# DISTCARTESIAN

The `DISTCARTESIAN` field specifier allows you to find documents that contain fields that define a point (X and Y coordinates) or region that is within a specified distance from a specified point.

You can specify the document position fields either as a pair of fields (corresponding to X and Y coordinate fields), or a single field that uses POINT or POLYGON definitions (in Well-known text format) to specify position information (for example, a unified GeospatialType field).

TIP: If your document location fields contain regions (in Well-known text POLYGON format), the `DISTCARTESIAN` operator calculates distances from the geometric center of the region.

## Format

    FieldText=DISTCARTESIAN{coordX,coordY,dist}:POSITION

`coordX` | The specified x coordinate.
`coordY` | The specified y coordinate.
`dist` | The distance in units from the specified x/y coordinates.
`POSITION` | The document field or fields that contain the position value. You can use one of the following options to specify location fields: a single field. This field must contain a Well-known text format POINT or POLYGON definition (for example, `POINT(x y)`). two fields, in the format `X:Y`, where `X` is the field that contains the x coordinate, and `Y` is the field that contains the y coordinate. You must specify the fields in the order `x:y`. You can specify multiple options for the location fields, in form `POSITION1:POSITION2:POSITION3`, and so on. This form can include a mix of types (unified location fields and split latitude and longitude fields). NOTE: If you use multiple position fields or field pairs, IDOL Content Component cannot match documents where a pair of split geospatial fields occurs interleaved with other geospatial fields. For example, if you use `X1:Y1:POSITION` in your query, and these fields occur in a document in the order `X1`, `POSITION`, `Y1`, IDOL Content Component does not match that document. In such cases, you can rewrite the query, in the form `DISTCARTESIAN{...}:X1:Y1 OR DISTCARTESIAN{...}:POSITION`

NOTE: You can optimize this field specifier by configuring your coordinate fields with the GeospatialType or NumericType property types. If you want to use a single field with POINT or POLYGON definitions, you can optimize the field specifier only by using the unified GeospatialType property.

## Examples

    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). The position of a document in this example is contained in the fields `X` and `Y`.

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

This example matches all documents whose (X,Y) position is within a distance of 5 units of the point (10,11). The position of a document in this example is contained in either the (unified) `POSITION` field, or the separate `X` and `Y` fields.

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