# ISEA9R DGGS

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### An Axis-Aligned Discrete Global Grid Reference System based on the Icosahedral Snyder Equal Area projection, rotated clockwise 60 degrees, then shearing the x dimension by 1/sqrt(3) times the y advance (30 degrees skew), effectively turning the root diamonds formed by the icosahedron triangular faces joined at their bases into rectangles, then dividing into 3x3 at next zoom levels (aperture 9).

URI: http://www.opengis.net/def/dggrs/OGC/1.0/ISEA9R

CRS: OGC:153456

**ISEA9R DGGS zones**