Geohash in mapping applications

Geohash in mapping applications December, 2011 Igor Luzhanov

Points selection task ,[object Object],[object Object],[object Object],www.ciklum.net if (point.lat > bounds.S && point.lat < bounds.N && point.lon > bounds.W && point.lon < bounds.E) { ... }

Common approach www.ciklum.net

Common approach problems www.ciklum.net

Solution - Geohash ,[object Object],[object Object],www.ciklum.net

How it works 1/2 ,[object Object],[object Object],[object Object],www.ciklum.net

How it works 2/2 ,[object Object],[object Object],[object Object],[object Object],[object Object],www.ciklum.net

How you can use it – 1D ,[object Object],[object Object],www.ciklum.net SELECT * FROM myPoints WHERE geohash >= u85 AND geohash <= u8x

How you can use it – 2D ,[object Object],[object Object],[object Object],www.ciklum.net SELECT p FROM PointEntity p JOIN p.slices s WHERE s IN (:boundSlices)

Limitations ,[object Object],[object Object],[object Object],www.ciklum.net

Java implementations ,[object Object],[object Object],[object Object],[object Object],www.ciklum.net

Thank you!  ? www.ciklum.net

Geohash in mapping applications

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Geohash in mapping applications