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