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Questions tagged [vector-field]

According to a vector field is an assignment of a vector to each point in a subset of space. A vector field in the plane (for instance), can be visualised as a collection of arrows with a given magnitude and direction, each attached to a point in the plane.

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6 votes
2 answers

Writing list as attribute field in PyQGIS

This answer got me close, but I only get the last value of my list for all object fields. Example: My list = [REL_1, REL_2, REL_3]. My layer has three ...
Simon's user avatar
  • 89
8 votes
0 answers

QGIS vector field marker not respecting map rotation [closed]

I’m working on a map the shows point displacement between two dates. These are survey benchmarks that are surveyed periodically to observe slope movement. Symbolizing this in QGIS is straight forward ...
Ragnar Heiðar's user avatar
1 vote
0 answers

QGIS 3.10 drop-drown list (value relation)

I am using QGIS 3.10. I created a field with a drop-drown list of 10 country names (using an imported csv file) . Is there an option to add a country that does not inculded in the list manually ...
YuvalM's user avatar
  • 399
2 votes
0 answers

Error: QGIS VectorFieldCalc plug-in "Raster_Parameters_Errors: More than one raster band in raster"

I have used VectorFieldCalc plug-in in QGIS several times before, to make maps of marine currents from .nc satellite data. Recently, I have tried to redo some of the maps and when I try to calculate ...
marta's user avatar
  • 53
1 vote
0 answers

No longer able to change shapefile field types in QGIS 3.6 or 3.8 using Refactor tool

I'm looking to merge 3 shapefiles and I am changing field names and types to coordinate before the merge process. I have been able to successfully use the refactor tool to change field types before (...
TE_gis's user avatar
  • 21
6 votes
1 answer

Graphical modeler in QGIS 3.0.3 - Access Vector Field in Calculator

I want to create an algorithm with the graphical modeler in QGIS 3.0.3 where i define one Vector Layer and a Vector Field from this Layer as my inputvariables. Then i want to access the field-values ...
Jens W.'s user avatar
  • 61
15 votes
1 answer

How to control the arrow length of vector field markers in the layer list legend?

In QGIS 2.14.5 LTR (and recently in QGIS 3.0) I've set up a beautiful map design with a graduated renderer and vector field markers for each value range (arrow length is directly proportional to ...
Jochen Schwarze's user avatar