RasterPaletteNodataSetter
Identifies the palette key that matches a raster band’s nodata value, and sets a value on it.
Typical Uses
- Adding or altering the representation of nodata values on a palette.
How does it work?
The RasterPaletteNodataSetter receives raster features and sets a specified value on the palette key that matches the selected band’s nodata value. That is, if the nodata value is zero (0), it will find the palette entry with a key of zero (0) and change that entry’s value.
栅格带必须具有已设置的Nodata值,并具有调色板。
RGB, RGBA, and string palettes are supported.
This transformer supports raster band and palette selection. Therasterselectorcan be used to modify selection.
In this example, we have a raster with one band and two palettes. Palette 0 represents cell values as an RGB color, and palette 1 represents cell values as a text string. Note the following about the original raster:
- The Nodata Value on the band is zero (0)
- It has both an RGB24 palette and a string palette
- On the string palette. the key value zero (0) does not have an associated string value - it is blank.
We want to set a value on the string palette for nodata.
Cells that fall within the rectangular boundaries of the raster but do not fall within a zone have a value of0, and are considered nodata. They are rendered transparently in the FME Data Inspector. In this particular area (Vancouver), they are generally water.
As the raster has more than one palette, two steps are required:
- Select the palette of interest.
- Set the value.
The raster is first routed into arasterselectortransformer. In the parameters dialog,Selection Modeis set toBand and Palette List.
TheBand and Palette Listis0 1, representing band 0 (the only band in this raster), palette 1 (the second palette, as numbering starts at 0).
The next step is to set the value using a RasterPaletteNodataSetter. In the parameters dialog, we enterUnzonedas the new不data Value.
On the output raster feature, the value of palette key zero (0)在调色板上1现在Unzoned.
Cell values in the nodata region also reflect the new value.
Usage Notes
- This transformer does not alter the nodata value on the band. To set the nodata value on the bands of a raster, use theRasterBandNodataSetter.
Choosing a Raster Transformer
FME has an extensive selection of transformers for working with raster data. They can be generally categorized as working with whole rasters, bands, cells or palettes, and those designed for workflow control or combining raster with vector data.
For information on raster geometry and properties, seeRasters (IFMERaster).
Working with Rasters
RasterCellOriginSetter | Sets the cell origin point within cells in a raster. |
RasterConvolver | Applies a convolution filter (sometimes called akernel或者lens)栅格功能并输出结果。 |
RasterExpressionEvaluator | Evaluates expressions on each cell in a raster or pair of rasters, including algebraic operations and conditional statements. |
RasterExtentsCoercer | Replaces the geometry of input raster features with a polygon covering either the extents of a raster or the extent of data within a raster. |
RasterGCPExtractor | Extracts地面控制点(GCP) coordinate system and point values from a raster feature and exposes them as attributes. |
RasterGCPSetter | Sets地面控制点s(GCPs) on a raster, pairing cell positions with known coordinates. |
RasterGeoreferencer | Georeferences a raster by either known corner coordinates or origin, cell size, and rotation. |
RasterHillshader | Generates a grayscale shaded relief representation of terrain, based on elevation values. |
RasterInterpretationCoercer | Alters the interpretation type of rasters, including all bands, and converts cell values if necessary. |
RasterMosaicker | Merges multiple raster features into a single raster feature. |
RasterPropertyExtractor | 提取一个光栅的几何性质特点re and exposes them as attributes. |
RasterPyramider | Resamples rasters to multiple resolutions, based on either number of levels or dimensions of the smallest output raster. |
RasterRegisterer | Transforms an image to minimize its difference with another. |
RasterResampler. | Resamples rasters, based on specified output dimensions, cell size in ground units, or percentage of original, and interpolates new cell values. |
RasterRotationApplier | Rotates a raster feature according to its rotation angle property, interpolating new cell values, updating all other affected raster properties, and producing an output raster feature with a rotation angle of zero. |
RasterSharpener | Enhances the features of a raster image. The RasterSharpener enhances the borders, lines, and curves while reducing noise in the flat areas of the raster image. |
RasterSubsetter | Clips raster features using pixel bounds instead of ground coordinates, and optionally adds cells around the perimeter. |
rastertiler. | Splits each input raster into a series of tiles by specifying either a tile size in cells/pixels or the number of tiles. |
RasterToPolygonCoercer | Creates polygons from input raster features. One polygon is output for each contiguous area of pixels with the same value in the input raster. |
WebMapTiler | Creates a series of image tiles that can be utilized by web mapping applications such as Bing™ Maps, Google Maps™, or Web Map Tile Service. This is done by resampling rasters to various different resolutions and then splitting them into tiles. |
Working with Bands
RasterBandAdder | Adds a new band to a raster feature. |
RasterBandCombiner | Merges coincidental raster features into a single output raster feature, preserving and appending all bands. |
RasterBandInterpretationCoercer | Alters the interpretation type of individual raster bands, converting cell values if necessary. |
RasterBandKeeper | Removes all unselected bands from a raster feature. |
RasterBandMinMaxExtractor | Extracts the minimum and maximum band values, palette keys, and palette values from a raster feature, and adds them to a list attribute. |
Rasterbandnamesetter. | 将所选频段的频带名称设置在栅格上,与频带数字相比,使栅格内容更加简单地理解。 |
RasterBandNodataRemover | Removes the existing nodata identifier from selected bands of a raster feature. Any values previously equal to the nodata value are considered valid data. |
RasterBandNodataSetter | Sets a new nodata value on selected bands of a raster feature. |
