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# DISTSPHERICAL

The `DISTSPHERICAL` field specifier allows you to find documents in which the values of the `LATFIELD` and `LONGFIELD` fields (latitude and longitude, respectively) are within a specified distance from a specified point.

## Format

    FieldText=DISTSPHERICAL{lat,long,dist}:LATFIELD:LONGFIELD

`lat` | The specified latitude. Specify latitude positions south of the equator as negative.
`long` | The specified longitude. Specify longitude positions west of the Greenwich Meridian as negative.
`dist` | The distance in kilometers from the specified latitude and longitude.
`LATFIELD` | The document field containing the latitude.
`LONGFIELD` | The document field containing the longitude.

You must specify two fields, in the order `latitude:longitude`.

Note: You can optimize the field specifier speed by restricting the latitude and longitude fields to the NumericType property type.

## Example

    FieldText=DISTSPHERICAL{37.75,-122.4,20}:LAT:LONG

This example matches all documents whose position is within a 20 kilometer radius of San Francisco (37.75N,122.4W). The latitude and longitude position of a document in this example is contained in the fields `LAT` and `LONG`, respectively.

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