将纬度和经度转换为十进制值

I have GPS information presented in the form:

我有GPS信息呈现在表格中:

36°57'9" N 110°4'21" W

36°57”9“N 110°4 21 W

I can use the javascript functions of Chris Veness to convert degrees, minutes and seconds to numeric degrees, but first need to parse the GPS info into the individual latitude and longitude strings (with NSEW suffixes). I have read related posts on *, but am not a regex expert (nor a programmer) and need some help with the parsing function. What's the best way to parse this string into latitude and longitude for use in the conversion function?

我可以使用Chris Veness的javascript函数将度数、分和秒转换为数值，但首先需要将GPS信息解析为单独的纬度和经度字符串(带有NSEW后缀)。我读过有关*的相关文章，但我不是regex专家(也不是程序员)，需要一些解析函数的帮助。将这个字符串解析为纬度和经度以便在转换函数中使用的最佳方法是什么?

The result of all this will be a Web link that one can click on to see a Google map representation of location.

所有这些的结果将是一个Web链接，人们可以点击它来查看谷歌地图的位置表示。

7 个解决方案

#1

To parse your input use the following.

要解析输入，请使用以下方法。

function ParseDMS(input) {
    var parts = input.split(/[^\d\w]+/);
    var lat = ConvertDMSToDD(parts[0], parts[1], parts[2], parts[3]);
    var lng = ConvertDMSToDD(parts[4], parts[5], parts[6], parts[7]);
}

The following will convert your DMS to DD

下面将把您的DMS转换为DD

function ConvertDMSToDD(degrees, minutes, seconds, direction) {
    var dd = degrees + minutes/60 + seconds/(60*60);

    if (direction == "S" || direction == "W") {
        dd = dd * -1;
    } // Don't do anything for N or E
    return dd;
}

So your input would produce the following:

因此，您的输入将产生以下内容:

36°57'9" N  = 36.9525000
110°4'21" W = -110.0725000

Decimal coordinates can be fed into google maps to get points via GLatLng(lat, lng) (Google Maps API)

可以将十进制坐标输入谷歌地图，通过GLatLng(lat, lng)(谷歌maps API)获取点。

#2

Corrected the above functions and made the output an object.

修正了上述函数，使输出成为对象。

function ParseDMS(input) {
    var parts = input.split(/[^\d\w\.]+/);    
    var lat = ConvertDMSToDD(parts[0], parts[2], parts[3], parts[4]);
    var lng = ConvertDMSToDD(parts[5], parts[7], parts[8], parts[9]);

    return {
        Latitude : lat,
        Longitude: lng,
        Position : lat + ',' + lng
    }
}


function ConvertDMSToDD(degrees, minutes, seconds, direction) {   
    var dd = Number(degrees) + Number(minutes)/60 + Number(seconds)/(60*60);

    if (direction == "S" || direction == "W") {
        dd = dd * -1;
    } // Don't do anything for N or E
    return dd;
}

#3

My tweaked version coerces the string parts into Numbers so that they can actually be added together rather than concatenated. It also handles decimal values which are common for the Seconds component:

我的修改版本将字符串部分转换为数字，这样它们就可以被添加到一起，而不是被强制连接。它也处理小数值，这是常见的秒组件:

function ParseDMS(input) {
    var parts = input.split(/[^\d\w\.]+/);
    var lat = ConvertDMSToDD(parts[0], parts[1], parts[2], parts[3]);
    var lng = ConvertDMSToDD(parts[4], parts[5], parts[6], parts[7]);
}

The following will convert your DMS to DD

下面将把您的DMS转换为DD

function ConvertDMSToDD(degrees, minutes, seconds, direction) {
    var dd = Number(degrees) + Number(minutes)/60 + Number(seconds)/(60*60);

    if (direction == "S" || direction == "W") {
        dd = dd * -1;
    } // Don't do anything for N or E
    return dd;
}

#4

I got some NaN's on this function and needed to do this (don't ask me why)

我在这个函数上有一些NaN，需要做这个(不要问我为什么)

function ConvertDMSToDD(days, minutes, seconds, direction) {
    var dd = days + (minutes/60) + seconds/(60*60);
    dd = parseFloat(dd);
    if (direction == "S" || direction == "W") {
        dd *= -1;
    } // Don't do anything for N or E
    return dd;
}

#5

Joe, the script you've mentioned already did what do you want. With it you can convert lat and long and put it into link to see location in Google map:

乔，你提到的剧本已经完成了你想要的。有了它，你可以将lat和long转换成链接，在谷歌地图中查看位置:

var url = "http://maps.google.com/maps?f=q&source=s_q&q=&vps=3&jsv=166d&sll=" + lat.parseDeg() + "," + longt.parseDeg()

#6

here is my take on this:

以下是我对此的看法:

function parse_gps( input ) {

if( input.indexOf( 'N' ) == -1 && input.indexOf( 'S' ) == -1 &&
    input.indexOf( 'W' ) == -1 && input.indexOf( 'E' ) == -1 ) {
    return input.split(',');
}

var parts = input.split(/[°'"]+/).join(' ').split(/[^\w\S]+/);

var directions = [];
var coords = [];
var dd = 0;
var pow = 0;

for( i in parts ) {

    // we end on a direction
    if( isNaN( parts[i] ) ) {

        var _float = parseFloat( parts[i] );

        var direction = parts[i];

        if( !isNaN(_float ) ) {
            dd += ( _float / Math.pow( 60, pow++ ) );
            direction = parts[i].replace( _float, '' );
        }

        direction = direction[0];

        if( direction == 'S' || direction == 'W' )
            dd *= -1;

        directions[ directions.length ] = direction;

        coords[ coords.length ] = dd;
        dd = pow = 0;

    } else {

        dd += ( parseFloat(parts[i]) / Math.pow( 60, pow++ ) );

    }

}

if( directions[0] == 'W' || directions[0] == 'E' ) {
    var tmp = coords[0];
    coords[0] = coords[1];
    coords[1] = tmp;
}

return coords;

}

}

This function doesn't handle all types of lat / long types, but it handles the following formats:

此函数不处理所有类型的lat / long类型，但它处理以下格式:

-31,2222,21.99999
-31 13 13 13.75S, -31 13 13 13.75W
-31 13 13 13.75S -31 13 13 13.75W
-31 13 13 13.75W -31 13.75S
36°57'9" N 110°4'21" W
110°4'21" W 36°57'9"N

Which is what i needed.

这正是我所需要的。

#7

I used \d+(\,\d+) and \d+(.\d+) because can have float numbers

我用了\d+(\ d+) \d+(\ d+)因为可以有浮点数

My final function:

我最后的功能:

 convertDMSToDD: function (dms) {
     let parts = dms.split(/[^\d+(\,\d+)\d+(\.\d+)?\w]+/);
     let degrees = parseFloat(parts[0]);
     let minutes = parseFloat(parts[1]);
     let seconds = parseFloat(parts[2].replace(',','.'));
     let direction = parts[3];

     console.log('degrees: '+degrees)
     console.log('minutes: '+minutes)
     console.log('seconds: '+seconds)
     console.log('direction: '+direction)

     let dd = degrees + minutes / 60 + seconds / (60 * 60);

     if (direction == 'S' || direction == 'W') {
       dd = dd * -1;
     } // Don't do anything for N or E
     return dd;
   }