Use ogr2ogr to create midpoints along lines

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Author Name: Filipe Dias (@fsdias)
Original Redmine Issue: 11515

Redmine category:processing/gdal
Assignee: Giovanni Manghi

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Following this blog post by Darren Cope, I found it is possible use ogr2ogr to create midpoints along a line using ogr2ogr. For example:

ogr2ogr OutputPoints.shp InputLines.shp -dialect sqlite -sql “SELECT AsText(Line_Interpolate_Point(InputLines.geometry, 0.5)),OTHER,FIELDS,CAN,GO,HERE from InputLines”

http://darrencope.com/2014/01/27/create-midpoints-along-lines-with-ogr/

It would be a valuable addition to Processing, since there's not equivalent algorithm available

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• assigned_to_id was changed from Victor Olaya to Giovanni Manghi

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Author Name: Andreas Neumann (@andreasneumann)

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Do you actually want new point geometries or is it just necessary for symbology? In the latter case, there is the marker line in QGIS, by which you can position a marker on the mid-point of a line (term is "central point").

[qgib]

Author Name: Filipe Dias (@fsdias)

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In this case, the actual geometries. In ecological surveys, it is quite common to plan surveys along line transects and to collect data in the middle, first or last quarter of the transect. This tool would be useful for that.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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already implemented.

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• resolution was changed from to fixed/implemented
• status_id was changed from Open to Closed