question: public static String geometryToWKB ( Geometry g , CoordinateTransformation transformation ) { StringBuilder wkb = new StringBuilder ( BIG_ENDIAN ) ; if ( g instanceof Point ) { wkb . append ( WKB_POINT ) ; } else if ( g instanceof LineString ) { wkb . append ( WKB_LINE_STRING ) ; } else if ( g instanceof MultiLineString ) { wkb . append ( WKB_MULTI_LINE_STRING ) ; } for ( Coordinate coordinate : g . getCoordinates ( ) ) { Coord c = transformation . transform ( MGC . coordinate2Coord ( coordinate ) ) ; wkb . append ( Long . toHexString ( Double . doubleToRawLongBits ( c . getX ( ) ) ) ) ; wkb . append ( Long . toHexString ( Double . doubleToRawLongBits ( c . getY ( ) ) ) ) ; } return wkb . toString ( ) ; }
target:  Converts the given geometry into a well-known binary string.