Bug report #17290
field calculator: extract Z coord does not work
| Status: | Closed | ||
|---|---|---|---|
| Priority: | High | ||
| Assignee: | - | ||
| Category: | Field calculator | ||
| Affected QGIS version: | master | Regression?: | Yes |
| Operating System: | win 10 64 bit | Easy fix?: | No |
| Pull Request or Patch supplied: | No | Resolution: | invalid |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 25188 |
Description
field calculator: extract Z coord does not work
given a 3D shapefile, the field calculator does not extract the Z coord.
used expression: z ($ geometry)
tests performed on OSGeo4W, does not work on: 2.14.19, 2.18.13 and 2.99 (ae4d26a675)
machine win 10 64 bit
History
#1
Updated by salvatore fiandaca over 7 years ago
salvatore fiandaca wrote:
field calculator: extract Z coord does not work
given a 3D shapefile, the field calculator does not extract the Z coord.
used expression: z ($ geometry)tests performed on OSGeo4W, does not work on: 2.14.19, 2.18.13 and 2.99 (ae4d26a675)
machine win 10 64 bit
geometry is lineStringZ
#2
Updated by salvatore fiandaca over 7 years ago
from other tests, it is known that to extract the coordZ just do z (point_n ($ geometry, 1))
the question remains whether it is a bug or not
#3
Updated by Nyall Dawson over 7 years ago
What z value would you expect it to give for a linestring? I'd say current behavior is correct, OR returning an array of all z values for the nodes in the line.
#4
Updated by Giovanni Manghi over 7 years ago
- Status changed from Open to Feedback
#5
Updated by salvatore fiandaca over 7 years ago
Nyall Dawson wrote:
What z value would you expect it to give for a linestring? I'd say current behavior is correct, OR returning an array of all z values for the nodes in the line.
for an isoipse i would expect the z value that is equal for all nodes.
But I realized that it would only be a special case with Z = constant
thank you
#6
Updated by Giovanni Manghi over 7 years ago
salvatore fiandaca wrote:
Nyall Dawson wrote:
What z value would you expect it to give for a linestring? I'd say current behavior is correct, OR returning an array of all z values for the nodes in the line.
for an isoipse i would expect the z value that is equal for all nodes.
But I realized that it would only be a special case with Z = constant
thank you
I suggest to close this ticket (behavior correct) or add a feature request (array with all the values of the nodes).
#7
Updated by salvatore fiandaca over 7 years ago
Giovanni Manghi wrote:
salvatore fiandaca wrote:
Nyall Dawson wrote:
What z value would you expect it to give for a linestring? I'd say current behavior is correct, OR returning an array of all z values for the nodes in the line.
for an isoipse i would expect the z value that is equal for all nodes.
But I realized that it would only be a special case with Z = constant
thank youI suggest to close this ticket (behavior correct) or add a feature request (array with all the values of the nodes).
yes, close as well.
thank you
#8
Updated by Giovanni Manghi over 7 years ago
- Resolution set to invalid
- Status changed from Feedback to Closed