Linked Questions

9
votes
1answer
5k views

How to transform a selected multipart feature into singlepart features while editing in QGIS?

There are several questions and respective answers for how to make a multipart features Layer into a singlepart features one using QGIS: How to break a single polygon into multiple polys? How to ...
3
votes
3answers
3k views

Rotating labels in QGIS 2.8.2

I have a question concerning label placement in QGIS. I'd like to rotate every label by 180°. Therefore, I set the rotation value to 180 (I've tried different ones as well as different variable types) ...
3
votes
4answers
2k views

How to turn all lines into one direction?

How can I turn all features of my polyline (postgis and/or shapefile) into one direction - it doesn't matter what direction. I know how to switch the direction of lines but I have no idea how to ...
4
votes
2answers
3k views

Changing (flipping) line direction in QGIS?

I have river network in QGIS. I draw opposite direction one of the rivers. Now I want to change direction of that river. How can I do that in QGIS 3? (As I know it is flip in ArcGIS)
2
votes
1answer
2k views

How does one modify selected geometry with a function in qgis python console?

My example use-case is that I want to redistribute vertices along lines as in: Redistribute linestring vertices to specified distance How to create points in a specified distance along the line in ...
9
votes
1answer
1k views

How to reverse vertex ordering in polygons?

I am working with an Oracle spatial connection in QGIS through which I am accessing and editing a vector layer. I find that when I edit a geometry, the vertex ordering is reversed (to clockwise in the ...
1
vote
1answer
764 views

Switch line direction for PostGIS-lines in QGIS or Pgadmin

I am trying to switch the line direction in a PostGIS-layer. The postgis-geometry column is e.g. "LINESTRING(0 0, 1 1, 2 1, 2 2)". The reason is that my symbology is direction-dependent, but I drew ...
1
vote
3answers
585 views

Repository of ArcView 3.x Avenue commands/methods/general information?

The time has come for my great ArcGIS 10 skills to be put to the test... but we don't have readily available licenses for a lot of functionality that is exposed through ArcView 3.x's Avenue scripts. ...
2
votes
1answer
929 views

Reverse polygon direction in QGIS? [closed]

The following Python code is very helpful to reverse the direction of lines in QGIS: layer = qgis.utils.iface.mapCanvas().currentLayer() for feature in layer.selectedFeatures(): geom = feature....
0
votes
1answer
691 views

change the direction of the marker of a line in QGIS

I have a map with three lines. Each has a marker on it. I would like to reverse the direction of the topmost marker. So I open Style dialog and enter the expression "direction" * 180. The value of ...
2
votes
1answer
288 views

QGIS select reversed geometries

I have a road network and a geometry for each road direction. One Geometry from A->B and another Geometry from B->A. This geometries are covering each other. Is there a tool available in QGIS to ...
1
vote
1answer
85 views

Change MultiLineString direction in QGIS/PyQGIS

I am looking for a method in PyQGIS (QGIS3.x) of reversing the direction of a MultiLineString feature. If there is more than one part, the order of the parts should be reversed. I have found a ...