Hi,
I have not used the raster calculator in a while but I am not sure about you
use of the \.
Examples in the user manual
(https://docs.qgis.org/3.16/en/docs/user_manual/working_with_raster/raster_analysis.html#raster-calculator)
use this as examples.
("elevation@1" < 50) * 1 + ("elevation@1" >= 50) * 2
I would try (expression 1) OR (expression 2). Layers names must be placed
between quotes “”.
You could also update your QGIS version to 3.16.
Nicolas Cadieux
https://gitlab.com/njacadieux
> Le 12 févr. 2021 à 09:09, Wanda Norman <wanda.mnorman2...@gmail.com> a écrit :
>
>
> Greetings friends:
>
> I am working on lesson 7.3.5 in the User Guide / Manual (QGIS 3.10) –
> Following along: Using the Raster Calculator.
>
> I am having difficulty with the calculation formula as indicated below:
>
> The manual states this formula should be used:
> Aspect@1 <=90 OR Aspect@1 >= 270
> Which I am assuming is incorrect because a) I get an error when I run it; and
> b) when I set the parameters using the expression operators the formula looks
> like this:
> “Aspect@1” <=90 OR “Aspect@1” >=270
> However, I still get the error:
> Error parsing formula
> Execution failed after 0.02 seconds
>
> With some help – I then tried this formula
> \“Aspect@1”\ <=90 OR \“Aspect@1”\ >=270
> Which worked for this assignment.
>
> However, moving on to lesson 7.3.6 – More criteria: which takes me to
> 21.12.2. Calculate slope (less than 2 and 5 degrees)
> I get the same error as above again.
>
> I am steadily working my way through the Manual and would appreciate any
> help. I am using QGIS version 3.10.9-A Coruna (64 bit) on a Windows PC.
>
> Thank you!
> Wanda Norman
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