where buildings are a point, with layer 1 (verified through QGIS)
where clipper is a polygon that is the bounds i want to pull the building points from. the odd thing about this dataset, is that when i go to load in QGIS, there are two layer options, layer 0 which is polygon and layer 1 which is line.
i cant specify blayer=0 in this function or it says must be 1 or greater.
is there a way to put the polygon layer on layer 1? i can only think this might be why there’s a problem. I still dont really grasp the layers concept very well. i understand it has to do with linking features to a database, but why does it put different features on different layers?
where buildings are a point, with layer 1 (verified through QGIS)
where clipper is a polygon that is the bounds i want to pull the
building points from. the odd thing about this dataset, is that when
i go to load in QGIS, there are two layer options, layer 0 which is
polygon and layer 1 which is line.
i cant specify blayer=0 in this function or it says must be 1 or
greater.
is there a way to put the polygon layer on layer 1? i can only think
this might be why there's a problem. I still dont really grasp the
layers concept very well. i understand it has to do with linking
features to a database, but why does it put different features on
different layers?
the output i get is a file with no data in it.
I don't think QGIS layers == GRASS layers.
Unless you are doing something advanced, usually grass vector layer is 1
and you can forget about that.
"v.info clipper" show boundaries + centroids or lines?
features need a category number in order to be extracted. does
d.what.vect show cat numbers for your points?
v.select works well and should be pretty simple, so don't give up.
i not doing anything advanced, at least it shouldnt be. i have a county wide, line roads dataset and county wide building points dataset. all i want to do is clip both vectors back to the same extent. basically i just want the features either clipped to the boundary of a polygon i built, or even just select overlapping ones, and write them to a new file.
i may be missing the concept of this, “features need a category number in order to be extracted. does d.what.vect show cat numbers for your points?”
d.what.vect shows catagory numbers for the building points. I’m not sure i understand what the category has to do with v.select.
v.info clipper does show boundaries and centroids and area (and islands?!?) i recently modified the clipper polygon box, and it seems that the centroid is outside the box now. i’ll put it in and give it another whirl.
where buildings are a point, with layer 1 (verified through QGIS)
where clipper is a polygon that is the bounds i want to pull the
building points from. the odd thing about this dataset, is that when
i go to load in QGIS, there are two layer options, layer 0 which is
polygon and layer 1 which is line.
i cant specify blayer=0 in this function or it says must be 1 or
greater.
is there a way to put the polygon layer on layer 1? i can only think
this might be why there’s a problem. I still dont really grasp the
layers concept very well. i understand it has to do with linking
features to a database, but why does it put different features on
different layers?
the output i get is a file with no data in it.
I don’t think QGIS layers == GRASS layers.
Unless you are doing something advanced, usually grass vector layer is 1
and you can forget about that.
“v.info clipper” show boundaries + centroids or lines?
features need a category number in order to be extracted. does
d.what.vect show cat numbers for your points?
v.select works well and should be pretty simple, so don’t give up.
thanks Hamish! i got it, finally. chalk one up to user error. thanks for your trouble shooting help, it did the trick!
my centroid was outside the polygon, so i put it inside, and built topology. then i used the type=area for binput, and worked great! extracted points and lines and should be good to go.
i not doing anything advanced, at least it shouldnt be. i have a county wide, line roads dataset and county wide building points dataset. all i want to do is clip both vectors back to the same extent. basically i just want the features either clipped to the boundary of a polygon i built, or even just select overlapping ones, and write them to a new file.
i may be missing the concept of this, “features need a category number in order to be extracted. does d.what.vect show cat numbers for your points?”
d.what.vect shows catagory numbers for the building points. I’m not sure i understand what the category has to do with v.select.
v.info clipper does show boundaries and centroids and area (and islands?!?) i recently modified the clipper polygon box, and it seems that the centroid is outside the box now. i’ll put it in and give it another whirl.
where buildings are a point, with layer 1 (verified through QGIS)
where clipper is a polygon that is the bounds i want to pull the
building points from. the odd thing about this dataset, is that when
i go to load in QGIS, there are two layer options, layer 0 which is
polygon and layer 1 which is line.
i cant specify blayer=0 in this function or it says must be 1 or
greater.
is there a way to put the polygon layer on layer 1? i can only think
this might be why there’s a problem. I still dont really grasp the
layers concept very well. i understand it has to do with linking
features to a database, but why does it put different features on
different layers?
the output i get is a file with no data in it.
I don’t think QGIS layers == GRASS layers.
Unless you are doing something advanced, usually grass vector layer is 1
and you can forget about that.
“v.info clipper” show boundaries + centroids or lines?
features need a category number in order to be extracted. does
d.what.vect show cat numbers for your points?
v.select works well and should be pretty simple, so don’t give up.