Questions tagged [connectivity-analysis]

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13
votes
2answers
4k views

Grouping connected linestrings in PostGIS?

I have a table of streets I've selected based on a set of attributes (let's say it's speed_limit < 25). There are groups of streets that are locally contiguous; I'd like to group these sets of ...
9
votes
4answers
15k views

Checking "connectedness'' of line shapefile in ArcMap?

I inherited a line shapefile in ArcMap that is used to represent a road network. The problem is that the road network is pretty large and it is impossible for me to: Tell if the end of each line (...
10
votes
1answer
907 views

Selecting the longest connected lines from PostGIS ST_ApproximateMedialAxis

I used PostGIS ST_ApproximateMedialAxis to transform polygons representing mountain ranges into a series of lines. Now, I'd like to select only the "longest" line segment for each group, so that I ...
7
votes
1answer
1k views

Clustering points and summing up attributes per cluster in QGIS

We want to find out the ideal location for sheds and the required dimensions of each shed. As input, we have a point layer with locations (each representing one arable field) and the estimated yield ...
1
vote
1answer
236 views

Orphan road segments in QGIS?

I am working with OSM road data for a developing nation. Included in the dataset are various small networks of roads that are orphans or islands i.e. not connected to the main road network. For ...