Reprojects one or more features to a local coordinate system centered on the bounding box containing all features.

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Typical Uses

  • Reprojecting multiple features into the same local coordinate system

How does it work?

The CommonLocalReprojector receives features and calculates their cumulative bounding box, then reprojects the features to a local coordinate system, centered on that box, with ground units in meters. The center of the data is used as the origin point to minimize and equalize distortion in all directions.

The Projection Type may be either Equidistant (AZMED) or Equal Area (ASMEA).

Reprojector vs. CommonLocalReprojector

The Reprojector can also reproject features to local coordinate systems, however, each feature is handled individually and receives its own coordinate system based on its bounding box. An example using neighborhood polygons is shown below (A). Each feature’s origin is at its center, and so they appear stacked on top of each other.

The CommonLocalReprojector creates a single local coordinate system that spans all of the input features, and applies it to all of them (B).

Z Values

Height is not considered so areas or distances are best preserved for geometry at an ellipsoid height of 0 meters. Despite height not affecting the coordinate system that will be generated, Z values may undergo a unit shift or geocentric to ellipsoid height conversion if a Vertical Handling mode of Heights are relative to the ellipsoid or geocentric is chosen.


Usage Notes

  • Rasters may only be reprojected in 2D (that is, with Vertical Handling set to Ignore heights and leave them unchanged).

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 None

FME Community

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