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C-squares concept: hierarchical text-based identifiers for global grid squares PowerPoint Presentation

C-squares concept: hierarchical text-based identifiers for global grid squares

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C-squares concept: hierarchical text-based identifiers for global grid squares

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C-squares concept: hierarchical text-based identifiers for global grid squares

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C-squares concept: hierarchical text-based identifiers for global grid squares

Example 10x10 deg. square ID: 3414

Example 5x5 deg. square ID: 3414:1

Example 1x1 deg. square ID: 3414:100

Example 0.5x0.5 deg. square ID: 3414:100:1

(etc.)

Identifiers are meaningful, e.g. “3414” indicates the following:

-- global quadrant “3” (SE) – 3414

-- 40+ degrees of latitude (S) – 3414

-- 140+ degrees of longitude (E) – 3414

The spatial footprint of any data item can be represented as a list of the square IDs (c-square codes) that it intersects.

Data extract

Manual (GUI) data encoder

Spatial query interface

Spatial search result

Clickable map - can function as new spatial query interface

C-squares decoder ( -> GML, KML, other)

Point data encoder

Line data encoder

Polygon data encoder

Data items / Base Data with associated spatial extents (points, lines, polygons, multi-points, etc.)

C-squares workflow options

Non c-squares mapper (s) – e.g. Google Earth, WMS, others...

c-squares encoding

spatial indexing

on-the-fly mapping

Desktop GIS

Spatial Index(stored list of c-squares for every data item)

C-squares mapper (decoder built in)

mapping from the spatial index

data request (spatial subset)

data “footprints” export / import

item retrieval request

http://www.marine.csiro.au/csquares/