Author Topic: "Visual Realism", Part Deux  (Read 492 times)

Offline Toad

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"Visual Realism", Part Deux
« on: August 19, 2001, 09:34:00 PM »
Ok, I'm sure you all remember the visual realism example about seeing the numbers on a T-38 tail at 1000 feet.

Here's one related to looking at the ground. Should be of interest to all you Buff pilots and Jabo artistes.

Once again, this is absolutely not a "knock" on AH, WB, AW or FA. It's an example of what current pixel technology can display compared to what you can see in RL.

****

Instrument runways in the US have a 1000' marker painted on the runway 1000 feet from the approach end. This marker consists of two parallel white stripes that are 150 feet long and 30 feet wide. The two stripes are generally separated by about 50-60 feet but this can vary depending on the width of the runway.

When flying over such a runway, be it black asphalt or gray concrete, at what altitude can you easily distinguish both white 1000' marker stripes? (Assumes a relatively clear, cloudless day and a guy with 20/20 vision.)

A. 10,000'
B. 15,000'
C. 20,000'
D. 25,000'
E. 30,000'
F. 35,000'
G. 40,000'

Ok, take your best shot.

Answer after we get a few guess logged in.    :)

<Edited with bold to help Urchin remember the sizes.   :)>

[ 08-20-2001: Message edited by: Toad ]
If ye love wealth better than liberty, the tranquility of servitude than the animated contest of freedom, go from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains sit lightly upon you, and may posterity forget that you were our countrymen!

Offline Tac

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"Visual Realism", Part Deux
« Reply #1 on: August 19, 2001, 10:17:00 PM »
25,000 ?

Offline Urchin

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"Visual Realism", Part Deux
« Reply #2 on: August 19, 2001, 11:07:00 PM »
I'd guess 40,000.  Haven't ever actually LOOKED, but aren't those stripes pretty big?

Offline SOB

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"Visual Realism", Part Deux
« Reply #3 on: August 20, 2001, 05:15:00 AM »
20,000?
Three Times One Minus One.  Dayum!

Offline Nifty

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"Visual Realism", Part Deux
« Reply #4 on: August 20, 2001, 02:30:00 PM »
30,000 ft
proud member of the 332nd Flying Mongrels, noses in the wind since 1997.

Offline Baddawg

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"Visual Realism", Part Deux
« Reply #5 on: August 21, 2001, 12:11:00 AM »
Heck Toad I work at an International Airport and dang I have trouble seeing them at ground level.  :) just call me Mr. Magoo, honk honk road hog!

Offline Nash

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"Visual Realism", Part Deux
« Reply #6 on: August 21, 2001, 04:14:00 AM »
30k gotta be.

Offline Mox

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"Visual Realism", Part Deux
« Reply #7 on: August 21, 2001, 10:14:00 AM »
30K?

Offline DeeZCamp

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"Visual Realism", Part Deux
« Reply #8 on: August 21, 2001, 10:29:00 AM »
25k-30k

Offline Fatty

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"Visual Realism", Part Deux
« Reply #9 on: August 21, 2001, 10:42:00 AM »
40k, easily.

Offline DeeZCamp

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"Visual Realism", Part Deux
« Reply #10 on: August 21, 2001, 11:04:00 AM »
40k would be easy, but would you be able to diferntiate between the lines specifically, or would you only see a larger white mass  ;)

if your talking about just visually aquiring the general picture of the runway, and a coloring of the runway ends (threshold lines) TD markings ans such, ... hell you could probalby see that from 50k .. although you may not be able to visually see the separate lines.

angle also has to do with what you see.. From directly above would obviosuly be the easiest looking straight down.. but the more angle offesst you increase the harder it would be..

Offline Fatty

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"Visual Realism", Part Deux
« Reply #11 on: August 21, 2001, 11:16:00 AM »
Keep in mind you're talking the equivalent of 2 olympic sized swimming pools side by side.  You can even see home pools quite a ways up, and each line is about 10-20 times the size of a normal backyard pool.

Offline Toad

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"Visual Realism", Part Deux
« Reply #12 on: August 21, 2001, 12:00:00 PM »
Dammit, Fatty!   :)

OK, since Fatty pretty much gave it away...

It was very easy to differentiate between the lines specifically at FL 370. It was a bit harder at FL390. (Both my co-pilot and I; old eyes and young eyes.) I didn't get up to FL410 this trip, but maybe next time.

The field elevation for most of the ones we used as a "test" was in the neighborhood of 1000-1500'.

In any event, figure 35,000 feet above it is no problemo. You can probaly even add a few thousand to that.

BTW, Deez, angle didn't seem to matter much. We flew directly over some that had the nav aid co-located with the field. We also flew near some that had nav aids away from the field resulting in a pretty large angle when you looked at the field.
If ye love wealth better than liberty, the tranquility of servitude than the animated contest of freedom, go from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains sit lightly upon you, and may posterity forget that you were our countrymen!

Offline DeeZCamp

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"Visual Realism", Part Deux
« Reply #13 on: August 21, 2001, 12:10:00 PM »
Angle would come into affect i guess in relation to how far away from the field to right? I mean, that would also increase distance though.. so hmm? idunno..

hey toad when you gonna take me flyin  ;)

give me some visual tests then  :D

Offline AKDejaVu

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"Visual Realism", Part Deux
« Reply #14 on: August 21, 2001, 12:10:00 PM »
I was just thinking about you and your visualization threads yesterday while doing some yardwork Toad.

I heard a plane fly over.  I live well inside Portland city limits and there are minimum alt requirements in the tightly controlled PDX airspace.  A small cessna flew over at what must have been over 5000 feet.  I could see the pinstripes in the paintjob at that altitude.

AKDejaVu