Hi,
I'm battling finding an easy way to cut some lines with a polygon
boundary, and then deleting the line portions that are OUTSIDE the polygon.
Scenario:
4 separate SHAPE files with lines in them
1 shapefile with one polygon in it.
I need to cut the lines in all 4 shapefiles at the point that their
lines intersect the polygon boundary. Thereafter I want to delete the
line portions that are outside of this polygon boundary. In other words,
to be able to crop multiple layers according to some polygon boundary.
I would have thought this to be a trivial issue, but I have tried:
* Vector Geometry Processing Clip, but it wants to extract the
data inside the polygon and create a new file with the extracted
data. (To be expected)
* Plugin 'Clipper': I select my lonely polygon, and then activate
one of the line layers (which is also in edit mode).
The plugin seems to do nothing when I choose 'intersection' or
'clipping' preview, and when I choose 'clip' it tells me to
select at least one feature (but my polygon is still selected.)
The home-page link comes up as '404 not found'
* Didn't notice anything in the Advanced Digitizing plugin.
* CadTools and CadDigitize - no relevant facility found, but
really nice 'Help' doc - thanks guys!
* Feature 'Cut with Polygon from another Layer' deletes the pieces
I want to keep.
* Feature: 'Split selected features with line from another layer'
is to some extent what I want, but I want '... with polygon from
another layer'
So, I eventually gave up and converted my polygon into a line layer, and
used 'Split selected features with line from another layer', but this is
incredibly tedious because:
* It only does one layer at a time
* I then have to select the line segments that I want to delete.
So, does anyone know of a way to efficiently cut features in multiple
layers using a polygon, and then to be able to select the pieces
(multiple layers) that are either inside or outside the polygon, and
then delete them?
Regards & thanks in advance,
Zoltan
--
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Zoltan Szecsei PrGISc [PGP0031]
Geograph (Pty) Ltd.
GIS and Photogrammetric Services
P.O. Box 7, Muizenberg 7950, South Africa.
Mobile: +27-83-6004028
Fax: +27-86-6115323 www.geograph.co.za
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