I would like to compare two lines that intersect AND contain the same attribute value. Out of these lines I would like to return the longest line. Would anyone have any ideas how to do this?
Userlevel 2
+17
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11 June 2015
Hi,
An idea. Assuming that the attribute name is "_group_id", whose value is identical among the lines that should be compared.
(1) Add sequential number attribute (e.g. "_count") to the lines as a temporary ID with a Counter.
(2) Send the lines to both Requestor port and Supplier port of a SpatialRelator.
- Group By: _group_id
- Tests to Perform: <select a predicate that fits to the required "intersect">
- Attribute(s) that Must Differ: _count (exclude self comparison)
(3) Filter the output lines which have intersected in the same group by a Tester.
- Test Clause: 0 < @Value(_related_candidates)
(4) Calculate the length of each Passed line.
(5) Sort the lines by length descending.
(6) Select the longest line for each group by a DuplicateRemover.
- Key Attributes: _group_id
The data flow looks like this.
Takashi
+3
When lines intersect eachother, this might yield more then 1 candidate.
If the attribute wich might have a identical value is not unique, you might want to _relationships{} list for the test and then test for the longest one.
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