EsriReprojector

Reprojects feature coordinates from one coordinate system to another using the Esri reprojection engine.

Typical Uses

Reprojecting features when explicitly using the Esri reprojection engine is desired.

How does it work?

The EsriReprojector receives features and reprojects their coordinates from one coordinate system to another, using Esri coordinate system definitions and the Esri reprojection engine.

It is not necessary to have Esri products installed to use it.

Both a Source and Destination Coordinate System must be specified, and any coordinate system previously set on the input features will be ignored. Coordinate systems may be selected from a list of available choices, or provided in an attribute value or user parameter. Values must be in the form ESRIWKT|<name>|<esriwkt> where <name> is the coordinate system name, and <esriwkt> is the WKT (Well-Known Text) representing the coordinate system.

If the selected pair of coordinate systems has appropriate Geographic Transformations available, they will be provided.

Geographic Transformation

Both predefined and custom geographic transformations are supported.

Predefined Esri coordinate systems and geographic transformations may be found here.

Geographic transformation names are case-sensitive.

Note Some geographic transformations require transformation grid files that may not be present in ArcGIS or FME by default. If such a transformation is chosen and the grid file is missing, an error will occur. A number of grid files are available in the Reprojection Grid Files download at FME Downloads. Grid files should be placed in the appropriate subfolder in FME\Reproject\EsriPEGridData\.

You can also enter GEOGTRAN Well Known Text that represents a geographic transformation.

Using Custom Transformations

Custom transformation files (*.gtf files) can be stored in a number of locations that the EsriReprojector will search for.

All platforms, including without Esri products installed:

<FME_HOME>\Reproject\EsriPEGridData\customTransformation

With Esri products installed:

On Windows systems, additional folders inside the users %appdata% folder will also be searched.

These folders are used by relevant ArcGIS products. If you create a custom transformation inside one of the supported ArcGIS products, the *.GTF file will be stored in the related folder inside %appdata%.

Supported products include ArcGIS Pro, Desktop 10.2 → 10.8.

Full list of %appdata% directories:

%appdata%\Esri\ArcGISPro\ArcToolbox\CustomTransformations

%appdata%\Esri\Desktop10.8\ArcToolbox\CustomTransformation

%appdata%\Esri\Desktop10.7\ArcToolbox\CustomTransformations

%appdata%\Esri\Desktop10.6\ArcToolbox\CustomTransformations

%appdata%\Esri\Desktop10.5\ArcToolbox\CustomTransformations

%appdata%\Esri\Desktop10.4\ArcToolbox\CustomTransformations

%appdata%\Esri\Desktop10.3\ArcToolbox\CustomTransformations

%appdata%\Esri\Desktop10.2\ArcToolbox\CustomTransformations

Rasters

Additional parameters are available for raster features, specifying how the reprojected cells are to be interpolated.

This transformer is not affected by raster band and palette selection.

Vertical and Time-Dependent Transformations

Optional parameters for handling time-based (epoch) and vertical transformations are also available.

Examples

Usage Notes

FME also has a Workspace Parameter, Reprojection Engine, that may be set to either FME (CS-Map) or Esri. Using this transformer will override this parameter setting.
When using Epoch, only inter-frame transformations are supported, where input and output features are the same epoch. To transform from one epoch to another, consider using the PROJReprojector.

Working With Coordinate System Transformers

FME inherently supports coordinate system transformations and reprojections.

Coordinate System Support and Reprojection

Coordinate systems generally have a name and a definition, and the syntax of that definition can vary greatly between both spatial data formats and other coordinate system libraries. Custom and local coordinate systems can also be defined in FME, further complicating matters. For in-depth information, see the Working With Coordinate Systems documentation.

Reprojections are generally done with the FME Reprojection Engine, which is based on the CS-Map coordinate system library. This default can be overridden on a per-workspace basis, using the Workspace Parameters > Translation > Reprojection Engine parameter, and set to Esri. Where appropriate, FME will use the Esri Reprojection Engine if it is selected there, with or without an Esri product being installed.

Coordinate System Support

These transformers perform various coordinate system-related tasks, but do not reproject the data.

