R-Trees

Recommendation

Has Potential

Link

http://gis.umb.no/gis/applets/rtree2/jdk1.1/

Delivery Method

Java Applet

License

Unavailable

Language

English

Author

Havard Tveite

Institution

Norwegian University of Life Sciences (UMB)

Project

StandAlone

RelationshipToProject

StandAlone

Works

Yes

Description

Demonstrates R-Trees for storing rectangles. Allows a choice of splitting algorithms. Shows both the collection of rectangles and the corresponding tree structure. Two views of the data collection can be displayed at one time, to allow comparison of two configurations of the R-tree decomposition. There is a "canned" demo in animation form to see a bunch of rectangles entered. After that (or independent of the demo), users can easily add more rectangles to the collection by dragging them in the "interactive" panel. Uses can save a series of rectangle operations to replay.

Evaluation

Is a little hard to use, due to the complex interface. Reasonably flexible presentation, though it is limited to showing only the corresponding tree structure with little explanation of how the tree is being updated. The duel display for comparison is a good idea, though the fact that only one of them is interactive at a time can be confusing to a person trying to figure out the applet with no instructions on its use (since clicking on the wrong panel gives no results). Saving and replaying operations is a good idea, but hard to figure out without adequate instructions.

ActivityLevel

Animation; Canned Data; User Data

GoodFor

Lecture Aid; Self Study

Screenshots

Videos

References

HowToUse

First Visited

2007

Last Visited

2008-07-07

Last Updated

1999

Topic

RectangleReps

Community

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