Questions tagged [virtual-field]

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Access Google Cloud Data using VSIGS

I want to access landsat data from gcp-public-data-landsat bucket using vsigs . My code looks like , import os, sys from osgeo import gdal print(gdal.VersionInfo('–version')) print(sys.version) ...
2
votes
1answer
79 views

Forcing virtual field recalc in attribute table in QGIS

I have a layer with a virtual field, "LongLabel", an expression concatenating several of its data fields. When I edit a feature's data fields in the layer's attribute table/form, how can I force the ...
0
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1answer
40 views

Importing Virtual field in a geopackage

I have defined a virtual field to generate additional information in dependence of another attribute. Now I want to import the shape in a geopackage. I want to have the virtual field in the geopackage ...
4
votes
4answers
216 views

Placing data-defined labels both by expression and manually

In my project layers (QGIS 3.6.2) I use data-defined label placement. I am trying to set up the placement as follows: By default, the placement chosen in Label Settings is used (in my case, "around ...
1
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0answers
67 views

QGIS automation field from Excel

I present the following situation. 1 - Draw polygon shape in QGIS 3.4 / geopackage, only with two columns ID and NUM_SETOR, using the google maps image as reference. 2 - Excel table where I combine ...
1
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0answers
161 views

Changing Virtual field properties in QGis 3.0

I have some existing virtual field with set Length and Precision An example: The formula was first set to rounding it by 2 digits With the current settings it displays 10.00 instead of 10 because of ...
2
votes
1answer
225 views

Deleting virtual field in QGIS?

I'm trying to delete a virtual field from a layer attribute table. The layer source is a Spatialite database so I know that it's not straightforward to remove permanent fields, but as I understand it ...
4
votes
1answer
777 views

QGIS 2.16 Creating virtual field with aggregate expressions

With QGIS >=2.16, it is possible to use aggregates in expressions, such as sum, average... etc. But when I use it to create a new virtual field using the field calculator, the newly created field ...
4
votes
1answer
189 views

Using virtual fields as join fields in QGIS fails (NULL values in joined fields)

I have a point shapefile and a CSV file containing various attributes and three columns (here: street,num,addnum) based on which I would like to join both tables like attribute1;...;attributen;street;...
1
vote
1answer
275 views

Is there a way to copy virtual fields from one project to another?

I have a project with several layers, each of which has several quite complex virtual fields in order to analyse a particular site. I'd like to perform a similar analysis of a new site in a new ...
3
votes
3answers
421 views

QGIS add virtual field to csv layer

In QGIS 2.14.3 added a csv file as a layer. Attempt to add a virtual field like shown in the screenshot below (same result with "field_14" || ' ' || "field_10" || "field_11"): The field is created ...