输出影响点特征的圆形扇区，该点特征具有由方位角定义的方向（从北方顺时针）。
该变换器为每组点特征创建许多扇区（统称为asite), depending on each point’s direction of influence. Each sector fans out from the center point (site point）它属于的网站，并且具有用户定义的半径。
This transformer generates a Voronoi diagram that consists of polygons representing the closest areas around center points of sectors (site points). The final output will be the sectors truncated to the extents of their site’s corresponding Voronoi polygons.
This transformer has an additional output port that produces sectors truncated by Voronoi polygons, to eliminate possible overlaps between different sites.
Note:To create sectors that may overlap with sectors of other sites, use theSectorGeneratortransformer instead.
Input Ports
Input
This transformer accepts only points. All other geometries are rejected.
如果3D点进入此变压器，则它们被视为2D点。
输出端口
SiteSectors
Sector polygons are output unclipped via this port. Output sectors of different sites may overlap each other.
VoronoiPolygons
These are the Voronoi polygons produced by the transformer and used to clip the output polygons of the细胞port.
SitePoints.
For each site, a point is created with coordinates that are the average of the coordinates of all points accepted for that sector. This point is the center of all sectors generated for a site.
ExtraPoints
If a Sector Name Attribute is specified and there are points with the same sector and site names, only the first point meeting all requirements is considered for creating sectors and the rest are output from this port.
遥远的点
在进入变换器时，如果发现某个点远离其站点中的任何其他要点而不是指定Maximum Distance Between Site Points，它将从该端口的扇区生成和输出中删除。
IncompletePoints
这些都是输出点缺失或我nvalid values for required attributes.
IllegalGeom
Non-point features are left untouched and output via this port.
参数
Site Name Attribute
This is the attribute that determines the site to which an input point belongs.
Azimuth Attribute
The direction each input point faces (or influences). The Azimuth Attribute is measured in degrees clockwise from North. Valid Azimuth Attribute values are positive and less than 360.
Sector Name Attribute
如果指定了扇区名称属性并且站点中有相同扇区名称的点，则仅考虑其中一个点来创建扇区。
检查进入变压器的每个功能都被选中。如果它的扇区名称已在其网站中已使用，则会输出它ExtraPointsport.
Radius
This parameter defines the radius of influence for each sector. This determines the radius of each sector in a site.
Note:RADII的值大于站点点覆盖的区域的范围将产生无效结果。用于重叠扇区的半径的不同值也将导致输出不正确。
Maximum Distance Between Site Points
此参数指定一个点从其站点中的任何其他点都可以从扇区创建中考虑的最大距离。
Points are considered in the order they enter the transformer, with each new point tested against all other points already accepted as a part of its site.
If a nonconstant value is specified for this parameter (for example, an attribute value, which may differ from feature to feature), then when comparing the distance between two features, the maximum distance will be calculated from the feature that entered the transformer earlier.
Ensure Topological Correctness
No:There may be slight overlaps or gaps between sectors, making the output unsuitable for some geometric operations.
Note that the input points should be in a way that the transformer is able to produce at least three different site points that are not collinear, since a Voronoi Diagram is generated for analysis.
例子
In the telecommunications industry, directional antennas are used in conjunction with each other for better coverage and stronger signal reception. These antennas each cover a sector of a complete circle that an antenna tower covers, with some areas of overlap between each two sectors.
This transformer can be used to determine the “Nominal” (assuming a whole circle is covered and there are no overlaps between any two sectors) coverage field of directional antennas and receivers.
Input points and their azimuth values are received:
A center point is created for each site:
Note:请注意，在此步骤之后，输入点的位置在生成扇区中播放任何部分，并且确定扇区的值是输入点'方位角和半径。
生成多边形扇区。对应于每个点的扇区将跨越半径集和：的区域
(The point's azimuth + adjacent azimuth (in degrees))/2
Two sides of a sector are found by one time choosing the closest azimuth clockwise and the next time counter-clockwise. Resulting sectors will look like this:
Voronoi polygons are generated, based on site points:
If two sites have overlapping sectors, the sectors are clipped by the Voronoi polygons to generate Cells:
FME许可级别
FME专业版及以上
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, seeTransformer Parameter Menu Options。
Transformer Categories
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