Calculates the distance between a number of input vector lines and the elevation values of a reference DEM raster, and outputs a new DEM raster per input line.
The data contained in the resulting DEM consists of the 3D distance between the line being considered and the corresponding point on the reference DEM.
A reference DEM raster. Only the first raster feature received for each Group By grouping will be used.
3D line features.
Raster DEMs representing the 3D distance between a line and the corresponding point on the reference DEM.
Any input features entering the Line port that are not 3D lines will be rejected with the fme_rejection_code attribute set to 3D_LINE_REQUIRED.
Any input features entering the RefDem port that are not valid DEM rasters will be rejected with the fme_rejection_code attribute set to INVALID_REFERENCE_DEM.
If more than one DEM raster is received for a Group By grouping, the extra rasters will be rejected with the fme_rejection_code attribute set to EXTRA_REFERENCE_DEM.
Use this parameter to organize lines into groups, with each group of lines having its own reference DEM.
Note: How parallel processing works with FME: see About Parallel Processing for detailed information.
This parameter determines whether or not the transformer should perform the work across parallel processes. If it is enabled, a process will be launched for each group specified by the Group By parameter.
Parallel Processing Levels
For example, on a quad-core machine, minimal parallelism will result in two simultaneous FME processes. Extreme parallelism on an 8-core machine would result in 16 simultaneous processes.
You can experiment with this feature and view the information in the Windows Task Manager and the Workbench Log window.
Yes: This transformer will process input groups in order. Changes on the value of the Group By parameter on the input stream will trigger batch processing on the currently accumulating group. This will improve overall speed if groups are large/complex, but could cause undesired behavior if input groups are not truly ordered.
No: This is the default behavior. Processing will only occur in this transformer once all input is present.
This transformer supports raster band and palette selection. The RasterSelector can be used to modify selection.
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.
FME Licensing Level
FME Professional edition and above
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Tags Keywords: raster band palette vector distance DEM