Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | /** ****************************************************************************************************
* File: variables.js
* Project: geohash
* @author Nick Soggin <iSkore@users.noreply.github.com> on 19-Feb-2019
*******************************************************************************************************/
'use strict';
const
/**
* BASE32
* @type {string}
*/
BASE32 = '0123456789bcdefghjkmnpqrstuvwxyz',
/**
* BASE32_DICT
* @type {object}
*/
BASE32_DICT = {
0: 0x0, 1: 0x1, 2: 0x2, 3: 0x3, 4: 0x4, 5: 0x5, 6: 0x6, 7: 0x7,
8: 0x8, 9: 0x9, b: 0xA, c: 0xB, d: 0xC, e: 0xD, f: 0xE, g: 0xF,
h: 0x10, j: 0x11, k: 0x12, m: 0x13, n: 0x14, p: 0x15, q: 0x16, r: 0x17,
s: 0x18, t: 0x19, u: 0x1A, v: 0x1B, w: 0x1C, x: 0x1D, y: 0x1E, z: 0x1F
},
/**
* PRECISION_AREA
* @type {object}
*/
PRECISION_AREA = {
1: { width: 5000000, height: 5000000 },
2: { width: 1250000, height: 625000 },
3: { width: 156000, height: 156000 },
4: { width: 39100, height: 19500 },
5: { width: 4890, height: 4890 },
6: { width: 1220, height: 610 },
7: { width: 153, height: 153 },
8: { width: 38.2, height: 19.1 },
9: { width: 4.77, height: 4.77 },
10: { width: 1.19, height: 0.596 },
11: { width: 0.149, height: 0.149 },
12: { width: 0.0372, height: 0.0186 }
},
/**
* NEIGHBOR_CODEX
* @type {object}
*/
NEIGHBOR_CODEX = {
n: [ 'p0r21436x8zb9dcf5h7kjnmqesgutwvy', 'bc01fg45238967deuvhjyznpkmstqrwx' ],
s: [ '14365h7k9dcfesgujnmqp0r2twvyx8zb', '238967debc01fg45kmstqrwxuvhjyznp' ],
e: [ 'bc01fg45238967deuvhjyznpkmstqrwx', 'p0r21436x8zb9dcf5h7kjnmqesgutwvy' ],
w: [ '238967debc01fg45kmstqrwxuvhjyznp', '14365h7k9dcfesgujnmqp0r2twvyx8zb' ]
},
/**
* BORDER_CODEX
* @type {object}
*/
BORDER_CODEX = {
n: [ 'prxz', 'bcfguvyz' ],
s: [ '028b', '0145hjnp' ],
e: [ 'bcfguvyz', 'prxz' ],
w: [ '0145hjnp', '028b' ]
},
/**
* ENCODE_AUTO
* @type {number}
*/
ENCODE_AUTO = -1,
/**
* MIN_LNG
* @description
* Minimum longitude 180º west (-180º) of the prime meridian
* @type {number}
*/
MIN_LNG = -180,
/**
* MIN_LAT
* @description
* Minimum latitude 90º south (-90º) of the equator
* @type {number}
*/
MIN_LAT = -90,
/**
* MAX_LNG
* @description
* Maximum longitude 180º east of the prime meridian
* @type {number}
*/
MAX_LNG = 180,
/**
* MAX_LAT
* Maximum latitude 90º north of the equator
* @type {number}
*/
MAX_LAT = 90;
/**
* Significant Figure Hash Length
*
* This is a quick and dirty lookup to figure out how long our hash should be in order to guarantee a certain amount
* of trailing significant figures.
* This was calculated by determining the error: 45/2^(n-1) where n is the number of bits for a latitude or longitude.
* Key is number of desired sig figs, value is minimum length of the geohash.
* @type Array
*/
const
SIGFIG_HASH_LENGTH = [ 0, 5, 7, 8, 11, 12, 13, 15, 16, 17, 18 ];
module.exports = {
BASE32,
BASE32_DICT,
PRECISION_AREA,
NEIGHBOR_CODEX,
BORDER_CODEX,
ENCODE_AUTO,
MIN_LNG,
MIN_LAT,
MAX_LNG,
MAX_LAT,
SIGFIG_HASH_LENGTH
};
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