1

I know is easy to select uniques points, or polygons features from two datasources (using centroids and overlap, or buffer) , but it not so easy do the same with linestrings, many times it is even a nightmare.

So, how can you select uniques linestring from two datasources when there is very similar linestring features, some solaped, very near, o similar but not equals like this, or even more difficult, and if, in addition, you also want to select the unique segments of those linestrings ?

EXAMPLE two datasources with similar linestrings

1

I would like to share with you this technique that allows you to select those unique linestring elements from two different datasources.

What this technique do is:

  • Split lines that crosses with another line (only do it over one datasource, the other datasource keep untouched)
  • Create Black/White Mask from the untouched datasource.
  • Select lines or portions of lines from second datasource whose length is at least within a percentage (user selection) in the appropriate area of the mask from first datasource.

The full technique, step by step with example images, is described here: http://gisutilities.blogspot.com.es/2017/03/selecting-uniques-linestrings-features.html

This technique uses terminal commands line, QGIS, OpenJump and some script in python.

With this technique, you can get this (uniques linestring are green):

Example, uniques lines, green, and original lines, red

  • Please share more of your technique within your answer. – PolyGeo Mar 8 '17 at 10:02

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

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