Viewing Distance...

[Rick]

I have 3-4 different viewing distance charts, but this has me puzzled..

What would the letter height be on a banner/sign, being viewed from 500 feet in the air, 7480 feet away..

 

[Mike Paul]

What would the letter height be on a banner/sign, being viewed from 500 feet in the air, 7480 feet away..

The letter height would stay the same.
Did you mean should ?

 

[Pat Whatley]

4" per 100 feet.

Triangulate....one side at 500', one side at 7480', one side at X

X/100 x 4"

So.....

7496.69 / 100 = 74.96 x 4 = 299.84 inches or right at 25 feet.

 

[Rick]

What would the letter height be? The angle only adds 9'-4"

Right now I have 22'-4' cap height

 

[pointjockey]

at that height I'm thinking you could only see crop circles

 

[kpeskin]

It depends on a number of factors that you haven't specified. (Font, color contrast, illumination, vision acuity of intended audience, where the sign is going to be displayed). But if we are to assume a vision level of 20/40 (generally accepted standard for drivers licensing and thus of the public at large), and that the sign is manufactured and displayed in the optimal fonts and colors, at the distance specified, the letters would need to be almost 22 feet (actually 262 inches) in height to be viewable (with >75% legibility) if the sign is parallel to the viewer.

Of course, I may have missed something in doing my math.

BTW, I was using 28.6 feet/inch letter height (taken from the technical report within the UDA model sign code that ISA will be distributing later this year).

 

[weaselboogie]

Sounds like trigonometry! I got 7496'


Apparently everyone else did too.

 

[zmatalucci]

you know you can just mail your Christmas list to santa..you don't have to make a sign big enough for him to read it from the north pole ;-)