Generic (Any Format) Writer Parameters
FME can reroute output to any FME writer dynamically when a translation is run. The name of the true writer is supplied in the Output Format parameter.
The Generic writer operates independent of output format, and is very useful for solving problems where the schemas and transformations are known at design time, but the output format is not.
Writer Parameters
Select the format that will be used at runtime to output the data.
If at run time, the Generic writer is instructed to output to a format that requires an output filename, the Generic writer will turn the output folder into a filename by appending the last portion of the folder name and the most common file extension (as read from the FME formats database) to the folder.
For example, if at runtime the Generic writer dataset was c:/data/roads, and the Output Format chosen above was Bentley Microstation Design, then by default it would pass the output dataset c:/data/roads/roads.dgn to the Design file writer that it would employ to do the actual writing.
Enter a base filename for the output feature types.
FME Flow Parameters
By adjusting this setting, the user is communicating to, and storing in the workspace, information on how the text file will be streamed back if it is used in the streaming service.
The valid values for this parameter include all valid MIME types. Several common types are listed and others can be entered as text strings.
Spatial
Coordinate systems may be extracted from input feature data sources, may come predefined with FME, or may be user-defined. FME allows different output and input coordinate systems, and performs the required coordinate conversions when necessary.
If a coordinate system is specified in both the source format and the workspace, the coordinate system in the workspace is used. The coordinate system specified in the source format is not used, and a warning is logged. If a source coordinate system is not specified in the workspace and the format or system does not store coordinate system information, then the coordinate system is not set for the features that are read.
If a destination coordinate system is set and the feature has been tagged with a coordinate system, then a coordinate system conversion is performed to put the feature into the destination system. This happens right before the feature enters into the writer.
If the destination coordinate system was not set, then the features are written out in their original coordinate system.
If a destination coordinate system is set, but the source coordinate system was not specified in the workspace or stored in the source format, then no conversion is performed. The features are simply tagged with the output system name before being written to the output dataset.
For systems that know their coordinate system, the Coordinate System field will display Read from Source and FME will read the coordinate system from the source dataset. For most other input sources, the field will display Unknown (which simply means that FME will use default values). In most cases, the default value is all you'll need to perform the translation.
You can always choose to override the defaults and choose a new coordinate system. Select More Coordinate Systems from the drop-down menu to open the Coordinate System Gallery.
Changing a Reprojection
To perform a reprojection, FME typically uses the CS-MAP reprojection engine, which includes definitions for thousands of coordinate systems, with a large variety of projections, datums, ellipsoids, and units. However, GIS applications have slightly different algorithms for reprojecting data between different coordinate systems. To ensure that the data FME writes matches exactly to your existing data, you can use the reprojection engine from a different application.
To change the reprojection engine, Select Workspace Parameters > Spatial > Reprojection Engine. In the example shown, you can select Esri (but the selection here depends on your installed applications):
- The coordinate systems file coordsys.db in the FME installation folder contains the names and descriptions of all predefined coordinate systems.
- Some users may wish to use coordinate systems that do not ship with FME, and in those cases, FME also supports custom coordinate systems.
- Learn more about Working with Coordinate Systems in FME.