[Qgis-user] How to convert depth belw ground level to depth below mean sea level in QGIS

[Nicolas Cadieux]

Hi,

In addition, the means sea level is dependent on a model (geiod).  Try to find out what “sea level” you need.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 3 mai 2022 à 06:08, kirk via Qgis-user <qgis-user at lists.osgeo.org> a écrit :
> 
> 
> Hi Navneet
> 
> This is  classic raster analysis.  You will need the corresponding Digital Elevation File (DEM).  If your water table data are in vector fomat, you will have to rasterize the data, preferably to the same resolution as the dem.  Then you can use the grid calculator to subtract the water tabke depth from the dem.  The resulting raster will be your water table height above sea level or the zero reference for the dem. You can contour the raster after that if required.
> 
> Kirk Schmidt
> 
> 
> 
> Sent from my Galaxy
> 
> 
> -------- Original message --------
> From: nr via Qgis-user <qgis-user at lists.osgeo.org>
> Date: 2022-05-03 5:08 a.m. (GMT-04:00)
> To: qgis-user at lists.osgeo.org
> Subject: [Qgis-user] How to convert depth belw ground level to depth below mean sea level in QGIS
> 
> Dear friends,
> 
> The data provided for depth of water table in my country by the CGWB is depth below ground level , but for drawing the water table contours in modflow software the depth of water below mean sea level is needed.
> So how the depth below ground level can be converted to depth with reference to mean sea level in QGIS
> 
> Regards
> Navneet
> QGIS user 
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