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SetGeoAnchor
Prototype: function SetGeoAnchor ( $attrlat, $attrlong, $lat, $long )
Sets anchor point for and geosphere distance (geodistance) calculations, and enable them.
$attrlat and $attrlong must be strings that contain the names
of latitude and longitude attributes, respectively. $lat and $long
are floats that specify anchor point latitude and longitude, in radians.
Once an anchor point is set, you can use magic “@geodist” attribute
name in your filters and/or sorting expressions. Sphinx will compute geosphere distance
between the given anchor point and a point specified by latitude and longitude
attributes from each full-text match, and attach this value to the resulting match.
The latitude and longitude values both in SetGeoAnchor and the index
attribute data are expected to be in radians. The result will be returned in meters,
so geodistance value of 1000.0 means 1 km. 1 mile is approximately 1609.344 meters.
