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# Fields that are within a Specified Distance from a Specified Point

## DISTCARTESIAN

The `DISTCARTESIAN` field specifier allows you to find documents whose X/Y position is within a specified distance from a specified point.

    FieldText=DISTCARTESIAN{coordX,coordY,dist}:X:Y

where:

`coordX` | is the specified X coordinate.
`coordY` | is the specified Y coordinate.
`dist` | is the distance in kilometers from the specified coordinates.
`X` | is the document field that contains the X coordinate.
`Y` | is the document field that contains the Y coordinate.

Note: You must specify two fields in the order `X:Y`.

Example:

    FieldText=DISTCARTESIAN{10,11,5}:X:Y

This example matches all documents whose (X,Y) position is within a distance of 5 units of the point (10,11).

## DISTSPHERICAL

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

where:

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

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

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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