1
vote
1answer
24 views

Merge multiple linestring features into a single multilinestring

Using QGis or ogr2ogr how do I convert a vector file containing multiple linestrings features into a single multilinestring feature? At the moment I've been doing this manually by converting the data ...
0
votes
1answer
63 views

Why are some OSM GPX line string endpoints connected?

I am working with GPX files from OpenStreetMap to render the public transportation lines of Berlin. I converted them to GeoJSON using the togeojson script. For some reason some of the lines are ...
2
votes
0answers
108 views

How to add an offset to a GeoJSON layer in Leaflet?

Using the example GeoJSON tutorial code at leafletjs.com. Change the myLines variable so that the two lines overlap, but run in opposite directions as follows: var myLines = [{ "type": ...
2
votes
3answers
521 views

How to create a efficent linestring out of geography points using postgis

I'm trying to create a linestring out of geography points. At the moment I'm doing it like this: select ST_GeographyFromText(ST_Makeline(a.record_point)) from ( select (record_point::geometry) from ...