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

[Sebastian Gutwein]

I always use the raster calculator.
I found a write up here:
https://tinkerprojects.xyz/nerd-stuff/convert-a-dem-file-from-meters-to-feet-in-qgis/
If you are having trouble with the QGIS raster calculator you can try the
GDAL one in the processing toolbox.
https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/gdal/rastermiscellaneous.html#gdalrastercalculator

On Mon, Aug 26, 2024 at 8:59 AM J. Thaddeus Eldredge via Qgis-us-user <
qgis-us-user at lists.osgeo.org> wrote:

> I don't have the time for the real question but I can provide the Scale
> Factor.
> 3.28083333333...
> or
> 3937/1200
>
> Beware the international foot.  It will be standard soon...
> 0.3048m = 1 ft
> Then the scale factor will be 10000/3048
>
>
>
>
> J. Thaddeus Eldredge, PLS, CFM
>
>
>
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> On Sun, Aug 25, 2024 at 6:34 PM Cristoforo Montanari via Qgis-us-user <
> qgis-us-user at lists.osgeo.org> 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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-- 
___________________________
Sebastian "Bas* " Gutwein
*rhymes with Josh

Regenerative Design Group
1 Chevalier Ave
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(631) 241-1018

*Look close, think big, make change. *
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