Spatial Index
Optimised data structure for spatial search
Overview
Joule provides implementation of a spatial Index based on the Quad Tree data structure and algorithm. The search area is divided in to rectangle and thus the world is flattened from a sphere in to a rectangle spatial index.
This feature is provided as a service which can be embedded within custom processors and has its own DSL.
Example & DSL attributes
The below example creates a search tree of the world as flattened rectangle.
Attributes schema
Attribute | Description | Data Type | Required |
---|---|---|---|
top left coordinates | North west coordinate to create the spatial index | Float Default: [-180f, -90f] | |
width | Width of the search area in terms of degrees | Integer Default: 360 | |
area | Search area | Integer Default: 64800 | |
max levels | Maximun number of sub spatial indexes. Range must be within 0 to 24. | Integer Default: 16 | |
preferred max elements | Maximun number of elements within a bounded area. | Integer Default: 500 |
API Example
This example demonstrates how to query initialise the spatial index and query it thereafter within a custom processor.
For further information how to use this service please contact fractalworks
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