What size and rez PSD create, for super detail in TG?

[TheBadger]

Hi guys.

I would like to know if there is a way to easily understand scale and size between Photoshop and TG.

For example, I want to create a canyon by way of image map because I like this method. But when I create my PSD, what size and resolution should I set my psd so that I can get very close fine detail in TG (better than 1meter per pixel)? And, another issue I was having is how to think about scale in terms of Meters... IF a river will be (say) 10 miles long in TG, than I have found it difficult to think of how long my drawing should be in PS at PS scale. Now I really don't have to be exact or anything. But getting much closer than I have been would be good.

I understand that I can manipulate things in TG easily. But the problem I have been having with the way I have been doing things is that when I bring in an imprecise image mask to TG and alter it. I then can't control very well the height of the canyon realitve to the width of the canyon relative to the over all length of the canyon.

So,

Now say that i cave copied a river shape from a map. And I have a near exact outline of the river for (say) a ten mile section of the river. IF I want to bring in the image map and not resize or alter it in any way, then what is the resolution I should be working at in PS? See what I am trying to understand here So, 4000x?, or 8000x?... so on? Now its ok to me if I do have to increase the size in TG, but I want to do that less than I have been. (1pixel=1mete yes?)...

I think that there will be some compromise between file size and exactness. But first I need to know the real equivalent numbers. Which may have been posted in this forum before I think. But don't really recall that.

So to be clear, when bringing in (for example) a 10 mile long river as a image map, and for understandings sake, what size would the PS document be if the image map was say, 1:1, 1:2 or 1:100 scale, or whatever numbers are good for talking about this? I do understand this, I just don't know what the 1:1 numbers are.

Thank you if you can break this down for me!

[Dune]

If you need a 16,000 m long river and 1m 'real detail', I'd say a 16,000 px wide mask would be great; every pixel a meter. But half that would suffice also, I think, if you use a fractal to breakup the edges for more random 'detail'. In TG of course the measurement should be 16,000px by whatever width you need.
I don't know if this is any help. My maps are usually about 4kx4k.

[TheBadger]

Yes that helps. I think it answers my questions really. I think I was just making somethings more complex than they are. as normal.