[GRASS-user] [GRASSLIST:1113] layers in vector datasets
mseibel at gmail.com
Sat Jun 17 16:03:20 EDT 2006
(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)
can someone simplify an explanation about layers in grass vectors?
i read about them on this page.
its under the "attribute management" section. it seems like they have more
to do with linking tables?
The reason i ask, is because i'm trying to input to the
v.net.steinerfunction without success. the function (as i understand
it) requires inputs
of arc layer, and point layer, but all in same file.
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.)
layer 0 (arcs) = lines connecting buildings to streets
layer 1 (arcs) = streets
layer 1 (point) = buildings
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.
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.
any help or clarification would be great! thanks in advance.
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