[QGIS-Developer] Proper Way to Access Z from Point Vector Layer

[Benjamin Jakimow]

Hi Calvin,

you might use

feature.geometry().get().z()


Am 18/01/2022 um 15:27 schrieb C Hamilton:
> As I iterate through a point vector layer I get each feature. Normally 
> I would get access to the coordinate with
>     pt = feature.geometry().asPoint()
> Unfortunately, this is a QgsPointXY and not a QgsPoint and I need to 
> have access to the Z attribute. There is no function to return a 
> QgsPoint that includes the Z and M values.
>
> If I do feature.geometry().get() there are member functions such 
> as addZValue(), dropZValue (), but there is no getZValue().
>
> There is a function called vertexAt(QgsVertexId id) which returns a 
> QgsPoint, but the documentation is very unclear on how to actually use 
> this. What really is QgsVertexId and how should it be constructed? 
> Alternatively there is vertices() or vertices_begin () which are 
> iterators that potentially could be used.
>
> This all seems awkward and not documented well. What is the best way 
> to get a QgsPoint from a point feature which is coming from a 
> processing script like this?
>
>     iterator = source.getFeatures()
>     for cnt, feature in enumerate(iterator):
>
> Thanks,
>
> Calvin
>
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-- 
Benjamin Jakimow, Doctoral Researcher
Earth Observation Lab | Geography Department | Humboldt-Universität zu Berlin

e-mail:benjamin.jakimow at geo.hu-berlin.de

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