-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Stefan de Konink wrote: > At #osm-nl we ar discussing the float -> long thing. I used floats > because it (obviously) allows more precision, but I agree on some points > mentioned before.
Floats only allow more precision as the location being considered tends towards 0,0 latitude and longitude. For the general case, using an integer with the same number of bits of storage will always be more precise, particularly at the extremes. As others have said, 32 bits gives errors of less than 10mm on the equator, with even greater accuracy as you move away from it. This is around 1000 times more accurate than the data in OSM can be reasonably recorded at with standard GPS equipment. Robert (Jamie) Munro -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkkaODoACgkQz+aYVHdncI0Q9QCfb4/QmrtqfJslx6Z7vDNwIj5t Gc0AoLbsyrPyWW+plUCaekkssN5+d69J =jVqP -----END PGP SIGNATURE----- _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
