Vertical system

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• X- PAD allows to select a vertical system independently from the used projection.

• At the end of each GNSS localization selection, the Vertical system page is visualized. This page allows to select the vertical system to use.

  

  • WGS84 ellipsoid height: the elevation is calculated on the WGS84 ellipsoid.

  • Elevation on local system: the elevation is calculation using the parameters from the current local system. For example if a single point or site calibration local systems have been calculated, the elevation is calculated from the local system parameters.

  • Reference elevation: allows to define a reference elevation. Click Details to measure a GNSS point and assign to it a reference elevation. The elevations will be calculated referred to a plane passing by this point.

  • Geoid: allows to calculate the elevation over the sea level using a geoid.

Download and use a geoid file

• In order to calculate GNSS elevations over the sea level a geoid file is required.

• To download the corresponding geoid click Geoids.

• Select the country and click on the geoid file to use.

  

• The file is downloaded to the controller and selected as vertical system.