CoordinateSystemDescriptionConverter	Looks up coordinate system names and definitions between FME’s internal format and common third-party and open source representations, storing the results as an attribute.
CoordinateSystemExtractor	Retrieves the name of the feature's assigned FME coordinate system into an attribute.
CoordinateSystemRemover	Removes the coordinate system from features, without modifying geometry or coordinates.
CoordinateSystemSetter	Assigns a specified coordinate system to features, without modifying geometry or coordinates.
LocalCoordinateSystemSetter	Assigns a specified local coordinate system to features, without modifying geometry or coordinates.

Coordinate System Reprojection

Different coordinate system libraries (engines) not only contain coordinate system definitions, they also have unique reprojection algorithms. FME’s generic reprojection transformers, in the first table below, default to using the FME (CS-Map) library.

A selection of other libraries is also available, some of which are specific to certain areas of the world or software platforms.

Inherent reprojections, as in a workspace with different input and output coordinate systems selected, default to using the FME (CS-Map) library.

If you are reprojecting explicitly with a transformer in the workspace, using library-specific transformers is recommended. In the case of CsmapReprojector versus the Reprojector (with default engine), the library may be identical, but the CSMapReprojector handles vertical coordinate calculations whereas the Reprojector does not.

Generic Reprojection Transformers

		Library
AttributeReprojector	Reprojects x and y coordinates stored as attributes from one coordinate system to another.	FME (default) or Esri
CommonLocalReprojector	Reprojects one or more features to a local coordinate system centered on the bounding box containing all features.	FME (default) or Esri
ReprojectAngleCalculator	Converts a given angle from one coordinate system to another.	FME (default) or Esri
ReprojectLengthCalculator	Converts a given length from one coordinate system to another.	FME (default) or Esri
Reprojector	Reprojects feature x and y coordinates from one coordinate system to another.	FME (default) or Esri

Library-Specific Reprojection Transformers (Recommended)

		Library (External Links)
CsmapAttributeReprojector	Reprojects x, y, and optionally z coordinates stored as attributes from one coordinate system to another using the CS-MAP library.	CS-Map
CsmapReprojector	Reprojects feature x, y, and optionally z coordinates from one coordinate system to another using the CS-Map library.	CS-Map
EsriReprojector	Reprojects feature coordinates from one coordinate system to another using the Esri reprojection library.	Esri
GridInQuestIIReprojector Great Britain Northern Ireland Republic of Ireland	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.	Grid InQuestII
GtransAttributeReprojector Sweden	Reprojects coordinates stored as attributes from one coordinate system to another using the Gtrans reprojection engine from the National Land Survey of Sweden (Lantmäteriet).	Gtrans
GtransReprojector Sweden	Reprojects feature coordinates from one coordinate system to another using the Gtrans reprojection engine from the National Land Survey of Sweden (Lantmäteriet).	Gtrans
PROJAttributeReprojector	Reprojects coordinates stored as attributes from one coordinate system to another using the PROJ library.	PROJ
PROJReprojector	Reprojects feature coordinates from one coordinate system to another using the PROJ library.	PROJ
ReframeReprojector Switzerland	Reprojects feature coordinates from one coordinate system to another in Switzerland, using the Reframe library from the Federal Office of Topography (swisstopo).	REFRAME

Configuration

Input Ports

Output Ports

Parameters

Horizontal

Source Coordinate System	Select the coordinate system of the incoming features. Available Esri coordinate systems can be accessed via the ellipsis button, where coordinate systems may also be imported. The coordinate system may also be provided as Esri WKT via an attribute or user parameter. Values must be in the form ESRIWKT\|<name>\|<esriwkt> where <name> is the coordinate system name, and <esriwkt> is the WKT (Well-Known Text) representing the coordinate system. The coordinate system selected here will override any coordinate system already attached to the features.
Destination Coordinate System	Select the coordinate system to be reprojected to. Available Esri coordinate systems can be accessed via the ellipsis button, where coordinate systems may also be imported. The coordinate system may also be provided as Esri WKT via an attribute or user parameter. Values must be in the form ESRIWKT\|<name>\|<esriwkt> where <name> is the coordinate system name, and <esriwkt> is the WKT (Well-Known Text) representing the coordinate system.
Geographic Transformation	A selection of available geographic transformations is provided once a Source and Destination Coordinate System are set.
Epoch	(Optional) A decimal year value representing the time dimension to be used, for time-dependent geographic transformations. The value may also be an ISO or FME formatted datetime. If the Geographic Transformation provided is time-dependent, and no Epoch is supplied, then the translation will fail. If the Geographic Transformation provided is not time-dependent, and an Epoch is supplied, then the Epoch will be ignored and the translation will continue. Note Only inter-frame transformations are available at this time - that is, both the input and output features will have the same epoch.

