Select Coordinate System

Geoscience > Main Launcher > Project Menu > Properties > Select Coordinate System

Select Coordinate System

This dialog allows you to select or create a new coordinate system within your project.

General Information

Coordinate System Groups

Categories of coordinate systems. This is mainly used to narrow down the list of Coordinate Systems so you can more easily find the coordinate system you want.

Coordinate Systems

A list of coordinate systems for the currently selected coordinate system group.

Search

Search for a string within the list of coordinate systems of the current coordinate system group.

Search: Search for the entered character string. This will limit the Coordinate Systems field to include only the systems that match the string entered.

Clear: Clear the search field. The Coordinate Systems field will show all systems.

Coordinate System Properties:

This area contains some basic information about the coordinate system to help you determine if you have selected the correct coordinate system.

Description: This is a general description of the area that the selected coordinate system applies to. Use this to assist you in determining if you have selected the correct coordinate system.

Datum: This is the geodetic datum of the coordinate system.

Ellipsoid: This is the reference ellipsoid of the datum. It specifies the mathematical model of the shape of the earth used for the selected coordinate system. This is sometimes referred to as the spheroid.

Units: These are the default surface units for the selected coordinate system. Note: If the Units are missing this is likely a geographical rather than a projected coordinate system. It is not recommended to use geographical coordinate systems as the software is designed to work with projected coordinate systems.

EPSG Number: This is the official EPSG (European Petroleum Survey Group) number defining the coordinate system. Coordinate systems are based on a table of coordinate systems published by the EPSG. Note: The if this EPSG number has the word "(Deprecated)" after it, it is recommended that the coordinate system not be used. Deprecated coordinate systems typically have errors and have been superseded by a similarly named coordinate system.

Surface Units: This option allows you to override the surface units of a predefined coordinate system. Typically you will only use this if you have a coordinate system that perfectly matches the coordinate system you want, but the predefined coordinate system has units of meters rather than feet. You can select from the following options.

Coordinate System Units: Use the surface units of the predefined coordinate system.
Meter: Use meters for the surface units.
Foot: Use a standard foot for the surface units. A standard foot is defined as 0.3048 meters.
US survey foot: This was the standard measurement unit for surveying many earlier coordinate systems include the NAD27 coordinate systems. A survey foot is defined as 0.3048006096 meters.
Clarke's foot: This was the standard measurement unit for surveying many earlier coordinate systems mainly in older Australian, southern Africa and British West Indian mapping systems. A Clarke's foot is defined as 0.3047972654 meters.

Note: The following options are available only when launching from the Project Properties located under Project in the SeisWare Launcher

Import: Load a predefined coordinate system from a *.wkt (well known text) or *.prj (Shapefile projection) format file.

Export: Save a predefined coordinate system to a WKT (well known text) or PRJ (shapefile projection) format file.

Edit: Edit the parameters of the currently selected coordinate system.

Details: Open the Detailed Coordinate System Parameters dialog showing the parameters of the currently selected coordinate system in greater detail.

Also See

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