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NumericRasterizer

Draws input point, line and polygon features onto a numeric raster filled with the background value. The Z coordinates of the input vector features are used to generate pixel values. Features without Z coordinates will be discarded.

Note: Only the Group By attributes are preserved by this transformer. The output feature will also be supplied with an fme_basename attribute equal to the transformer name.

Parameters

ClosedGroup By

If the Group By parameter is set to an attribute list, one raster per group will be produced.

ClosedParallel Processing Level

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

Parameter Number of Processes
No Parallelism 1
Minimal coresThe processor, or CPU, is the physical part of the computer that performs mathematical calculations. It is the most important part of a computer system. Traditional processors have only one core on the processor, meaning that at any given time, only one set of calculations is being performed. If a processor is dual-core, this means the single chip contains hardware for two processors, now called cores to distinguish them from the single chip, running simultaneously, side by side. (Source: http://www.ehow.com/facts_5730257_computer-core-processors_.html) / 2
Moderate exact number of cores
Aggressive cores x 1.5
Extreme cores x 2

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.

ClosedInput is Ordered by Group

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.

Raster Properties

ClosedSize Specification, Number of Columns (cells), Number of Rows (cells), X Cell Spacing, Y Cell Spacing

To set the size of the output raster, specify either the dimensions or the cell size.

To set the output raster size using dimensions, set the Size Specification to RowsColumns and specify values for both the Number of Columns and Number of Rows.

To set the output raster size using cell size, set the Size Specification to CellSize and specify values for both the X Cell Spacing and Y Cell Spacing.

Interpretation

ClosedInterpretation Type

Sets the interpretation of the output raster.

Background

ClosedBackground Value

Sets the background value of the raster.

ClosedFill Background with Nodata

If this is set to Yes, the background value will also be flagged as the nodata value for the produced band.

Anti-Aliasing

ClosedAnti-Aliasing

If the Anti-Aliasing parameter is Yes, the output lines will be smoothed using an anti-aliasing algorithm.

ClosedTolerance

This parameter is the maximum normalized distance from a line segment or polygon vertex to a pixel to be rendered. For example a tolerance of 1.0 will draw all pixels touched by the input vector line, while a tolerance of 0.0 will draw only those pixels where the input vector line passes directly through their center. Tolerance can only be selected when anti-aliasing is off.

Ground Extents

ClosedGround Extents

If the Ground Extents parameter is set to Use input data ground extents, which means the extents are not explicitly specified, the output raster extents will be determined by the union of the bounding boxes of the valid input vector features. If the Ground Extents parameter is set to Specify ground extents, the remaining Ground Extents parameters are used to specify the extents of the output raster.

Note: Note: The raster extent is absolute, measured from the outer edges of the border row and column pixels.

ClosedMinimum X

This specifies the minimum x value of the output raster. It is used when the Ground Extents parameter is set to Specify ground extents.

ClosedMinimum Y

This specifies the minimum y value of the output raster. It is used when the Ground Extents parameter is set to Specify ground extents.

ClosedMaximum X

This specifies the maximum x value of the output raster. It is used when the Ground Extents parameter is set to Specify ground extents.

ClosedMaximum Y

This specifies the maximum y value of the output raster. It is used when the Ground Extents parameter is set to Specify ground extents.

Related Transformers

This transformer is intended for producing elevation rasters. For producing color images, use the ImageRasterizer instead.

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.

Transformer Categories

Rasters

FME Licensing Level

FME Professional edition and above

 

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Tags Keywords: MBR "minimum bounding rectangle" pointcloud