RasterSubsetter

例子：子集ting a raster and adding cell padding

In this example, we will extract a portion of a raster image, and add a frame of empty cells around it. Note that the original image is 1600 x 1000 pixels.

The raster is routed into a RasterSubsetter.

子集将从列300，行300开始，并且将是500像素的方形。我们还在左侧，顶部和右侧添加细胞填充 - 100像素，底部有更宽的300像素填充。

The output feature is the raster subset, including the padding. Note the new dimensions include both the 500 x 500 cropped image, plus the specified padding.

The output raster, including padding, compared to the extents of the original image:

Raster Transformers

与罗斯特合作

这些变压器通常适用于整个栅格。

RasterCellOriginSetter	Sets the cell origin point within cells in a raster.
RasterConvolver	Applies a convolution filter (sometimes called akernelorlens) to raster features and outputs the results.
RasterExpressionEvaluator	评估栅格或一对栅格中的每个单元格的表达式，包括代数操作和条件陈述。
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地面控制器l Point（GCP）来自栅格功能的坐标系和点值，并将其视为属性。
RasterGCPSetter	Sets地面控制器l Points（GCPS）在光栅上，用已知坐标配对单元位置。
RasterGeoreferencer	Georeferences a raster by either known corner coordinates or origin, cell size, and rotation.
RasterHillshader	基于高程值，生成地形的灰度阴影浮雕表示。
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.	提取栅格功能的几何属性并将其视为属性。
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.	增强光栅图像的特征。Rastersharpener增强边界，线条和曲线，同时降低光栅图像的平坦区域中的噪音。
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.
范特利奥戈翁塞纳克	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	创建一系列可通过Web映射应用程序使用的图像块，例如Bing™Maps，Google Maps™或Web地图图块服务。这是通过重新采样仪器来完成各种不同分辨率的，然后将它们拆分为瓷砖。

与乐队一起使用

这些变压器通常适用于带。

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	改变单个光栅带的解释类型，如有必要，转换单元值。
RasterBandKeeper	从栅格功能中删除所有未选择的频带。
Rasterbandminmaxxtractor.	Extracts the minimum and maximum band values, palette keys, and palette values from a raster feature, and adds them to a list attribute.
RasterBandNameSetter	Sets 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	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.	从栅格功能中删除任何选定的频段。
RasterBandSeparator	将频带或唯一频带和调色板组合分开，并输出单个栅格功能或包含所有组合的单个新栅格功能。
RasterStatisticsCalculator	Calculates statistics on raster bands and adds the results as attributes.

Working with Cells

Working with Palettes

Workflow Control

Vectors and Rasters

输入

此变形器仅接受栅格功能。

Output

One subsetted raster per input raster feature.

Non-raster features will be routed to the port, as well as invalid rasters.

Rejected features will have an fme_rejection_code attribute with one of the following values:

Invalid_geometry_type.

INVALID_RASTER_NO_BANDS

INVALID_RASTER_CANNOT_SUBSET

Rejected Feature Handling:可以设置为终止翻译或在遇到被拒绝的功能时继续运行。此设置可用作默认设置FME option和A.工作区参数.

子集

These parameters specify the position and size of the subset, in cells (pixels), to be taken from the raster. They do not include any padding values.

Start Column	The position of the starting pixel (x-axis) for the subset. Pixels are counted rightwards from the upper left point of origin.
Number of Columns (cells)	The number of cells (pixels) to include to the right of the Start Column.
Start Row	The position of the starting pixel (y-axis) for the subset. Pixels are counted downwards from the upper left point of origin.
行数（单元格）	The number of cells (pixels) to include below the Start Row.

Padding

这些参数指定了在栅格的子集部分周围应放置多个小区中的填充的行数和列。

Number of Top Padding Rows (cells)	The number of cells (pixels) to add above the subset raster.
Number of Left Padding Columns (cells)	The number of cells (pixels) to add to the left of the subset raster.
Number of Bottom Padding Rows (cells)	The number of cells (pixels) to add below the subset raster.
Number of Right Padding Columns (cells)	The number of cells (pixels) to add to the right of the subset raster.

