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


Transformation Type

Automatic Transformation Parameters

Manual Transformation Parameters

Output Coordinate System Tag

Raster Parameters

Interpolation Type

Select a method for interpolating reprojected cell values:

Nearest Neighbor The simplest and fastest method. Values are copied from the nearest cell.
Bilinear Calculates a weighted average, adjusted for distance, from the four (4) nearest cells.
Bicubic Calculates a weighted average, adjusted for distance, from the sixteen (16) nearest cells.
Average 4

Calculates a simple average from the four (4) nearest cells.

Similar to Bilinear and is useful for numeric rasters such as DEMs.

Average 16

Calculates a simple average from the sixteen (16) nearest cells.

Similar to Bicubic and is useful for numeric rasters such as DEMs.

Cell Size

Select a method for resizing cells:

Stretch Cells

The cell size of the raster will be adjusted to maintain the same number of rows and columns in the reprojected raster as there were in the input raster.

Square Cells

The number of rows and columns as well as the spacing will be changed to maintain approximately the same cell ground area and form square cells where the horizontal and vertical cell sizes are equal.

Preserve Cells

Like Square Cells, this option will change both the number of rows and columns and the spacing to maintain cell ground area, but will also try to preserve the original cell aspect ratio, taking into account any warping caused by the reprojection.

Tolerance (cells)

Sets the tolerance, in cells, for approximating reprojected cell locations.

Using the default value of 0.0, every cell will be reprojected.

If a value greater than 0.0 is specified, some cell locations will be approximated. The difference between an approximated cell location and the true cell location should be at most the tolerance value.

For example, if a value of 0.5 is specified, each approximated cell location should be maximum one-half of a pixel away from its true location. Increasing the Tolerance value may improve performance.

Coordinate System Definitions

There are three main methods for defining coordinate systems to be used with the PROJReprojector. 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 works with raster, vector, and point cloud data.
  • This transformer is unaffected by raster band and palette selection.
  • 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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Keywords: pointcloud