Geohashing accuracy

	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P	Q	R	S	T	U	V	W	X	Y	Z
1	using formulae here:
2	http://stackoverflow.com/questions/13448595/geohash-string-length-and-accuracy
3	http://en.wikipedia.org/wiki/Geographic_coordinate_system
4
5
6	latitude, theta (degrees)				0		10		20		30		40		45		50		60		70		80		85
7	length of a degree-of-latitude at theta			lat	110574.247	m	110607.7371	m	110704.2635	m	110852.4255	m	111034.6274	m	111131.779	m	111229.0724	m	111412.3075	m	111562.0525	m	111659.9711	m	111685.4343	m
8	* approx assuming spherical earth			lng*	111319.4908	m	109628.2976	m	104606.104	m	96405.50696	m	85275.67733	m	78714.76682	m	71554.7894	m	55659.7454	m	38073.5082	m	19330.42672	m	9702.132902	m
9
10	Number of digits in hash		Geohash box (degrees)
11	#n	parity(n)	h (degrees)	w (degrees)	h (m)	w (m)	h (m)	w (m)	h (m)	w (m)	h (m)	w (m)	h (m)	w (m)	h (m)	w (m)	h (m)	w (m)	h (m)	w (m)	h (m)	w (m)	h (m)	w (m)	h (m)	w (m)
12	1	1	22.500	45.000	2487920.558	5009377.086	2488674.085	4933273.392	2490845.930	4707274.682	2494179.574	4338247.813	2498279.116	3837405.480	2500465.028	3542164.507	2502654.128	3219965.523	2506776.919	2504688.543	2510146.182	1713307.869	2512349.349	869869.202	2512922.271	436595.981
13	2	0	5.625	11.250	621980.139	1252344.271	622168.521	1233318.348	622711.482	1176818.671	623544.893	1084561.953	624569.779	959351.370	625116.257	885541.127	625663.532	804991.381	626694.230	626172.136	627536.545	428326.967	628087.337	217467.301	628230.568	109148.995
14	3	1	0.703	1.406	77747.517	156543.034	77771.065	154164.793	77838.935	147102.334	77943.112	135570.244	78071.222	119918.921	78139.532	110692.641	78207.941	100623.923	78336.779	78271.517	78442.068	53540.871	78510.917	27183.413	78528.821	13643.624
15	4	0	0.176	0.352	19436.879	39135.758	19442.766	38541.198	19459.734	36775.583	19485.778	33892.561	19517.806	29979.730	19534.883	27673.160	19551.985	25155.981	19584.195	19567.879	19610.517	13385.218	19627.729	6795.853	19632.205	3410.906
16	5	1	0.022	0.044	2429.610	4891.970	2430.346	4817.650	2432.467	4596.948	2435.722	4236.570	2439.726	3747.466	2441.860	3459.145	2443.998	3144.498	2448.024	2445.985	2451.315	1673.152	2453.466	849.482	2454.026	426.363
17	6	0	0.005	0.011	607.402	1222.992	607.586	1204.412	608.117	1149.237	608.931	1059.143	609.931	936.867	610.465	864.786	611.000	786.124	612.006	611.496	612.829	418.288	613.367	212.370	613.506	106.591
18	7	1	0.001	0.001	75.925	152.874	75.948	150.552	76.015	143.655	76.116	132.393	76.241	117.108	76.308	108.098	76.375	98.266	76.501	76.437	76.604	52.286	76.671	26.546	76.688	13.324
19	8	0	0.000	0.000	18.981	38.219	18.987	37.638	19.004	35.914	19.029	33.098	19.060	29.277	19.077	27.025	19.094	24.566	19.125	19.109	19.151	13.072	19.168	6.637	19.172	3.331
20	9	1	0.000	0.000	2.373	4.777	2.373	4.705	2.375	4.489	2.379	4.137	2.383	3.660	2.385	3.378	2.387	3.071	2.391	2.389	2.394	1.634	2.396	0.830	2.397	0.416
21	10	0	0.000	0.000	0.593	1.194	0.593	1.176	0.594	1.122	0.595	1.034	0.596	0.915	0.596	0.845	0.597	0.768	0.598	0.597	0.598	0.408	0.599	0.207	0.599	0.104
22	11	1	0.000	0.000	0.074	0.149	0.074	0.147	0.074	0.140	0.074	0.129	0.074	0.114	0.075	0.106	0.075	0.096	0.075	0.075	0.075	0.051	0.075	0.026	0.075	0.013
23	12	0	0.000	0.000	0.019	0.037	0.019	0.037	0.019	0.035	0.019	0.032	0.019	0.029	0.019	0.026	0.019	0.024	0.019	0.019	0.019	0.013	0.019	0.006	0.019	0.003
24	13	1	0.000	0.000	0.002	0.005	0.002	0.005	0.002	0.004	0.002	0.004	0.002	0.004	0.002	0.003	0.002	0.003	0.002	0.002	0.002	0.002	0.002	0.001	0.002	0.000
25	14	0	0.000	0.000	0.001	0.001	0.001	0.001	0.001	0.001	0.001	0.001	0.001	0.001	0.001	0.001	0.001	0.001	0.001	0.001	0.001	0.000	0.001	0.000	0.001	0.000
26	15	1	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000
27	16	0	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000
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