All Questions
Tagged with value-list qgis
11 questions
0
votes
0
answers
29
views
Is it possible to select multiple selections from different categories in a value relation drive down list?
I have used the following instructions to create a drive down list in the 'value relation' widget to allow a category to be selected in one attribute which filters the options in another. This has ...
- 203
0
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0
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26
views
All values entered using fields with a list of values are transformed into (0)
All values entered using fields with a list of values are transformed into (0) how can we find back the selected values, we lost a lot of work and can't find backups.
- 1
1
vote
2
answers
432
views
Extracting attributes list with unique values from QGIS Attribute table
How can be extracted and exported a list of all single values without duplicates from the column of an attribute table (e.g. "formations" column values of an attribute table of a vector ...
- 185
7
votes
1
answer
4k
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How to read a raster value table (VAT) in QGIS? [duplicate]
By default, QGIS does not seem to recognize "Value Tables" (VAT) the way ArcGIS does. So far I cannot find a way to represent the pixel values discretely, or apply a "legend" to the layer. Is there ...
- 23.2k
7
votes
3
answers
3k
views
Limiting list values based on previous field in QGIS Forms?
Looking for assistance to set up appropriate configuration to enable drop-down lists values to be filtered based on a previous value.
Basically, I have a 3-tiered categorisation structure to one of ...
- 591
3
votes
2
answers
2k
views
Limiting available values in dropdown field of QGIS form according to value selected in previous field?
I'm building a rather complex entry form for a layer stored in a PostGIS database. I am following this usage scenario:
On several occasions I have dropdown fields which lets the user select a type of ...
- 43
5
votes
3
answers
2k
views
Conditional value map widget in QGIS
I am looking for a way to implement conditional value mapping in QGIS. This means that the values available in attribute number 2 depend on the value provided in attribute 1.
Example:
If the user ...
- 462
2
votes
1
answer
2k
views
Display the size of the dot based on the value [duplicate]
I import a CSV File and for each coordinate, I get a point in the map.
Can I set a column for the value. Then the size should based on the value have a special size. Or based on all values, it should ...
- 21
2
votes
0
answers
275
views
Select intersecting features within Value Relation Widget
Is it possible to filter records in the Value Relation Widget to include only those that intersect the current feature?
We are trying to set up a layer for user input where we need to populate Start/...
- 591
4
votes
2
answers
4k
views
How to set proportional value in legend?
I have a GIS table with traffic flows.The thickness is proportional to the traffic value and I'd like to have a little legend with 3 links proportional to setted value (eg: link1 proportional to 100 ...
- 1,313
3
votes
1
answer
242
views
Can I use predefined list of values from Postgis when I draw lines in QGIS?
Lets say that we have 2 tables in Postgis:
Table 1 (PIPE):
-ID
-pipe_type_id
-geometry
Table 2 (PIPE_TYPE):
-ID
-type
foreign key PIPE.pipe_type_id - PIPE_TYPE.ID
Table PIPE is empty. Table ...
- 645