Converts a given angle from one coordinate system to another. The transformer uses the first coordinate of the passed-in feature and returns the angle of the specified line at the determined angle in the destination coordinate system. It is useful for converting data such as text rotations that are established in many systems in the destination coordinate system units.
To calculate the new angle, the transformer uses the:
- input length
- input angle
- input point
- source (reader) coordinate system
- destination (writer) coordinate system
and then calculates a second point in the source coordinate system by taking the first point and advancing length units in the angle heading. It then reprojects both points to determine the new angle.
Usage Notes
This function assumes all coordinate systems are Cartesian.
Parameters
Original Line Length
Distance specified in source coordinate system coordinates. You should enter a length that is small enough to avoid distortion, but large enough to get meaningful results (for example, 1 m might be a good choice, although a range of 1 cm to 100 m would be acceptable). If your source system is in degrees, you will have to adjust the length to produce measurable results.
Original Line Angle
Angle of distance in source coordinate system. The angle is measured counterclockwise from horizontal and is specified in degrees.
Source and Destination Coordinate Systems
The name of the reader and writer coordinate systems.
Reprojected Angle Attribute
The calculated value is put into the attribute specified by the Reprojected Angle Attribute parameter.
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.
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.
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
| These functions manipulate and format strings. | |
|
Special Characters |
A set of control characters is available in the Text Editor. |
| Math functions are available in both editors. | |
| Date/Time Functions | Date and time functions are available in the Text Editor. |
| These operators are available in the Arithmetic Editor. | |
| These return primarily feature-specific values. | |
| 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:
|
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Cut, Copy, and Paste
|
Enabled once you have clicked on a row item. Choices include:
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
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Import populates the table with a set of new attributes read from a dataset. Specific application varies between transformers. |
|
Reset/Refresh
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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
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Search for samples and information about this transformer on the FME Community.