void
rrToWire(DNSOutput out, Compression c, boolean canonical) {
	out.writeCountedString(longitude);
	out.writeCountedString(latitude);
	out.writeCountedString(altitude);
}
Returns the altitude as a double
@throws NumberFormatException The string does not contain a valid numeric
value.
src/main/java/core/org/xbill/DNS/GPOSRecord.java