Cartographic system
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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 GPS 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.
Click Job.
Click Coordinate System.
Click Cartographic system.
Select a predefined system
X-PAD includes predefined cartographic systems for most of countries.
If a cartographic system is not already assigned, clicking Cartographic system shows this message.
Click YES to select a predefined system.
This opens a new window where to select the predefined system for a specific country.
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 its parameters.
Click Edit to enter in the Edit mode. In the Edit mode you can click on Add to enter a new system for the specific group.
Cartographic system parameters
Each system, predefined or manually enter, is defined by different parameters.
In Projection & Datum page the type of projection, datum and ellipsoid is defined.
Name: name to assign to the system.
Projection: cartographic projection to use.
Datum: datum to use to convert from the WGS84 ellipsoid to the cartographic system ellipsoid. Click the field to access a list of default and user-defined datum.
Ellipsoid: ellipsoid of the cartographic system. Click the field 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.
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.
While in the Cartographic system page, click Tools.
Click Save as predefined.
Save the current system in the User group of the predefined systems. The system can then be used in other jobs.
Cancel current cartographic system
This command allows to cancel the current selected cartographic system.
While in the Cartographic system page, click Tools.
Click Cancel current cartographic system.
Now the cartographic system is not defined.
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.
While in the Cartographic system page, click Tools.
Click Export in WKT format.