Hi folks,
I do have another problem I would like some thoughts on.
I have vector areas representing water areas (lakes and oceans). I purchased these areas from the Irish and Northern Irish Ordinance Survey. They came as .dxf packages. I extracted them but they would not fill. I opened them in v.digit and found that the vector lines were broken, even missing in places. I did my best to close the vectors. The ocean was just a coastline. I had to modify it by attaching a the bounding box and taking away everything that didn't look like the ocean. Getting these areas to fill even though I think I managed to join most of the nodes. Some I think I really did join, some I know would not join.
Is there a simple(ish) way to generate areas that will be I can turn blue and say "here are the lakes and oceans"? I don't need them for analysis, but I would like to put maps generated into my dissertation and have them be pleasing to the eye.
Any help on this will be appreciated.
Kurt
On Mon, 2009-02-16 at 20:01 -0500, Kurt Springs wrote:
Hi folks,
I do have another problem I would like some thoughts on.
I have vector areas representing water areas (lakes and oceans). I
purchased these areas from the Irish and Northern Irish Ordinance
Survey. They came as .dxf packages. I extracted them but they would
not fill. I opened them in v.digit and found that the vector lines
were broken, even missing in places. I did my best to close the
vectors. The ocean was just a coastline. I had to modify it by
attaching a the bounding box and taking away everything that didn't
look like the ocean. Getting these areas to fill even though I think
I managed to join most of the nodes. Some I think I really did join,
some I know would not join.
Is there a simple(ish) way to generate areas that will be I can turn
blue and say "here are the lakes and oceans"? I don't need them for
analysis, but I would like to put maps generated into my dissertation
and have them be pleasing to the eye.
Any help on this will be appreciated.
Kurt
FWIW,
once I received a .dxf file that contained burned areas digitised by
GPS-supported devices. After getting the file in GRASS, it looked really
bad. As you describe, open "boundaries", missing parts of lines.
I had to "restore" it manually. I don't think there is another option
than hard-hand-working here. Except if you are lucky and you could use
v.clean to close boundaries, add centroids with v.centroid and play
around with colors. But I doubt it.
Kind regards, Nikos
On Feb 16, 2009, at 8:37 PM, Nikos Alexandris wrote:
On Mon, 2009-02-16 at 20:01 -0500, Kurt Springs wrote:
Hi folks,
I do have another problem I would like some thoughts on.
I have vector areas representing water areas (lakes and oceans). I
purchased these areas from the Irish and Northern Irish Ordinance
Survey. They came as .dxf packages. I extracted them but they would
not fill. I opened them in v.digit and found that the vector lines
were broken, even missing in places. I did my best to close the
vectors. The ocean was just a coastline. I had to modify it by
attaching a the bounding box and taking away everything that didn't
look like the ocean. Getting these areas to fill even though I think
I managed to join most of the nodes. Some I think I really did join,
some I know would not join.
Is there a simple(ish) way to generate areas that will be I can turn
blue and say "here are the lakes and oceans"? I don't need them for
analysis, but I would like to put maps generated into my dissertation
and have them be pleasing to the eye.
Any help on this will be appreciated.
Kurt
FWIW,
once I received a .dxf file that contained burned areas digitised by
GPS-supported devices. After getting the file in GRASS, it looked really
bad. As you describe, open "boundaries", missing parts of lines.
I had to "restore" it manually. I don't think there is another option
than hard-hand-working here. Except if you are lucky and you could use
v.clean to close boundaries, add centroids with v.centroid and play
around with colors. But I doubt it.
Kind regards, Nikos
I am almost sure that I can trace the areas in qgis I made a test with its drawing tools. Is there a way to import that tracing back to GRASS?
Kurt
[...]
Kurt:
I am almost sure that I can trace the areas in qgis I made a test
with its drawing tools. Is there a way to import that tracing back to
GRASS?
Kurt, if you mean to import them in GRASS, sure, why not? I suppose by
trace you mean you have created a vector map (shapefile probably). You
can either select the layer in your legend, save as Shapefile and then
v.in.ogr to import in GRASS _or_ you can use the GRASS-toolbox within
from QGIS.
Except if I misunderstand what you mean by trace.
Regards, Nikos