how to convert between degrees, minutes, seconds to Decimal coordinates

Question

Looking for a java utility. It is even better if you can tell me how to do it using geotools library.

Answer 1

It depends on your source format. If it's already split up into degrees (d), minutes (m), and seconds (s), your algorithm is:

(assuming d is can be positive or negative)

dd = Math.signum(d) * (Math.abs(d) + (m / 60.0) + (s / 3600.0));

If it's smooshed together into a string, the usual format is:

"ffffd.mmss"

So parse out using a regular expression or String.substring() to get m and s.

Converting back is:

d = (int)dd;  // Truncate the decimals
t1 = (dd - d) * 60;
m = (int)t1;
s = (t1 - m) * 60;