kopia lustrzana https://github.com/magicbug/Cloudlog
128 wiersze
5.1 KiB
JavaScript
128 wiersze
5.1 KiB
JavaScript
![]() |
// HamGridSquare.js
|
||
|
// Copyright 2014 Paul Brewer KI6CQ
|
||
|
// License: MIT License http://opensource.org/licenses/MIT
|
||
|
//
|
||
|
// Javascript routines to convert from lat-lon to Maidenhead Grid Squares
|
||
|
// typically used in Ham Radio Satellite operations and VHF Contests
|
||
|
//
|
||
|
// Inspired in part by K6WRU Walter Underwood's python answer
|
||
|
// http://ham.stackexchange.com/a/244
|
||
|
// to this stack overflow question:
|
||
|
// How Can One Convert From Lat/Long to Grid Square
|
||
|
// http://ham.stackexchange.com/questions/221/how-can-one-convert-from-lat-long-to-grid-square
|
||
|
//
|
||
|
|
||
|
latLonToGridSquare = function(param1,param2){
|
||
|
var lat=-100.0;
|
||
|
var lon=0.0;
|
||
|
var adjLat,adjLon,GLat,GLon,nLat,nLon,gLat,gLon,rLat,rLon;
|
||
|
var U = 'ABCDEFGHIJKLMNOPQRSTUVWX'
|
||
|
var L = U.toLowerCase();
|
||
|
// support Chris Veness 2002-2012 LatLon library and
|
||
|
// other objects with lat/lon properties
|
||
|
// properties could be numbers, or strings
|
||
|
function toNum(x){
|
||
|
if (typeof(x) === 'number') return x;
|
||
|
if (typeof(x) === 'string') return parseFloat(x);
|
||
|
// dont call a function property here because of binding issue
|
||
|
throw "HamGridSquare -- toNum -- can not convert input: "+x;
|
||
|
}
|
||
|
if (typeof(param1)==='object'){
|
||
|
if (param1.length === 2){
|
||
|
lat = toNum(param1[0]);
|
||
|
lon = toNum(param1[1]);
|
||
|
} else if (('lat' in param1) && ('lon' in param1)){
|
||
|
lat = (typeof(param1.lat)==='function')? toNum(param1.lat()): toNum(param1.lat);
|
||
|
lon = (typeof(param1.lon)==='function')? toNum(param1.lon()): toNum(param1.lon);
|
||
|
} else if (('latitude' in param1) && ('longitude' in param1)){
|
||
|
lat = (typeof(param1.latitude)==='function')? toNum(param1.latitude()): toNum(param1.latitude);
|
||
|
lon = (typeof(param1.longitude)==='function')? toNum(param1.longitude()): toNum(param1.longitude);
|
||
|
} else {
|
||
|
throw "HamGridSquare -- can not convert object -- "+param1;
|
||
|
}
|
||
|
} else {
|
||
|
lat = toNum(param1);
|
||
|
lon = toNum(param2);
|
||
|
}
|
||
|
if (isNaN(lat)) throw "lat is NaN";
|
||
|
if (isNaN(lon)) throw "lon is NaN";
|
||
|
if (Math.abs(lat) === 90.0) throw "grid squares invalid at N/S poles";
|
||
|
if (Math.abs(lat) > 90) throw "invalid latitude: "+lat;
|
||
|
if (Math.abs(lon) > 180) throw "invalid longitude: "+lon;
|
||
|
adjLat = lat + 90;
|
||
|
adjLon = lon + 180;
|
||
|
GLat = U[Math.trunc(adjLat/10)];
|
||
|
GLon = U[Math.trunc(adjLon/20)];
|
||
|
nLat = ''+Math.trunc(adjLat % 10);
|
||
|
nLon = ''+Math.trunc((adjLon/2) % 10);
|
||
|
rLat = (adjLat - Math.trunc(adjLat)) * 60;
|
||
|
rLon = (adjLon - 2*Math.trunc(adjLon/2)) *60;
|
||
|
gLat = L[Math.trunc(rLat/2.5)];
|
||
|
gLon = L[Math.trunc(rLon/5)];
