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# POLYGON

The `POLYGON` field specifier (case sensitive) allows you to find documents whose X/Y position is within a specified polygonal shape.

## Format

    FieldText=POLYGON{coordX,coordY,coordX,coordY,...}:X:Y

`coordX,coordY` | The coordinates for one of the vertices. Specify an X/Y pair of coordinates for each vertex of the polygon working either clockwise or anti-clockwise around the polygon. The polygon can be concave, but the edges cannot cross themselves. You can specify coordinates with decimal numbers.
`X` | The document field containing the X coordinate.
`Y` | The document field containing the Y coordinate.

Two fields must be specified and must be given in the order `X:Y`. You can specify more than one pair of fields in the form `X1:Y1:X2:Y2` and so on.

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

## Example

    FieldText=POLYGON{1,1,-1,1,0,-2,1,-1}:XPOS:YPOS

This example matches all documents whose (X,Y) position is within the quadrilateral with vertices at (1,1), (-1,1), (0,-2), (1,-1).

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