Questions tagged [constraint]
Restriction applied to attribute fields, excluding the field to accept certain values as input
9 questions
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QGIS and constraints with groups
I will make two fields 'group' and 'group feature' with a constraints rule, where each group have no duplicate 'group feature' id. Each feature 1 till 3 will only once per group. How can I set up a ...
- 51
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Survey 123 Connect - Constraints, answer not from file list
I'm trying to make a Survey using Survey 123 connect,
I want my user to enter a new ID but I want to make sure that the new ID is not the same as an exiting ID in a CSV file,
e.g I want the constraint ...
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1
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53
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ArcGIS Pro: Independently create optimized paths with fixed-width corridors from all sources to all destinations
I'm looking for a solution to create optimized fixed-width corridors as line features restricted by a barrier raster.
The corridors should be independent from each other, meaning intersections are ...
- 1
3
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Adding length constraints to line features in QGIS
I want to add length constraints to my line feature column 'type' depending on the field value, to make it impossible to create a new line longer than x m.
Below is a screenshot of the categorised '...
- 97
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How to make constrained Thiessen polygons in ArcGIS Pro/QGIS 3.26 [closed]
I want to make constrained Thiessen polygons in which the process of calculating polygons will stop when the each polygon touches the boundary line/coastline. How can I do it in ArcGIS Pro or in QGIS ...
- 39
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Attribute form constraint, using NULL
At 3.24.2, I have a Geopackage table containing two fields:
"interior_observed" is a Boolean, with a Checkbox widget type, true or false.
"egg_number" is an integer, with a Range ...
- 8,356
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611
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Check constraint on geometry column is not working as expected
I am going through the QGIS Training Manual (16.5.2) and could not figure out why the streets table throws a violation check error as trying to update a geometry column. I checked a very similar ...
- 263
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QGIS constraint not null depending on another field value
Does anyone know it is possible in QGIS to add a constraint to a field not to be null, only when another field has a certain value.
For example I have a field A that can be with value 'foo' or 'bar' ...
- 103
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Restricting the creation of lines for network creation in QGIS: start/end vertices must snap to existing vertices
My interest lies in network creation, however, knowing how to do that in general would be a plus. How is it possible to prevent a user from creating a line (line vector) without connecting it ...
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