|
||
|
return GLon+GLat+nLon+nLat+gLon+gLat;
|
||
|
}
|
||
|
|
||
|
gridSquareToLatLon = function(grid, obj){
|
||
|
var returnLatLonConstructor = (typeof(LatLon)==='function');
|
||
|
var returnObj = (typeof(obj)==='object');
|
||
|
var lat=0.0,lon=0.0,aNum="a".charCodeAt(0),numA="A".charCodeAt(0);
|
||
|
function lat4(g){
|
||
|
return 10*(g.charCodeAt(1)-numA)+parseInt(g.charAt(3))-90;
|
||
|
}
|
||
|
function lon4(g){
|
||
|
return 20*(g.charCodeAt(0)-numA)+2*parseInt(g.charAt(2))-180;
|
||
|
}
|
||
|
if ((grid.length!=4) && (grid.length!=6)) throw "gridSquareToLatLon: grid must be 4 or 6 chars: "+grid;
|
||
|
if (/^[A-X][A-X][0-9][0-9]$/.test(grid)){
|
||
|
lat = lat4(grid)+0.5;
|
||
|
lon = lon4(grid)+1;
|
||
|
} else if (/^[A-X][A-X][0-9][0-9][a-x][a-x]$/.test(grid)){
|
||
|
lat = lat4(grid)+(1.0/60.0)*2.5*(grid.charCodeAt(5)-aNum+0.5);
|
||
|
lon = lon4(grid)+(1.0/60.0)*5*(grid.charCodeAt(4)-aNum+0.5);
|
||
|
} else throw "gridSquareToLatLon: invalid grid: "+grid;
|
||
|
if (returnLatLonConstructor) return new LatLon(lat,lon);
|
||
|
if (returnObj){
|
||
|
obj.lat = lat;
|
||
|
obj.lon = lon;
|
||
|
return obj;
|
||
|
}
|
||
|
return [lat,lon];
|
||
|
};
|
||
|
|
||
|
testGridSquare = function(){
|
||
|
// First four test examples are from "Conversion Between Geodetic and Grid Locator Systems",
|
||
|
// by Edmund T. Tyson N5JTY QST January 1989
|
||
|
// original test data in Python / citations by Walter Underwood K6WRU
|
||
|
// last test and coding into Javascript from Python by Paul Brewer KI6CQ
|
||
|
var testData = [
|
||
|
['Munich', [48.14666,11.60833], 'JN58td'],
|
||
|
['Montevideo', [[-34.91,-56.21166]], 'GF15vc'],
|
||
|
['Washington, DC', [{lat:38.92,lon:-77.065}], 'FM18lw'],
|
||
|
['Wellington', [{latitude:-41.28333,longitude:174.745}], 'RE78ir'],
|
||
|
['Newington, CT (W1AW)', [41.714775,-72.727260], 'FN31pr'],
|
||
|
['Palo Alto (K6WRU)', [[37.413708,-122.1073236]], 'CM87wj'],
|
||
|
['Chattanooga (KI6CQ/4)', [{lat:function(){ return "35.0542"; },
|
||
|
lon: function(){ return "-85.1142"}}], "EM75kb"]
|
||
|
];
|
||
|
var i=0,l=testData.length,result='',result2,result3,thisPassed=0,totalPassed=0;
|
||
|
for(i=0;i<l;++i){
|
||
|
result = latLonToGridSquare.apply({}, testData[i][1]);
|
||
|
result2 = gridSquareToLatLon(result);
|
||
|
result3 = latLonToGridSquare(result2);
|
||
|
thisPassed = (result===testData[i][2]) && (result3===testData[i][2]);
|
||
|
console.log("test "+i+": "+testData[i][0]+" "+JSON.stringify(testData[i][1])+
|
||
|
" result = "+result+" result2 = "+result2+" result3 = "+result3+" expected= "+testData[i][2]+
|
||
|
" passed = "+thisPassed);
|
||
|
totalPassed += thisPassed;
|
||
|
}
|
||
|
console.log(totalPassed+" of "+l+" test passed");
|
||
|
return totalPassed===l;
|
||
|
};
|
||
|
|
||
|
HamGridSquare = {
|
||
|
toLatLon: gridSquareToLatLon,
|
||
|
fromLatLon: latLonToGridSquare,
|
||
|
test: testGridSquare
|
||
|
};
|
||
|
|