PROJAttributeReprojector

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

Parameters

Transformation Type

Automatic Transformation Parameters

Manual Transformation Parameters

Attributes

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:

EPSG

EPSG:4326

WKT2

GEODCRS["WGS 84",

DATUM["World Geodetic System 1984",

ELLIPSOID["WGS 84",6378137,298.257223563,

LENGTHUNIT["metre",1.0]]],

CS[ellipsoidal,2],

AXIS["latitude",north,ORDER[1]],

AXIS["longitude",east,ORDER[2]],

ANGLEUNIT["degree",0.01745329252],

ID["EPSG",4326]]

PROJ

+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.

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.

FME Community

The FME Community is the place for demos, how-tos, articles, FAQs, and more. Get answers to your questions, learn from other users, and suggest, vote, and comment on new features.

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

Keywords: pointcloud