New answers tagged line
I am not sure if this could be done in QGIS but you could use st_split for this if it helps. Try to make a buffer around your points and then split it where they intersect. A same question is asked at How to split a line at point positions?
Go to settings Go to snapping options Select river layer Select pixcel from dragdown menu Choose around 10 pixcel for snapping limit.
If you are familiar with QGIS, FlowMapper Plugin will fully satisfy your expectations. Download QGIS and install FlowMapper by using embedded plugin manager. Supply input node coordinates and interaction matrix in plain text form then FlowMapper will automatically generate flow lines in shp format. Besides graduated width/symbology can be selected. ...
The simplest way is to use the points to create the line. To do this in QGIS use the Points2One plugin. Install this plugin (available via Plugins->Manage and install plugins) and follow the dialog to create a line from your points. If you have multiple lines, then make sure your points data has a suitable ID field to identify the lines they belong to. ...
It is a simple SQL statement, SELECT * FROM table_name WHERE ST_Intersects(the_geom, your_line_string) Replace your_line_string with whatever way you want to supply the geometry. Two nice ways are either as WKT or as a GeoJSON text string. First WKT SELECT * FROM table_name WHERE ST_Intersects( the_geom, ST_GeomFromText('LINESTRING(-160 ...
Reverse the operation interpolate desired ranges along segment edges. extrapolate integers from edge location via scripting, specify buffer range from edge, say 20 meters. Just an approach, not a specific answer.
This should probably get you pretty close to your goal: SELECT AID, BID, theOrder, rank() over (PARTITION BY AID order by theOrder asc) as rank FROM ( SELECT A."ID" AS AID, B."ID" AS BID, ST_line_locate_point(A."Shape", ST_ClosestPoint(A."Shape", B."Shape")) AS theOrder ...
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