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PointOnRasterValueExtractor

从每个输入点的位置处从栅格中提取频带和调色板值，并将其设置为特征上的属性。

The following band and palette properties are exposed:

_band{}.value

_band{}.palette{}.value

Note:随时随地“{}”，每个频带或调色板都会有一个属性的一个实例。第一个将出现在{0}，第二个与{1}，等等。

请注意，不会为参考栅格扩展范围之外的点设置任何属性。

参数

变压器

ClosedGroup By

The points may be organized into groups with theGroup By参数，每个点组都有自己的参考光栅。

Closed并行处理

Note:平行处理如何与FME一起使用：见关于并行处理有关详细信息。

此参数确定变压器是否应跨行进程执行工作。如果启用了，将为每个组的组启动一个过程Group Byparameter.

并行处理水平

范围 过程数量
No Parallelism 1
Minimal 核心The 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 确切数量的核心
Aggressive 核心x 1.5
Extreme 核心x 2

例如，在四核机器上，最小的并行性将导致两个同时的FME进程。8核机上的极端并行性将导致16个同时流程。

You can experiment with this feature and view the information in the Windows Task Manager and the Workbench Log window.

Closed输入已订购

No: This is the default behavior. Processing will only occur in this transformer once all input is present.

By Group: This transformer will process input groups in order. Changes on the value of theGroup By输入流上的参数将触发当前累计组上的批处理。如果组很大/复杂，则会提高整体速度，但如果输入组未真正订购，则可能导致不期望的行为。

参数

Closed插值类型

此参数确定在从点检索栅格值时要使用的插值方法。

Nearest Neighbor interpolation is the fastest and least accurate, while Bilinear and Bicubic are slower but will weight surrounding data values into the final result. Average 4 and Average 16 have a performance similar to Bilinear and are useful for numeric rasters such as DEMs.

例子

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, clickbeside the applicable parameter. For more information, see变压器范围Menu Options。

变压器Categories

Rasters

空间分析

FME许可级别

FME专业版及以上

变压器历史

This transformer was previously named PointOnRasterOverlayer.

Search FME Knowledge Center

Search for samples and information about this transformer on theFME知识中心。

标签Keywords: raster band palette vector overlay point interpolate vectorization vectorisation PointOnRasterOverlayer