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Update documentation/how-to/gnss.en.md
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Co-authored-by: Matthias Kuhn <matthias@opengis.ch>
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suricactus and m-kuhn authored Jun 3, 2024
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Expand Up @@ -87,6 +87,7 @@ the file [nlgeo2018.gtx from NSGI](https://www.nsgi.nl/rdnaptrans) and put it in

To obtain precise altitude data for Cadastral Surveying in Switzerland, users can access the file correction of the vertical grid shift through [Geoid OGD from Swisstopo](https://cms.geo.admin.ch/ogd/geodesy/Geoid_OGD.zip).
Following the download, users are advised to perform a conversion of the file labeled `chgeo04_htrans_lv95.agr` to `chgeo04_htrans_lv95.gtx`.
The QGIS processing algorithm `gdal:translate` (convert format) can be used for that.

## Usage
:material-tablet: Fieldwork
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