Hello,
I have imported a shape-file with lines and I want to create Polygons from
these lines.
The lines are arranged in a way that I only need to connect one end of the
line with the other end in order to close a polygon.
1. Is there a modul that automizes this task (connecting one end of a line
with the other end of the same line)?
2. How can I assign a single Value to the polygons created in the procedure
mentioned in 1. ?
Thank you for any helpful suggestions.
Richard
Hi,
IN GRASS 5.7
I guess the automatic way to connect your lines is using v.clean setting
tools=snap, be aware with the thresold value.Also with v.digit you could
assign a Value to each polygons (I usually assign values to centrois).
I'm not sure if all the features are working in the same way on older
GRASS versions. But if you are able to create the polygons then you
could export the file to a shapefile and edit the DBF file with (for
example) OpenOffice (using tools->Data source).
regards.
D.
I have imported a shape-file with lines and I want to create Polygons from
these lines.
The lines are arranged in a way that I only need to connect one end of the
line with the other end in order to close a polygon.1. Is there a modul that automizes this task (connecting one end of a line
with the other end of the same line)?2. How can I assign a single Value to the polygons created in the
procedure
mentioned in 1. ?Thank you for any helpful suggestions.
Richard
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It's informative and essential.
> I have imported a shape-file with lines and I want to create
> Polygons from these lines.
> The lines are arranged in a way that I only need to connect one end
> of the line with the other end in order to close a polygon.
>
> 1. Is there a modul that automizes this task (connecting one end of
> a line with the other end of the same line)?
>
> 2. How can I assign a single Value to the polygons created in the
> procedure mentioned in 1. ?IN GRASS 5.7
I guess the automatic way to connect your lines is using v.clean
setting tools=snap, be aware with the thresold value.
yes
Also with v.digit you could assign a Value to each polygons (I usually
assign values to centrois).
also 'v.category option=add' and 'd.what.vect -e' (after adding column
with db.execute or v.digit?).
I'm not sure if all the features are working in the same way on older
GRASS versions.
probably not.
But if you are able to create the polygons then you
could export the file to a shapefile and edit the DBF file with (for
example) OpenOffice (using tools->Data source).
I think that is more work than is needed, 5.7 should have all the low
level tools.
Hamish