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

[J. Thaddeus Eldredge]

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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