Hi,
How could I assign a value to a polygon based on the value of most of the overlapping points?
Thanks in advance.
Best answer by takashi
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Userlevel 2
+17
- Contributor
- 7538 replies
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22 January 2022
- Best Answer
Hi @ortegago , a possible way I can think of is:
Counter: Add sequential number attribute (say "polygon ID") as unique ID to every polygon.
SpatialFilter (polygons->Filter, points->Candidate): Transfer polygon ID to every point within the polygon.
StatisticsCalculator (Group By: polygon ID, point No): Count the number of points for each group consisting of points having the same polygon ID and the same point No.
Sorter (Group By: polygon ID, Sort By: number of points, numeric descending): Sort the features output from Summary port of the StatisticsCalculator.
DuplicateFilter (Key Attributes: polygon ID): Select the first feature for each polygon ID. Selected feature will have your desired point No for the polygon.
FeatureMerger (Join On: polygon ID): Merge the point No to the original polygon feature.
See the attached screenshot to learn more.
Note the workflow has to be a little more complex, if there are two or more input polygons and those could overlap each other. 
Userlevel 4
+36
- Evangelist
- 637 replies
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24 January 2022
A completely different approach:
PointOnAreaOverlayer (generate list on output 'Area'): Attach the attributes of the points to the polygon as a list.
ListHistogrammer: Fill a new list with the number of occurences of each value in the list. The most common value will get index 0.
ListIndexer: Add the attributes with index 0 of the new list to the polygon.
Awesome, thank you both for your support!
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