RasterBandOrderer | Specifies the required order of bands in a raster. Bands are reordered according to the input band indices. |
RasterBandPropertyExtractor. | Extracts the band and palette properties of a raster feature and exposes them as attributes. |
RasterBandRemover | Removes any selected bands from a raster feature. |
RasterBandSeparator | Separates bands or unique band and palette combinations, and outputs either individual raster features or a single new raster feature containing all combinations. |
RasterStatisticsCalculator | Calculates statistics on raster bands and adds the results as attributes. |
Working with Cells
RasterAspectCalculator | Calculates the aspect (direction of slope) for each cell of a raster. Aspect is measured in degrees from 0 to 360, clockwise from north. |
RasterCellCoercer | 为栅格中的每个单元格创建各个点或多边形,可选地将频带值提取为z坐标或属性。 |
RasterCellValueCalculator | Evaluates basic arithmetic , minimum, maximum or average operations on the cell values of a pair of rasters. |
RasterCellValueReplacer | Replaces a range of band values in a raster with a new single value. |
RasterCellValueRounder | Rounds off raster cell values. |
RasterSegmenter | Partitions a raster image into arbitrarily sized groups of cells from the input image based on intensity differences in the input raster image cells. |
RasterSingularCellValueCalculator | Performs basic arithmetic operations on the cell values of a raster against a numeric value. |
rasterslopecalculator. | Calculates the slope (maximum rate of change in z) for each cell of a raster. |
Working with Palettes
RasterPaletteAdder | Creates a palette from an attribute, and adds this palette to all selected bands on a raster. |
RasterPaletteExtractor | Creates a string representation of an existing palette on a raster and saves it to an attribute. |
RasterPaletteGenerator | Generates a palette out of the selected band(s) of a raster. The output raster will have the selected band(s) replaced by a new band with a palette. |
RasterPaletteInterpretationCoercer | Alters the interpretation type of raster palettes. |
RasterPaletteNodataSetter | Identifies the palette key that matches a raster band’s nodata value, and sets a value on it. |
RasterPaletteRemover | Removes selected palette(s) from raster features. |
RasterPaletteResolver | Resolves the palette(s) on a raster by replacing cell values with their corresponding palette values. Palette values with multiple components, such as RGB, are broken down and the individual values assigned to multiple, newly-added bands. |
Workflow Control
RasterCheckpointer | Forces accumulated raster operations to be processed, saving the state to disk and releasing resources to tune performance or assist with memory limitations. |
RasterConsumer | Reads raster features for testing purposes, including any accumulated raster operations. No additional operations are performed, and nothing is done with the features. |
RasterExtractor | Serializes the geometry of a raster feature into a Blob attribute, encoding the contents according to a choice of common binary raster formats. |
RasterNumericCreator | Creates a numeric raster of specified size and resolution, with default cell values. |
RasterReplacer | Decodes a binary attribute containing encoded rasters stored as Blobs, replacing the feature’s geometry with the decoded raster. |
RasterRGBCreator | Creates a color raster feature of specified size, resolution, and interpretation type, with default cell values. |
rasterselector | Selects specific bands and palettes of a raster for subsequent transformer operations. |
Vectors and Rasters
ImageRasterizer | Creates a raster representation of vector or point cloud input features, using the fme_color attribute over a solid background fill for vector features. Point clouds may be rendered using their color or intensity components. |
NumericRasterizer | Creates a numeric raster representation of vector or point cloud input features, where cell values are taken from the z coordinates of the input features and overlaid on a uniform background. |
MapnikRasterizer | Generates a raster from input vector and raster features, with fine control over symbolization and labeling, using the Mapnik toolkit. |
PointOnRasterValueExtractor | Extracts the band and palette values from a raster at the location of one or more input points and sets them as attributes on the feature. |
RasterDEMGenerator | Produces a raster digital elevation model (DEM) by uniformly sampling a Delaunay triangulation generated from input points and breaklines. |
VectorOnRasterOverlayer | Rasterizes vector or point cloud features onto an existing raster. For vector features the fme_color attribute sets pixel color, and point clouds may be rendered using their color or intensity components. |
配置
输入端口
此变形器仅接受栅格功能。频段必须设置Nodata值设置,并具有一个或多个调色板。
Output Ports
Raster features with the specified value set on the palette key that matches the raster band’s nodata value.
不n-raster features will be routed to the
Rejected features will have an fme_rejection_code attribute with one of the following values:
INVALID_GEOMETRY_TYPE
Invalid_raster_no_bands.
Rejected Feature Handling:can be set to either terminate the translation or continue running when it encounters a rejected feature. This setting is available both as a defaultFME optionand as aworkspace parameter.
Parameters
不data Value | A numeric or string value specifying the nodata value to be set on the palette. Multi-part interpretations such as RGB or RGBA may be specified as a comma-separated value (for example,10,0,255). The palette’s original nodata value is overwritten if one exists. |
Editing Transformer Parameters
使用一组菜单选项,可以通过引用工作区中的其他元素来分配变压器参数。一些变压器也可提供更高级的功能,例如高级编辑器和算术编辑器。要访问这些选项的菜单,请单击除适用的参数旁边。有关更多信息,请参阅Transformer Parameter Menu Options.
定义值
有几种方法来定义一个值供我使用n 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.
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.
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. |
Reference
Processing Behavior |
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Feature Holding |
不 |
Dependencies | 不ne |
FME Licensing Level | FME Professional Edition and above |
Aliases | |
History | |
Categories |
FME Community
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Examples may contain information licensed under the Open Government Licence – Vancouver