- Firs of all, I'd like to know if there is a way to visualize local quad-tree data in Data Inspector ? (local MapQuest Tiles)
- Harder now, is it possible to clip the quad-tree data intersecting a polygon (clip or get the intersected tiles) in Workbench
Thanks for your help.
+3
Should be not too hard to execute in fme.
I don't think you need to clip it as the qaud (wich is a grid/tile anyway) has its identification. You could just select the data using a spatialrelator.
Quad tree is suppose to branch out if objects dont fit in prior level quads.
Also after a certain amount of levels, it becomes computational heavy. (why usualy a max level is set)
Oracle site "discourages" quad tree's as R-tree's are more efficient and faster.
(mind you, i hav'nt tried it out).
I was in the process of trying to implement a quad tree, haven't worked on it lately though.
I still wonder what fme uses, point relating on large sets can take a while if you dont tile them.
I have been looking at r-tree's for other projects (it seems to be efficient with large sets) but for my project now, I already have the data quad-tree indexed.
My problem is on how to use a spatialrelator transformer with a quad-tree input. What kind of reader do I have to connect ?
Any idea ?
+3
What is the format of your quad tree, just the relational tree or the actual qads with objects? Or objects with tree relations as attributes?
If you have quad geomtery u can
Clip existing polygons with the quads and relate the polygon data to the objects in the quads?
Then u could AreOnAre overly, Clipp, build Topology to relate or filter objects.
can post/show example maybe?
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