Reprojects feature coordinates from one coordinate system to another using the Grid InQuestII engine from Ordnance Survey, for use in Great Britain, Ireland, and Northern Ireland.

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Typical Uses

  • Reprojecting features when explicitly using the Grid InQuestII engine is desired

How does it work?

The GridInquestIIReprojector receives raster, vector, or point cloud features and reprojects their coordinates from one coordinate system to another, using Ordnance Survey’s Grid InQuestII engine.

Its library allows you to transform coordinates between ETRS89 (WGS84) and the national coordinate systems of Great Britain, Northern Ireland and the Republic of Ireland.

The following coordinate systems are supported:

  • ETRS89 (WGS84)

    • UTM Zone 29N

    • UTM Zone 30N

    • UTM Zone 31N

    • Cartesian

    • Geodetic

  • OSGB36 British National Grid

  • Irish Grid

  • Irish Transverse Mercator

Two vertical datums are available, for Irish systems only:

  • Malin Head

  • Belfast

This transformer always reprojects from the source coordinate system to the destination coordinate system, tagging the features with the destination coordinate system on output.

Any coordinate system set on the input features is ignored - it is not able to read coordinate systems from incoming features.

Usage Notes

  • FME has a Workspace Parameter, Reprojection Engine, that may be set to either FME (CS-Map) or Esri. This transformer will override this parameter setting.
  • The Reprojector provides similar functionality, and will use the default library (CS-Map or Esri) set in FME. It supports some of the same coordinate systems, but will not use the Grid InQuestII library.

Working With Coordinate System Transformers

FME inherently supports coordinate system transformations and reprojections.


Input Ports

Output Ports


Editing Transformer Parameters

Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click beside the applicable parameter. For more information, see Transformer Parameter Menu Options.

Defining Values

There are several ways to define a value for use in a Transformer. The simplest is to simply type in a value or string, which can include functions of various types such as attribute references, math and string functions, and workspace parameters. There are a number of tools and shortcuts that can assist in constructing values, generally available from the drop-down context menu adjacent to the value field.

Dialog Options - Tables

Transformers with table-style parameters have additional tools for populating and manipulating values.


Processing Behavior


Feature Holding


Dependencies Ordnance Survey Grid InQuestII engine, provided with FME
Operating System Restrictions Windows only

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Examples may contain information licensed under the Open Government Licence – Vancouver and/or the Open Government Licence – Canada.