计算栅格频段的统计信息，并将结果添加为属性。
典型的用途
- 检查和分析光栅功能
- 检查其他变形金刚的结果，如rasterexpressionEvaluator.orRasterSingularCellValueCalculator
- Calculating statistics for use in further operations
How does it work?
RasterStatisticsCalculator接收栅格功能，并单独计算它们的选定统计信息。结果在每个光栅上输出，并且可以为频带，调色板或两者生成。
可用统计数据包括：
- Minimum
- Maximum
- Mean
- 和
- Range
- Standard Deviation
- 中位数
- Mode
乐队statistics are stored as attributes, named
Palette statistics are calculated on resolved palette values, and are stored aslist attributes，命名
为了both types of attribute,
为了multi-band rasters，必须在参数对话框中列入频带0之外的任何附加频带 -统计数据to Calculate表，下面乐队Index。
To calculate raster statistics on a group of rasters as a single entity, merge them prior to this transformer with theRasterBandCombinerorRasterMosaicker。
Example:Calculating statistics on a DEM
In this example, we will generate some statistics on an elevation raster. The source data has elevation values (in meters) stored in Band 0.
The DEM is routed into a RasterStatisticsCalculator.
在“参数”对话框中，Raster Level Statisticsis set to乐队。By default,乐队索引0.is included in the统计数据to Calculatetable, and we choose our desired statistics.
The output feature has new attributes containing the requested statistics. Note that the entire raster is selected here, not an individual cell.
选择光栅变压器
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.
为了information on raster geometry and properties, seeRasters (IFMERaster)。
光栅变压器
Working with Rasters
These transformers generally apply to whole rasters.
| RasterCellOriginSetter | 将单元格源点设置在栅格中的单元格中。 |
| RasterConvolver. | Applies a convolution filter (sometimes called a核心orlens) to raster features and outputs the results. |
| 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 | 提取物地面控制点(GCP) coordinate system and point values from a raster feature and exposes them as attributes. |
| Rastergcpsetter. | 套地面控制点s(GCPs) on a raster, pairing cell positions with known coordinates. |
| RastergeoreFerencer. | 通过已知的角落坐标或起源，单元格尺寸和旋转来绕地理栅格。 |
| Rasterhillsshader. | 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 | 将多个栅格功能合并到单个栅格功能中。 |
| RasterPropertyExtractor | 提取物the geometry properties of a raster feature and exposes them as attributes. |
| Rasterpyramider. | 基于最小输出光栅的任一数量或尺寸，将栅格重新列出到多个分辨率。 |
| RasterRegisterer | 转换图像以最小化其与另一个的差异。 |
| RasterResampler | Resamples rasters, based on specified output dimensions, cell size in ground units, or percentage of original, and interpolates new cell values. |
| RasterRotationApplier | 根据其旋转角度旋转栅格功能，内插新的单元格值，更新所有受影响的栅格属性，并使用旋转角度产生输出栅格功能。 |
| 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
These transformers generally apply to bands.
| RasterBandadder. | 将新频段添加到栅格功能。 |
| 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. |
| Rasterbandeepter | Removes all unselected bands from a raster feature. |
| RasterBandMinMaxExtractor | 提取物the minimum and maximum band values, palette keys, and palette values from a raster feature, and adds them to a list attribute. |
| RasterBandNameSetter | 套the band name of selected bands on a raster, making raster contents simpler to understand compared to band numbers. |
| 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. | 套a new nodata value on selected bands of a raster feature. |
| RasterBandorder | 指定栅格中的频带所需顺序。频带根据输入带索引重新排序。 |
| RasterBandPropertyExtractor | 提取物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 | 计算栅格频段的统计信息，并将结果添加为属性。 |
Working with Cells
这些变压器通常适用于单个细胞。
| 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. | Creates individual points or polygons for each cell in a raster, optionally extracting band values as z coordinates or attributes. |
| RasterCellValueCalculator | 评估基本的算术,最小值,最大值或verage 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. |
| 罗斯特司人 | 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 | 计算栅格的每个单元格的斜率（z的最大变化率）。 |
Working with Palettes
These transformers generally apply to palettes.
