[GRASS-user] vector area needs water fill

[Kurt Springs]

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