如何设置参数值

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.

Text Editor

Using the Arithmetic Editor

算术编辑器提供了一种方便的方法来构建来自各种数据源的数学表达式，例如属性，参数和特征函数，其中结果直接在参数内使用。

Arithmetic Editor

Conditional Values

Set values depending on one or more test conditions that either pass or fail.

Parameter Condition Definition Dialog

Content

表达式和字符串可以包括许多函数，字符，参数等。

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.

Table Tools

行重新排序

Enabled once you have clicked on a row item. Choices include:

Add a row
Remove a row
Move current row up one
Move current row down one
Move current row to top
Move current row to bottom

Cut, Copy, and Paste

Enabled once you have clicked on a row item. Choices include:

剪裁 - 删除并复制到剪贴板
Copy a row to the clipboard
Paste a row from the clipboard

Cut, copy, and paste may be used within a transformer, or between transformers.

Filter

Start typing a string, and the matrix will only display rows matching those characters. Searches all columns. This only affects the display of attributes within the transformer - it does not alter which attributes are output.

Import

Import populates the table with a set of new attributes read from a dataset. Specific application varies between transformers.

Reset/Refresh

Generally resets the table to its initial state, and may provide additional options to remove invalid entries. Behavior varies between transformers.

Note:Not all tools are available in all transformers.

RasterAspectCalculator	计算光栅的每个单元的方面（斜率方向）。方面以从北方顺时针的0到360测量。
RasterCellCoercer	Creates individual points or polygons for each cell in a raster, optionally extracting band values as z coordinates or attributes.
RasterCellValueCalculator	Evaluates basic arithmetic , minimum, maximum or average operations on the cell values of a pair of rasters.
RasterCellValueReplacer	用新的单个值替换栅格中的一系列频带值。
RasterCellValueRounder	Rounds off raster cell values.
RasterSegmenter	基于输入光栅图像单元中的强度差，将光栅图像分配到从输入图像中的任意大小的小区组。
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.

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	从光栅的选定频段中生成调色板。输出栅格将使所选频段由带有调色板的新频段替换。
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	通过用相应的调色板值替换单元值来解析栅格上的调色板。具有多个组件（如RGB）的调色板值被分解，并且分配给多个新添加频段的单个值。

RasterCheckpointer	强制累计覆盖栅格操作要处理，将状态保存到磁盘并释放资源以调整性能或协助内存限制。
RasterConsumer	读取用于测试目的的栅格功能，包括任何累计光栅操作。没有执行额外的操作，没有任何内容功能。
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	创建指定大小和分辨率的数字栅格，具有默认单元格值。
RasterReplacer	解码包含存储为Blobs的编码栅格的二进制属性，用解码栅格替换要素的几何图形。
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.

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.
Mapnikerasterizer.	从输入向量和光栅功能生成光栅，使用MapNik Toolkit对符号化和标签进行精细控制。
PointCloudonRasterComponentsEtter.	Sets point cloud component values by overlaying a point cloud on a raster. The component values for each point are interpolated from band values at the point location.
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.

String Functions	These functions manipulate and format strings.
Special Characters	文本编辑器中提供了一组控制字符。
数学函数	Math functions are available in both editors.
Date/Time Functions	文本编辑器中提供日期和时间函数。
数学运营商	这些运算符可在算术编辑器中使用。
FME Feature Functions	These return primarily feature-specific values.
FME Parameters	FME and workspace-specific parameters may be used.
Creating and Modifying User Parameters	Create your own editable parameters.

Typical Uses

它是如何工作的？

例子

Usage Notes

Choosing a Raster Transformer

配置

输入Ports

输出端口

Parameters

Editing Transformer Parameters

Defining Values

Dialog Options - Tables

参考

FME Community

Processing Behavior	Feature-Based
Feature Holding	No
Dependencies	没有任何
FME Licensing Level	FME Professional Edition and above
Aliases
History