Reprojects attributes from one coordinate system to another using the PROJ library.


Transformation Type

Automatic Transformation Parameters

Manual Transformation Parameters


Coordinate System Definitions

There are three main methods for defining coordinate systems to be used with the PROJAttributeReprojector. EPSG numbers, WKT1 or WKT2 strings and PROJ strings. They are fully interchangeable and can be used in any combination to define the source and destination coordinate systems of an automatic transformation.

For example, here is LL-WGS84 defined with each method:





DATUM["World Geodetic System 1984",

ELLIPSOID["WGS 84",6378137,298.257223563,








+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs

Usage Notes

  • This transformer does not change the feature's coordinates – it only changes the values of the selected X, Y, and Z attributes (if they contain coordinate values).
  • Most grids needed by PROJ are already included with FME, however additional grid packs from PROJ can also be downloaded from the PROJ website. To use them, download the required proj-datumgrid archive from the above link and extract it to Reproject/ProjData within the FME install folder. PROJ will then automatically detect and use the new grids.

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.

FME Community

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Search for samples and information about this transformer on the FME Community.


Keywords: pointcloud