Example:
Point file
Attribute: Mapsheet
Polygon file
Attribute: WMS_Mapsheet
I would like to populate the Mapsheet attribute from the Polygons WMS_Mapsheet based on the spatial relation the points are contained within the polygon.
Populate one attribute based on spatial overlap to existing attribute
I'm trying to populate an attribute value from one feature to the next based what points are contained by certain areas. I am using the SpatialRelator to find all my points that overlap my polygon, then I would like to map the value from my polygon onto the points existing Attirbute. I have connected an AttributeValueMapper transformer to the output of my Spatial Relator but it does not seem to overwrite or transfer the attrubtes?
Userlevel 2
+17
- Contributor
- 7538 replies
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26 November 2013
Hi,
Output features from the SpatialRelator will contain attributes of related CANDIDATE features as a complex list attribute named "_relationships" by default. For example, if you send points to BASE port and send polygons to CANDIDATE port, each output point will have "_relationships{}.WMS_Mapsheet" when one or more polygons are related spatially. Since output features also have "_related_candidates" (default name) attribute which indicates the number of related CANDIDATE features (0 or more), you can see how many CANDIDATE features are related with this attribute.
In addition, if a point cannot be related to multiple polygons simultaneously (in other words, polygons are not overlapped each other), you can also consider using the SpatialFilter.
Takashi
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