[Qgis-us-user] How to convert raster elevation data using the raster calculator?

[Randal Hale]

I don't know which version of QGIS you're using - I have 3.34.9 up and 
running.

In my case I have a DEM (named dem) and my raster calculator expression is:

"dem at 1" * 3.28081

I also have the output layer specified although I could create a 
temporary layer.

Randy

On 8/25/24 18:34, Cristoforo Montanari via Qgis-us-user wrote:
>     I have an elevation DEM in the form of a GeoTIFF file downloaded 
> from USGS for a southern California area near Chatsworth CA. I noticed 
> so far the the default co-ordinate system seems to be EPSG:4326 WGS84 
> with the elevations in meters.
>
>     I tried many ways to convert the CRS to NAD83 California Zone 5 
> along with the elevations and so far only the X and Y axis and not the 
> elevation data are converted. I also tried to convert the elevation 
> data over to feet with gdalwarp however I was not yet successful at 
> doing so. When I checked my elevations they were still in meters.
>
>    I tried to convert the elevations over to feet by applying a scale 
> factor:
>
> |  "your_raster_layer" * 3.28084|
>
>  So far I couldn't get the raster calculator to accept the input. 
> There was a dialog box that came up stating that something about my 
> input was incorrect. Could I get some assistance please, how to use 
> the raster calculator with this type of DEM from USGS in GeoTIFF 
> format to apply the conversion factors to the elevations after I 
> converted to NAD83?
>
> P.S.
>
>   I seem to remember using QGIS a while ago and finding California 
> Zone 5 in my basket of CRS's however this time around I am only 
> finding NAD83 UTM 11. Is there a way to get back or download CRS for 
> California Zone 5 of NAD83?
>
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-- 
------------------
Randal Hale
North Rivergeographic Systems, Inc
https://www.northrivergeographic.com
https://www.qgis-us.org

I hope this email finds you in the mountains, and as sun peeps through the trees the squirrels begin foraging.
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