Questions tagged [vector-field]

According to https://en.wikipedia.org/wiki/Vector_field 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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2 answers
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Writing list as attribute field in PyQGIS

This answer got me close https://gis.stackexchange.com/a/286780/204059, 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 ...
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  • 65
8 votes
0 answers
108 views

QGIS vector field marker not respecting map rotation

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 ...
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1 vote
0 answers
36 views

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 ...
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  • 145
2 votes
0 answers
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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 ...
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  • 53
1 vote
0 answers
231 views

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 (...
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  • 21
6 votes
1 answer
621 views

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 ...
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  • 61
15 votes
1 answer
1k views

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 ...
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