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. Selecting a transformation will also set the Geographic Transformation Direction appropriately.

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.

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.

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.

Working With Coordinate System Transformers

FME inherently supports coordinate system transformations and reprojections, using the CS-Map coordinate system library.

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.

Coordinate System Support

These transformers perform various coordinate system-related tasks, but do not reproject the data. If a coordinate system library is required for a task, CS-Map is used.

CoordinateSystemDescriptionConverter	Converts 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 FME coordinate system name of the feature 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, use CS-Map. A selection of other libraries is also available, some of which are specific to certain areas of the world or certain software platforms.

Default reprojections, as in a workspace with different input and output coordinate systems selected, are performed with the CS-Map library, also the equivalent of using the generic Reprojector transformer.

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, the library is 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.	CS-Map
CommonLocalReprojector	Reprojects one or more features to a local coordinate system centered on the bounding box containing all features.	CS-Map
ReprojectAngleCalculator	Converts a given angle from one coordinate system to another.	CS-Map
ReprojectLengthCalculator	Converts a given distance from one coordinate system to another.	CS-Map
Reprojector	Reprojects feature x and y coordinates from one coordinate system to another.	CS-Map

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 reprojection library. This library allows you to use the GridInQuestIIReprojector to transform coordinates between ETRS89 (WGS84) and the national coordinate systems of Great Britain, Northern Ireland and the Republic of Ireland.	Grid InQuestII
GtransAttributeReprojector Sweden	Reprojects attributes holding coordinate values from one coordinate system to another using the Gtrans reprojection library (from the National Land Survey of Sweden), and the specified translation file.	Gtrans
GtransReprojector Sweden	Reprojects features from one coordinate system to another using the Gtrans reprojection library (from the National Land Survey of Sweden) and the specified translation file.	Gtrans
PROJAttributeReprojector	Reprojects 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 using the REFRAME library. This transformer handles the usual planimetric and altimetric reference frame change for Switzerland.	REFRAME

Configuration

Input Ports

Output Ports

Parameters

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.
Geographic Transformation Direction	The direction in which the Geographic Transformation is being used - either Forward or Reverse. This parameter is set automatically when a Geographic Transformation is chosen.

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.

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.

How to Set Parameter Values

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

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

Table Tools

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.

Reference

Processing Behavior	Feature-Based
Feature Holding	No
Dependencies	None
FME Licensing Level	FME Base Edition and above
Aliases	ESRIReprojector
History

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