$within $center radius unit question
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thepumpkin1979
Sep 15, 2010, 4:41:07 PM9/15/10
to mongodb-user
Hi Guys.
I'll appreciate if anyone can tell me what's the unit of "radius"
argument when using $within and $center operator.
I've readed this but I don't see any mention on it:
http://www.mongodb.org/display/DOCS/Geospatial+Indexing
Can anyone tell me how can I convert miles or kilometers to this
radius unit?
Thanks in Advance,
Johan.
I'll appreciate if anyone can tell me what's the unit of "radius"
argument when using $within and $center operator.
I've readed this but I don't see any mention on it:
http://www.mongodb.org/display/DOCS/Geospatial+Indexing
Can anyone tell me how can I convert miles or kilometers to this
radius unit?
Thanks in Advance,
Johan.
roger
Sep 15, 2010, 4:48:04 PM9/15/10
to mongodb-user
They're in degrees - so 1 ~= 69 miles.
We'll be adding this to dthe documentation.
see: http://groups.google.com/group/mongodb-user/browse_thread/thread/beb1c0a5f228c77e
We'll be adding this to dthe documentation.
see: http://groups.google.com/group/mongodb-user/browse_thread/thread/beb1c0a5f228c77e
Andrew Gross
Sep 15, 2010, 5:07:35 PM9/15/10
to mongod...@googlegroups.com
Looks like they are in units of Longitude and Latitude. It says below it that each degree is ~69 miles at the equator, with skew increasing as you get closer to the poles.
Andrew Gross
Support Engineer
QualityHealth
Programs that PerformTM
QualityHealth
Programs that PerformTM
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roger
Sep 15, 2010, 5:16:02 PM9/15/10
to mongodb-user
That is correct. There are some improvements to this underway in a
next version of mongo.
On Sep 15, 2:07 pm, Andrew Gross <agr...@QHperform.com> wrote:
> Looks like they are in units of Longitude and Latitude. It says below it that each degree is ~69 miles at the equator, with skew increasing as you get closer to the poles.
>
> Andrew Gross
> Support Engineer
>
> QualityHealth
> Programs that PerformTM
>
> 848.248.4981 t
> 716.983.1741 c
> agr...@QHperform.com<mailto:ebo...@QHperform.com>www.QHperform.com<http://www.QHperform.com/>
next version of mongo.
On Sep 15, 2:07 pm, Andrew Gross <agr...@QHperform.com> wrote:
> Looks like they are in units of Longitude and Latitude. It says below it that each degree is ~69 miles at the equator, with skew increasing as you get closer to the poles.
>
> Andrew Gross
> Support Engineer
>
> QualityHealth
> Programs that PerformTM
>
> 848.248.4981 t
> 716.983.1741 c
Richard Kreuter
Sep 15, 2010, 5:18:37 PM9/15/10
to mongod...@googlegroups.com
Strictly speaking, there are no units: it's just cartesian geometry.
(The default bounds for coordinates are [-180, 180], which models
degrees of latitude/longitude at the equator, but you can specify custom
bounds, in which case the radius is just a distance in your space.)
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