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# BIASDISTSPHERICAL

The `BIASDISTSPHERICAL` field specifier allows you to boost the score of any document according to its distance from a specified point using spherical coordinates (latitude/longitude).

## Format

    FieldText=BIASDISTSPHERICAL{lat,long,range,maxboost}: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.
`range` | The distance in kilometers from the specified latitude and longitude.
`maxboost` | The maximum percentage to boost the result.
`LATFIELD` | The document field containing the latitude.
`LONGFIELD` | The document field containing the longitude.

You must specify two fields in the order `latitude:longitude`. The fields must be `NumericType`.

## Example

    &fieldtext=BIASDISTSPHERICAL{52.2,0.1,100,7}:LAT:LONG

In this example, all documents within 100 kilometers of the point `(lat,long)=(52.2,0.1)` are given a relevance boost. The maximum boost of `7` percent is given to documents at the given point. The boost decreases linearly down to 0 boost at 100 kilometers.

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