Take the 2-minute tour ×
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It's 100% free, no registration required.

I'm using QGIS 1.8 with a PostGIS database and I have three postgis-layer in qgis a lines layer, a points layer and a polygon layer.

What I'm trying to do is to select a polygon in the polygon layer and mark all points within this polygon. For me the only way to do this is to use the button "select by polygon". But in this way i cannot use an existing polygon for selection.

I hope my problem is clear so far and you can help me to find a better solution. I'm an novice in QGIS and my English is not the best. Thank you.

share|improve this question

1 Answer 1

Two possible solutions:

  • You can use the "Vector->Research tools->Select by Location" and tick the "Use selected features only" checkbox.
  • If you want to actually export the points which intersect your selected polygon to a new shapefile then "Vector->Geopressing tools->Intersect" and again tick the "Use only selected features" checkbox. The input layer will be your points layer, and the select layer will be your polygon layer.
share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.