remodel of FLIR will be done at some point, but we don't know when it will happen. Edited May 11, 2018 by Repth corrections to info.
ChickenSim Posted May 11, 2018 Posted May 11, 2018 Water is the bane of infrared sensors due to its absorption and scattering properties. Whether it's high absolute humidity or actual visible moisture, it's going to severely degrade the capability of your IR sensors, which usually look into the 3-5μm (MWIR) or 8-12μm (LWIR) portions of the spectrum specifically to get around the worst effects between 5-8μm. You shouldn't expect to be able to see through fog or clouds even after the IR rework. "It is also true that we parted ways with Chicken after some disagreements."
JIMJAM Posted May 13, 2018 Posted May 13, 2018 (edited) I flew helis IRL and on occasion the field's location could go zero zero very quickly with fog. Often we would go to white hot and follow railroad tracks that retained heat from the day's heat. Don't recall the exact distances but in thick fog with no rvr 1/2 mile easy. Arrowhead systems like the Apache systems was even better. I remember over the Bulldog MOA S of Shaw AFB we would watch hunters shining flash lights for deer and be able to see moonlight reflecting off of illegal stills from 5000 agl @ 1 mile+. Light /heavy rain disrupts sensor's abilty fairly drastically. That was mid 90s. Todays Lynx high-resolution synthetic aperture radar use " I heard from a friend of a friend" on unmanned recon types has scary high rez in all types of environments. Basically x ray abilites. Edited May 13, 2018 by JIMJAM
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