OrientDB geolocation -


i´m using orientdb nosql database, , dont know how query in geolocation exactly. i´ve read specific documentation:

orientdb functions

but not understand significance of values.

the distance function:

distance() - computes distance between 2 points in globe using haversine algorithm. coordinates must degrees

example:

where distance(x, y,52.20472, 0.14056) <= 30

two questions:

  1. what x, y, , 30 values?
  2. are values (52.20472, 0.14056) latitude , longitude?

thanks!

distance(x, y,52.20472, 0.14056) <= 30

x , y longitude , latitude (variables) respectively of record/position calculating distance fixed coordinates 52.20472, 0.14056.

consider example:

select distance(longitude, latitude, 52.20472, 0.14056) <= 30 distance places order distance

this query loop through records in places class/cluster , each record injects longitude , latitude of record , calculate it's distance fixed position (52.20472, 0.14056) , return places within 30m.

where

places class/cluster contains records of places longitude longitude field of current record latitude latitude field of current record distance alias field name


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