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add an example how to get swiss altitude #442

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Jun 3, 2024
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add an example how to get swiss altitude
lucienicolier Apr 12, 2024
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Update documentation/how-to/gnss.en.md
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Expand Up @@ -85,6 +85,10 @@ For example:
For the transformation from ETRS89 (reference ellipsoid GPS) to NAP (Dutch) users can download
the file [nlgeo2018.gtx from NSGI](https://www.nsgi.nl/rdnaptrans) and put it in the directory.

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`.
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The QGIS processing algorithm `gdal:translate` (convert format) can be used for that.

## Usage
:material-tablet: Fieldwork

Expand Down Expand Up @@ -147,6 +151,7 @@ The logs will be placed in *Android/data/ch.opengis.qfield/files/QField/logs*.
!!! note
    Be aware that if the log is always turned on, it will fill up all the storage.


## Mock location
:material-tablet: Fieldwork

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