How do I select all outermost features

Question

Is there anyway in QGIS that I can select all the outermost features on a map? On an island that would be all that have a coastline.

edit: This is what I'm trying to select: enter image description here

Could you elaborate a bit? And preferably add an illustration to show what you want to achieve. — Martin, Commented Jun 23, 2014 at 10:07
I don't know a lot about Qgis, but in Arcmap I would create a large polygon enclosing all your features. Then I'd use Erase to create holes in that polygon where your features are. Finally I'd select those of your features that share a border with the enclosing polygon, which now is not overlapping your features, with Select by location and Boundary touches as argument. — Martin, Commented Jun 23, 2014 at 13:10

Jens · Accepted Answer · 2014-06-23 14:46:41Z

6

Create a copy of your polygon file. Start editing and use Merge selected features (Advanced digitizing toolbar) to create one polygon (sorry, I do not have an English QGIS so menu names may vary).
Convert polygon (from step 1) to line using Vector > Geometry Tools > Polygon to Line
Use Vector > Spatial Query to select all parcels which intersects line file.

answered Jun 23, 2014 at 14:46

Jens

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