Re: Observing vehicles from a distance
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: nasal avenger</div><div class="ubbcode-body">I have been assigned to observe vehicles for extended periods of time. I need to determine what vehicles are running and for how long, and collect video evidence, from a distance of 25-100 meters. I am using my naked eye and a DSLR with a telephoto lens.
I have been running into a few issues. I use the heat mirage rising from the exhaust pipe as an indicator that the engine is on. However, there are times when I KNOW a vehicle is running but I can't see any heat wash. I try to go out on bright, sunny days, and keep an alternating light/dark background behind the exhaust because these conditions seem to give the best results.
My questions:
What other indicators can be used to determine if a vehicle is running, besides exhaust heat and chassis vibration?
<span style="color: #FF0000">Perhaps there will be other indications such as movement in the vehicle, interior lights, windsheild wipers, headlights, brake lights, if parked in an area off the pavement possibly dust or vegatation being moved in the vicinity of the exhaust pipe, watch the radio antenna for movemnt, possibly the heat waves off of the hood or engine compartment, if there was a lot of dew that morning or it is in a cold environment, look for the melting of the frost on the hood or engine compartment due to the heat off of the running motor.Perhaps it is a hot day, what are the chances the person in the vehicle will have the windows up without the A/C on? What if it is a cold day, what are the chances the person will have the windows down or the windows up without the heater on? These are all factors that you need to concider when reporting on an objective. This is the reason for reporting ATB (Appears To Be), when you report on an objective, you cannot walk right up to the individual and measure him to confirm that he is 5'10" and 185Lbs, so when you report that information to Higher HQ you report " The individual ATB 5'10" and 185lbs". If you cannot see the exhaust but other indications may lead you to believe that the vehicle may be running, then report to higher that you cannot confirm or deny that the vehicle is running but it ATB based on other indications that you have observed.If you are in a warm to hot environment, flying insects (ie bees, flys) are attracted to the A/C in the vehicle (I believe its because of the moisture in the air), and we all know that the A/C only works when the vehicle is running. So, if you see the insects gathering arounf the windows of the vehicle that may be an indication that the vehicle is running and the A/C is on. Also, we all know that having the vehicle in accessory mode for a long period of time will drain the battery, so that being said, if you are observing a vehicle for a few hours and the "headlights" have been on the enitre time, what are the chances that the vehicle will start? Maybe the vehicle has been running the whole time. If it hasnt been running but the headlights have been on, as the battery wears down the headlights will begin to fade. Most of the time, what we do (or maybe just me), if I have had the vehicle in accessory mode for a period of time I will temporily run the vehicle to re-charge the battery, and then return the vehicle to accessory mode. When this happens, the headlights or other accessories that you may be observing will turn off momentarily and then come back on. This may be an indication that the vehicle was just started.</span>
What are the best conditions for viewing engine exhaust heat wash?
<span style="color: #FF0000">Cold conditions the exhaust will be seen more clearly.</span>
How can I prevent my eyes from fatiguing when I do these observations for several hours continuously?
<span style="color: #FF0000">Typically you must switch observation responcibilities with your partner as frequently as every 20-30 minutes. If that is not feasable, then other means are necessary. Always observe through your non-shooting eye, if you are not on a mission that will require shooting, then you can switch from eye to eye every 20 minutes or so. You will need to train your eyes to build up endurance. Observation is a skill just like any other, the more you train at it the better you will become and the longer you will be able yo do it.
One method that we used to due to relieve the strain and pressure on our eyes after focusing for periods of time is to look at earth tones. Greens, browns etc. Take your eye out of the glass and look at the grass or dirt. Do not focus on anything, just relax your eyes and look at those colors. This will help relax your eyes and remove the strain.Do this quite often, because as you know, the longer you strain your eyes, the longer it will take to relieve that strain and it will become strained much sooner from that point on. </span>
Sorry if this is the wrong forum for my post, mods please move this thread if that is the case. </div></div>
Hope that helps, take care and good luck.
Seth