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Opened 10 years ago

Closed 10 years ago

#3671 closed enhancement (fixed)

[PATCH] QuadBuckets for Way storage

Reported by: hansendc Owned by: team
Priority: normal Milestone:
Component: Core Version:
Keywords: Cc:

Description

Well, here's the patch to make QuadBuckets store 2-d objects and not just nodes.

A bounding box is created for each way representing the minimum and maximum Latitude and Longitude that each way touches. If a way's bounding box crosses more than one quadrant at a node in the table then the way is stored in that node. This means that there can now be contents stored in the tree in its branches and not just in leaves. The worst possible case here is that every way in the data set crosses the same two quads and all of them end up getting stored in one huge branch node.

Objects which have no location information, such as nodes that return null for node.getCoor() are stored in the root branch node.

When doing a search, you start at the root node and walk down the tree. But, you must now check each branch on the way down to the leaves to see if any objects in the branch match your search.

Attachments (1)

store-ways-in-quadbuckets.patch (37.2 KB) - added by hansendc 10 years ago.

Download all attachments as: .zip

Change History (2)

Changed 10 years ago by hansendc

comment:1 Changed 10 years ago by stoecker

Resolution: fixed
Status: newclosed

(In [2263]) applied #3671 - patch by Dave Hansen - performance fixes of data storage

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