| RasterPaletteAdder | Creates a palette from an attribute, and adds this palette to all selected bands on a raster. |
| RasterPaletteExtractor | 在栅格上创建现有调色板的字符串表示，并将其保存到属性。 |
| 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. | 改变光栅调色板的解释类型。 |
| RasterPaletteNodataSetter | 标识与栅格乐队的Nodata值匹配的调色板键，并设置一个值。 |
| RasterPaletteRemover | 从栅格功能中删除选定的调色板。 |
| 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
These transformers generally control the flow of features in a workspace.
| RastercheckPointer. | 为了ces 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
These transformers generally involve using rasters and vector data together.
| ImageRasterizer. | 使用纯背景填充的FME_COLOR属性填充矢量功能，创建矢量或点云输入功能的光栅表示。可以使用颜色或强度分量呈现点云。 |
| NumericRasterizer | 创建矢量或点云输入特征的数字栅格表示，其中从输入特征的z坐标中取出单元值并覆盖在均匀的背景上。 |
| MapnikRasterizer | Generates a raster from input vector and raster features, with fine control over symbolization and labeling, using the Mapnik toolkit. |
| PointOnRasterValueExtractor | 提取物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. | 将矢量或点云功能光栅化到现有的光栅上。对于向量特征，FME_Color属性设置像素颜色，可以使用它们的颜色或强度分量呈现点云。 |
配置
Input Ports
Input
This transformer accepts only raster features. Palettes are supported.
输出Ports
输出
Raster features with the specified calculated statistics.
乐队statistics are stored as standard attributes, and Palette statistics are stored aslist attributes。
非栅格功能将被路由到<拒绝>端口以及无效的栅格。
被拒绝的功能将有一个fme_rejection_codeattribute with one of the following values:
INVALID_GEOMETRY_TYPE
INVALID_RASTER_NO_BANDS
Invalid_raster_cannot_create_point_cloud.
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选项and as aworkspace parameter。
参数
Options
| Raster Level Statistics | Specifies for all bands chosen: whether to calculate statistics on band values, resolved palette values, or both. If乐队is selected and a band with palette(s) is encountered, statistics will be calculated on the band’s cell values. IfPalette被选中，遇到没有调色板的频带，将为该频段计算统计信息。 If乐队and Palette被选中，将计算统计数据的频段，没有调色板，带调色板的频带将计算解析的调色板值和单元值。 |
统计数据to Calculate
Specifies which statistics to calculate for each band.
| 乐队Index | 频段由其索引号指定，从0开始。 乐队0 is included by default, and any additional bands must be explicitly specified for inclusion. |
||||||||||||||||
| 统计数据 | The following statistics may be calculated:
|
编辑变压器参数
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, seeTransformer Parameter Menu Options。
Defining Values
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.
How to Set Parameter Values
Using the Text Editor
文本编辑器提供了一种方便的方法来构建来自各种数据源的文本字符串（包括正则表达式），例如属性，参数和常量，其中结果直接在参数内使用。
使用算术编辑器
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.
条件值
根据通过或失败的一个或多个测试条件设置值。
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>）不应用作文字字符串值。
Content Types
| 这些功能操纵和格式化字符串。 | |
特殊的角色 |
A set of control characters is available in the Text Editor. |
| Math functions are available in both editors. | |
| 日期/时间函数 | Date and time functions are available in the Text Editor. |
| These operators are available in the Arithmetic Editor. | |
| 这些主要是特定于特征的值。 | |
| FME and workspace-specific parameters may be used. | |
| Creating and Modifying User Parameters | Create your own editable parameters. |
Reference
Processing Behavior |
|
功能持有 |
No |
| 依赖性 | None |
| FME许可级别 | FME专业版及以上 |
| 别名 | |
| 历史 | |
| 类别 |
FME Community
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Examples may contain information licensed under the Open Government Licence – Vancouver