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PyQGIS3: How to add elevation to a point?

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0

I am trying to add elevation to a 2D point in a QGIS 3 plugin, preferably in a concise and straightforward way. Not finding this easy. I think part of the problem is that in QGIS 3, fromPoint() has been renamed to fromPointXY(). I am not very clear on how to create 3D point geometry.

I have tried a number of variations without finding one which works and have not been able to find a suitable example online.

Basically what I want to achieve is PointXY + elevation -> Point, which I would expect to be something like this:

z = 1.0 # or whatever



for l in selectedLayers: # for each selected layer

  if l.geometryType() == QgsWkbTypes.PointGeometry: # point layer



    l.startEditing()

    feat = l.getFeatures()



    for f in feat: # each feature



      # Get existing geometry...

      geom = f.geometry()

      pt = geom.asPoint() # returns PointXY



      # Replace with 3D geometry...

      pt3D = QgsPoint(pt.x(), pt.y(), z)

      geom = QgsGeometry.fromPointXY(pt3D) # error, because pt is 3D

      ft.setGeometry(geom)



      l.updateFeature(f)



    l.commitChanges()

How do I do this?

pyqgis-3

share|improve this question

edited 4 mins ago

wotnot

asked 12 mins ago

wotnotwotnot

848

add a comment | 

0

I am trying to add elevation to a 2D point in a QGIS 3 plugin, preferably in a concise and straightforward way. Not finding this easy. I think part of the problem is that in QGIS 3, fromPoint() has been renamed to fromPointXY(). I am not very clear on how to create 3D point geometry.

I have tried a number of variations without finding one which works and have not been able to find a suitable example online.

Basically what I want to achieve is PointXY + elevation -> Point, which I would expect to be something like this:

z = 1.0 # or whatever



for l in selectedLayers: # for each selected layer

  if l.geometryType() == QgsWkbTypes.PointGeometry: # point layer



    l.startEditing()

    feat = l.getFeatures()



    for f in feat: # each feature



      # Get existing geometry...

      geom = f.geometry()

      pt = geom.asPoint() # returns PointXY



      # Replace with 3D geometry...

      pt3D = QgsPoint(pt.x(), pt.y(), z)

      geom = QgsGeometry.fromPointXY(pt3D) # error, because pt is 3D

      ft.setGeometry(geom)



      l.updateFeature(f)



    l.commitChanges()

How do I do this?

pyqgis-3

share|improve this question

edited 4 mins ago

wotnot

asked 12 mins ago

wotnotwotnot

848

add a comment | 

I am trying to add elevation to a 2D point in a QGIS 3 plugin, preferably in a concise and straightforward way. Not finding this easy. I think part of the problem is that in QGIS 3, fromPoint() has been renamed to fromPointXY(). I am not very clear on how to create 3D point geometry.

I have tried a number of variations without finding one which works and have not been able to find a suitable example online.

Basically what I want to achieve is PointXY + elevation -> Point, which I would expect to be something like this:

z = 1.0 # or whatever



for l in selectedLayers: # for each selected layer

  if l.geometryType() == QgsWkbTypes.PointGeometry: # point layer



    l.startEditing()

    feat = l.getFeatures()



    for f in feat: # each feature



      # Get existing geometry...

      geom = f.geometry()

      pt = geom.asPoint() # returns PointXY



      # Replace with 3D geometry...

      pt3D = QgsPoint(pt.x(), pt.y(), z)

      geom = QgsGeometry.fromPointXY(pt3D) # error, because pt is 3D

      ft.setGeometry(geom)



      l.updateFeature(f)



    l.commitChanges()

How do I do this?

pyqgis-3

share|improve this question

edited 4 mins ago

wotnot

asked 12 mins ago

wotnotwotnot

848

z = 1.0 # or whatever



for l in selectedLayers: # for each selected layer

  if l.geometryType() == QgsWkbTypes.PointGeometry: # point layer



    l.startEditing()

    feat = l.getFeatures()



    for f in feat: # each feature



      # Get existing geometry...

      geom = f.geometry()

      pt = geom.asPoint() # returns PointXY



      # Replace with 3D geometry...

      pt3D = QgsPoint(pt.x(), pt.y(), z)

      geom = QgsGeometry.fromPointXY(pt3D) # error, because pt is 3D

      ft.setGeometry(geom)



      l.updateFeature(f)



    l.commitChanges()

share|improve this question

edited 4 mins ago

wotnot

asked 12 mins ago

wotnotwotnot

848

share|improve this question

edited 4 mins ago

wotnot

asked 12 mins ago

wotnotwotnot

848

asked 12 mins ago

wotnotwotnot

848

asked 12 mins ago

wotnotwotnot

848