传单的坐标反射问题 [英] Coordinate Reflection issue with Leaflet

问题描述

祝大家节日快乐.我在尝试使用L.geoJson()绘制多边形图层时注意到一个有趣的行为怪癖.考虑以下代码:

Salutations all and happy holidays. I Noticed an interesting behavioral quirk while trying to draw polygon layers with L.geoJson(). consider the following code:

var polygonCoords = [
        {"type": "Feature",
        "properties": {"group": "Violations"},
        "geometry": {
            "type" : "Polygon",
            "coordinates": [[
                [-107.69348, 43.22519],
                [-105.48523, 42.99259],
                [-107.7594, 42.26105]
            ]]
       }
    }];

和

var polygons = L.polygon([
        [43.22519, -107.69348],
        [42.99259, -105.48523],
        [42.26105, -107.7594]
    ]);

现在，两者都在各自的上下文中工作.我只是想知道为什么必须反映L.polygon()中的坐标矩阵，以便像这样传递给L.goeJson()时显示人们期望的坐标:

Now, both work in their respective contexts. I was just wondering why the coordinate matrix within L.polygon() has to be reflected in order to show up where one expects it to be when passed into L.goeJson() like so:

var jsonPoly = L.geoJson(polygonCoords, {
        style: function(feature) {
            if (feature.properties.group == "Violations") {
                 return {color: "#ff0000"};
            }
        }
    });

这是传单内的疏忽吗?另外，有没有办法通过 toGeoJson(polygons) 来自动化这种反射?

Or is this an oversight within leaflet? Also, is there a way to automate this reflection with say toGeoJson(polygons)?

非常感谢.

推荐答案

创建geoJson图层时，坐标应符合GeoJSON标准(x，y，z或lng，lat，海拔)(

When creating a geoJson layer the coordinates are expected to match the GeoJSON standard (x,y,z or lng, lat, altitude) (GeoJSON position specs)

如果您的坐标不是这种格式的字符串是GeoJSON，则可以使用自定义的coordsToLatLng函数创建GeoJSON图层，该函数将处理此转换为标准格式(com/reference.html#geojson-coordstolatlng"rel =" nofollow>传单文档)

If you have string of GeoJSON where your coordinates are not in this format, you can create your GeoJSON layer with a custom coordsToLatLng function that will handle this conversion to the standard's format (Leaflet Doc)

如果您有一个多边形图层并将其添加到现有的GeoJSON要素组中，则可以执行以下操作:

If you have a polygon layer and want to add it to an existing GeoJSON feature group you can do something like:

var polygons = L.polygon([
        [43.22519, -107.69348],
        [42.99259, -105.48523],
        [42.26105, -107.7594]
    ]);
var gg = polygons.toGeoJSON();
var jsonFeatureGroup = L.geoJson().addTo(map);
jsonFeatureGroup.addData(gg);
map.fitBounds(jsonFeatureGroup.getBounds());

这篇关于传单的坐标反射问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！