3 ms·
The fifth decimal of a GPS coordinate resolves down to 1.1 meter. Ten numbers doesn’t sound much more difficult than three words to me.
by thakoppno 3y ago
The fifth decimal of a GPS coordinate resolves down to 1.1 meter.
Ten numbers doesn’t sound much more difficult than three words to me.
- mlyle 3y ago12.34567N 89.01234W is 14 digits, 2 points, and 2 signs or letters. Earth is about 2^49 square meters. If you want precision of ~8 square meters, you're going to need to convey 46 bits of information (or use an optimization that gives less resolution over oceans, etc, but that's only going to be a small win-- a bit or two). 46/3.3 = 14 digits, but the latitude/longitude coding is a little less efficient because it's not uniform. A plus code does it in 11 characters (not including the plus) worth each 4.32 bits =~ 47.5 bits.
- permo-w 3y agoif Earth sqm = 2^49: to address a single metre, we'd need 49 bits. log_10(2^49) = 14.75 so we'd need 15 spoken decimal digits for 1 sqm. for 8m do log_10(2^47)
- mlyle 3y ago> if Earth sqm = 2^49: to address a single metre, we'd need 49 bits. Yes-- that's why I said it was 46 bits for an 8 square meter area (because this is about the size of area you care about for this problem-- W3W is 9 square meters). > for 8m do log_10(2^47) No, because 2^3 = 8, so one does log_10(2^(49-3)) and gets 13.8. 46 / 3.3 =~ 13.9 works because 1/log_10(2) =~ 3.3.
- blacksmith_tb 3y agoI'd say that's not so different from using IP addresses instead of DNS - generally not too popular (and that's for IPv4...)