谷歌地图中两个相似的多边形区域有很大差异？

Question

我的Google地图上有一个多边形工具和一个形状工具。我希望用户能够使用这两种工具计算形状的面积。问题是，对于大小相同（或非常接近）的形状，我得到的区域值大不相同。例如，多边形区域结果将是552523.74，而矩形区域结果将是27.57。

到目前为止，这是我的代码： 的矩形

google.maps.event.addListener(newShape, 'bounds_changed', function() {
var area= rectArea(newShape.getBounds());
}

function rectArea(bounds){
   var sw = bounds.getSouthWest();
   var ne = bounds.getNorthEast();
   var southWest=new google.maps.LatLng(sw.lat(), sw.lng());
   var northEast=new google.maps.LatLng(ne.lat(), ne.lng());
   var southEast = new google.maps.LatLng(sw.lat(),ne.lng());
   var northWest = new google.maps.LatLng(ne.lat(),sw.lng());
   console.log('rec coords: '+ northEast +',' + northWest +',' + southEast +',' + southWest);
        area=google.maps.geometry.spherical.computeArea([northEast,northWest,southEast,southWest]);
        return area;
    }    

多边形

google.maps.event.addListener(drawingManager, 'polygoncomplete', function (polygon) {
        var coordinates = (polygon.getPath().getArray());
        area=google.maps.geometry.spherical.computeArea(coordinates);
        console.log('poly coords: '+ coordinates);
        console.log('Polygon '+ this.id +' Area is: ' + area);
    });

Answer 1

用于计算矩形区域的数组的顺序错误，必须是例如：

[northEast,northWest,southWest,southEast]

示范差异：