Breadcrumbs

Cartographic system

  • Setting the cartographic system is necessary when coordinates of points must refer to a system defined by a reference projection, datum, ellipsoid and transformation parameters.

  • The cartographic system can be used for:

    • The calculation of geographic coordinates of GNSS instruments.

    • The calculation of the scale factor to apply to distances measured with total stations

  • The software allows to select a predefined system or define a system with specific parameters.


  • From the Job tab select Coordinate System.

  • Select Cartographic system.

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Select a predefined system

  • X-PAD includes predefined cartographic systems for most of countries.

  • If a cartographic system is not already assigned, selecting Cartographic system this message is displayed.

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  • Select YES to select a predefined system. Or select NO to manually input the parameters.

  • If is selected to load a predefined system, this page is opened.

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    • Group: select the country or a group of systems (like UTM systems).

    • Systems: shows the available systems for the selected group.

  • Select a system to load the parameters.

If the selected cartographic system utilizes grid file, the software prompts to download the corresponding grid file.

  • Select Accept to confirm the selection.

  • If the job has already a GNSS localization and the cartographic system is changed, the software asks if the points already available in the job, with a valid latitude and longitude, have to be recalculated in the new system.

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    • All points: recalculates the coordinates for all points in the job with a valid latitude and longitude in the job.

    • No points: coordinate of points are not recalculated in the new system.

    • GNSS points: recalculates the coordinate only for points measured with a GNSS receiver.

    • TPS points: recalculates the coordinate only for points measured with a total station.

    • Imported points: recalculates the coordinate only for points imported in the job.

    • Other points: recalculates the coordinate for points calculated, for example in COGO, or manually entered.

Cartographic system parameters

  • Each system, predefined or manually entered, is defined by different parameters.

  • In Projection & Datum page the type of projection, datum and ellipsoid is defined.

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    • Name: name to assign to the system.

    • Projection: cartographic projection to use. Open the drop-down list to select a projection. The projection parameters are defined in the Parameters tab.

    • Datum: datum to use to convert from the WGS84 ellipsoid to the cartographic system ellipsoid. Press to access a list of default and user-defined datum.

    • Ellipsoid: ellipsoid of the cartographic system. Press to access a list of default and user-defined ellipsoids.

  • Parameters page lists the parameters of the projection. The parameters in this page depends on the projection selected.

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    • Lat. Origin: Defines the latitude of the origin of the coordinate system.

    • Long. Origin: Defines the longitude of the origin of the coordinate system.

    • Parallel 1: Specifies the first parallel for the coordinate system.

    • Parallel 2: Specifies the second parallel for the coordinate system.

    • False East: Defines the coordinate for the false East of the coordinate system.

    • False North: Defines the coordinate for the false North of the coordinate system.

    • Scale: Sets the scale factor of the coordinate system.

Save a cartographic system as predefined

  • It is possible to save a cartographic system as predefined for all the jobs.

  • In the Cartographic system page select Tools.

  • Select Save as predefined.

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  • Save the current system in the User group of the predefined systems to be quickly accessed.

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Cancel current cartographic system

  • This command allows to cancel the current selected cartographic system.

  • In the Cartographic system page press Tools.

  • Select Cancel current cartographic system.

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  • Now the cartographic system is not defined.

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Export in WKT format

  • A cartographic system can be exported in the standard format WKT. Well-known text (WKT) is a standard text format for describing coordinate reference systems. It's used in geographic information systems (GIS) and web mapping APIs and can be used in different software.

  • In the Cartographic system page select Tools.

  • Select Export in WKT format.

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