Hi! On Wed, 2008-01-30 at 23:52 +0200, David Epstein wrote: > Hi Nikos, > > Thank you for that suggestion. Indeed, I did NOT realize that v.extract > was used to create new geometry in a layer. However, I too need some of > the islands (is there a technical difference between island, hole, and > missing polygon?).
I am not sure! Would be nice to have a kind of GRASS-GIS lexicon with (basic and non-basic) definitions! * island... I suppose are small poylgons within larger ones * holes... just "nothing" within larger polygons * missing polygon... ? > > There is a single missing polygon that I now have attribute data for and > I want to create the polygon (from the existing points and lines) and > fill-in the related attribute fields. > > I imagined some sort of interactive process of clicking on the relevant > bounding elements and *presto* the polygon would jump into existence. I > tried this in v.digit but was not able to get the desired result. If you just need to quickly correct a small number of polygons try with the "fresh-baked" QGIS (r0.9.2.rc1), which works as a GRASS frontend. 1. you need to add in your /etc/apt/sources.list following source: deb http://ppa.launchpad.net/timlinux/ubuntu gutsy main 2. sudo aptitude update && sudo aptitude upgrade --- if not already installed... "sudo apt-get install qgis qgis-plugin-grass"--- 3. Load GRASS plugin 4. Open your GRASS mapset within QGIS 5. Load your vector (polygon) file 6. Play with the tools... ( I have seen the new digitising tools... must be really what you are looking for!) and edit your polygons. *** You need first to "right click" on your vector layer and "save as shapefile" -- Then you can edit. > > This is a really basic step that people do several times a day, right? > > -david
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