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In QGIS 3.14 I try to get elevation data from denmarks elevation model using "kortforsyrningen" plugin. The elevation model (layer name = 'DHM/Terræn') is added as a raster layer (QgsRasterLayer with qgis._core.QgsSingleBandColorDataRenderer)

I use this code (copied from here) to extract elevation at a point in Denmark:

from qgis.core import QgsProject
dhmLayer = QgsProject.instance().mapLayersByName('DHM/Terræn')[0]
x = 724501
y = 6175727
val, res = dhmLayer.dataProvider().sample(QgsPointXY(x, y), 0)

but all I get is val == nan and res == False.

I also tested the other way:

ident = dhmLayer.dataProvider().identify(QgsPointXY(x, y), QgsRaster.IdentifyFormatValue)

With similar results (ident.result() == {}). ident.error() yields

<QgsError: WMS provider Format not supported>

Does anyone have any hint to how to solve this?

2
  • Does val, res = dhmLayer.dataProvider().sample(QgsPointXY(x, y), 1) return something? Commented Oct 22, 2020 at 12:25
  • only (val, res) = (nan, False) Commented Oct 22, 2020 at 13:40

1 Answer 1

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QGIS methods that comment sample and identify query data from images stored on physical or network.

Is it possible to iterate over all pixels in a raster layer from a WMS service ?

Certainly it should be possible

This question was answered here, you will see an option Reading data from raster layer obtained via WMS in QGIS

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