https://bugzilla.wikimedia.org/show_bug.cgi?id=45661
Web browser: ---
Bug ID: 45661
Summary: Distance query sometimes overreaches the specified
distance
Product: MediaWiki extensions
Version: unspecified
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Unprioritized
Component: SemanticMaps
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected],
[email protected]
Classification: Unclassified
Mobile Platform: ---
Using a distance query like [[Has coordinates::X N, Y E (Z km)]] is, according
to the example page, supposed to query for all items with a coordinate property
set Z km from the point X N, Y E. But as the algorithm used (seemingly, at
least) only defines a "square" of 2Z km * 2Z km centered on X N, Y E, the query
sometimes overreaches beyond a distance of Z. A worst case scenario is when an
item is placed at a corner of this box, where it considers an item of distance
sqrt(2)*Z km from X N, Y E to be a hit. This is an overshoot of over 41%.
I'd suggest, without having studied the code in detail, to add a step in the
algorithm where you do a proper distance calculation on the hits within the
bounding square to filter out the ones that are actually too far away.
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