shameless plug: Cloudant Geo (https://cloudant.com/product/cloudant-features/geospatial/ https://cloudant.com/product/cloudant-features/geospatial/) uses a shar

shameless plug: Cloudant Geo (https://cloudant.com/product/cloudant-features/geospatial/ https://cloudant.com/product/cloudant-features/geospatial/) uses a sharded R*-Tree for big geospatial data.