[GRASS-user] re: streams under r.watershed

[Kurt Springs]

Thanks to Hamish and Markus Metz,

What I am doing is comparing two or three (possibly four) types of  
megaliths in my study area and trying to understand the relation ship  
between both contemporary monuments and later monuments.  While I was  
looking at old GIS maps, I was looking at the stream and basin maps  
and had overlaid the monuments on these maps.

First off, the vector river and stream maps, representing the current  
water ways are a bit different then the stream map.  The physical  
streams do seem to follow the stream maps, but there are many more  
branches on the stream map than there are actual streams.

Some of the megalithic tombs types seem to fall into the web of the  
streams, while others don’t.  I think this is important.  I am,  
unfortunately, an archaeologist, not a hydrologist, so I am not up on  
watershed lingo.

What I need to know is what information on these maps may tell me  
something important.  For example, are the stream systems shown on the  
watershed stream maps just important of them selves, or might the  
values the colors represent tell me something?  Is there a way to  
isolate them?

I guess what I am hoping for is a hydrologist who uses grass and can  
explain what I am looking at in the real world.

Kurt Springs