Vertical

Vertical Handling	Select a method for transforming height values on incoming features: Use Geographic Transformation: Height values are transformed according to the Geographic Transformation parameter. If the chosen Geographic Transformation does not have a vertical component, height values are left unchanged. Use Vertical Transformation: Height values are transformed according to the Vertical Transformation parameter. When Use Vertical Transformation is selected, Source Vertical Coordinate System, Destination Vertical Coordinate System, and Vertical Transformation are enabled and required.
Source Vertical Coordinate System	Select the vertical coordinate system of the incoming features. Available Esri vertical coordinate systems can be accessed via the ellipsis button, where vertical coordinate systems may also be imported. The vertical coordinate system may also be provided as Esri WKT.
Destination Vertical Coordinate System	Select the vertical coordinate system to be reprojected to. Available Esri vertical coordinate systems can be accessed via the ellipsis button, where vertical coordinate systems may also be imported. The vertical coordinate system may also be provided as Esri WKT.
Vertical Transformation	A selection of available vertical transformations is provided once a Source and Destination Vertical Coordinate System are set. The vertical transformation may also be provided as Esri WKT.

Raster

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.

Editing Transformer Parameters

Transformer parameters can be set by directly entering values, using expressions, or referencing other elements in the workspace such as attribute values or user parameters. Various editors and context menus are available to assist. To see what is available, click beside the applicable parameter.

How to Set Parameter Values

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.

Using the Text Editor

The Text Editor provides a convenient way to construct text strings (including regular expressions) from various data sources, such as attributes, parameters, and constants, where the result is used directly inside a parameter.

Text Editor

Using the Arithmetic Editor

The Arithmetic Editor provides a convenient way to construct math expressions from various data sources, such as attributes, parameters, and feature functions, where the result is used directly inside a parameter.

Arithmetic Editor

Conditional Values

Set values depending on one or more test conditions that either pass or fail.

Parameter Condition Definition Dialog

Content

Expressions and strings can include a number of functions, characters, parameters, and more.

When setting values - whether entered directly in a parameter or constructed using one of the editors - strings and expressions containing String, Math, Date/Time or FME Feature Functions will have those functions evaluated. Therefore, the names of these functions (in the form @<function_name>) should not be used as literal string values.

Content Types

String Functions	These functions manipulate and format strings.
Special Characters	A set of control characters is available in the Text Editor.
Math Functions	Math functions are available in both editors.
Date/Time Functions	Date and time functions are available in the Text Editor.
Math Operators	These operators are available in the Arithmetic Editor.
FME Feature Functions	These return primarily feature-specific values.
FME Parameters	FME and workspace-specific parameters may be used.
Creating and Modifying User Parameters	Create your own editable parameters.

Dialog Options - Tables

Table Tools

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

Row Reordering

Enabled once you have clicked on a row item. Choices include:

Add a row
Remove a row
Move current row up one
Move current row down one
Move current row to top
Move current row to bottom

Cut, Copy, and Paste

Enabled once you have clicked on a row item. Choices include:

Cut a row - delete and copy to clipboard
Copy a row to the clipboard
Paste a row from the clipboard

Cut, copy, and paste may be used within a transformer, or between transformers.

Filter

Start typing a string, and the matrix will only display rows matching those characters. Searches all columns. This only affects the display of attributes within the transformer - it does not alter which attributes are output.

Import

Import populates the table with a set of new attributes read from a dataset. Specific application varies between transformers.

Reset/Refresh

Generally resets the table to its initial state, and may provide additional options to remove invalid entries. Behavior varies between transformers.

Note: Not all tools are available in all transformers.

For more information, see Transformer Parameter Menu Options.

Reference

Processing Behavior	Feature-Based
Feature Holding	No
Dependencies	None
Aliases	ESRIReprojector
History

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