(sorry if this is a bit of a cross post, but i put a similar
question under v.net.steiner. since not everyone may realize its
really a layer question i figure'd id repost and ask)<br>
<br>
can someone simplify an explanation about layers in grass vectors?<br>
i read about them on this page. <a href="http://www.geog.uni-hannover.de/grass/grass61/manuals/html61_user/vectorintro.html">http://www.geog.uni-hannover.de/grass/grass61/manuals/html61_user/vectorintro.html</a><br>
its under the "attribute management" section. it seems like they have more to do with linking tables?<br>
<br>
The reason i ask, is because i'm trying to input to the v.net.steiner
function without success. the function (as i understand it)
requires inputs of arc layer, and point layer, but all in same file.<br>
<br>
when opening the "network" grass vector in QGIS, it reveals that there
are 3 layers. (which were built using v.patch to put them all
together.)<br>
layer 0 (arcs) = lines connecting buildings to streets<br>
layer 1 (arcs) = streets<br>
layer 1 (point) = buildings<br>
<br>
because you specify the a(rc)layer and n(ode)layer, the fact that i
have arcs in two layers seems like it is causing the function to bail.<br>
<br>
is there a way to put all the arcs on one layer? or is there something
else taht i am missing. layers in vector data models are a
foreign concept to me coming from the a/i workstation world.<br>
<br>
any help or clarification would be great! thanks in advance.<br>