Hi Jochen,
I forgot to mention that the "Add geometry attributes" processing
algorithm can calculate length, perimeter and area values either
planimetric in the layer's CRS (as the "length", "perimeter", and "area"
functions) or planimetric in the project's CRS or ellipsoidal (as the
"$length"
Hi Jochen
The alternative to $area is to use area($geometry), which then applies
the area based upon the CRS of the layer and the specific geometry,
instead of the project. Perhaps this is what you are needing to apply.
---
Regards,
Nigel Berjak
Please consider the environment before printin
Il 14/03/2025 15:38, Jochen Albrecht ha scritto:
Thank you, Andrea. But let me reiterate that the layer is projected, so
the default should in either case be to apply the algorithm.
$area does not allow me to specify projection parameters. But by playing
with that option for the other tool, I fo
Hi Jochen,
as described in the user manual, the "Add geometry attributes"
processing algorithm [1] "generates a new vector layer ... containing
geometric measurements based on a selected CRS.", i.e. it measures
Cartesian planimetric length and area on the CRS's cartographic plane.
The "$area"
I am working with a projected vector layer (EPSG:31287) that, after
dissolving polygons, has just two areas with no more than 20 vertices each.
The total area should be exactly one million square meters.
When I use the Add Geometry Attributes function, the sum of the
calculated areas is less than a
