Vega-Lite 中的颠倒 GeoJSON（内嵌数据集）地图

Question

我正在尝试使用 geoshape 标记在 Vega-Lite 中绘制澳大利亚的尖角部分。我的 GeoJSON 文件根据 geojson.io 有效并正确显示： [凯恩斯地区]

但是，Vega-Lite 无法生成类似此图像的任何图像，当通过 mapshaper.org 检查时，CRS 设置为 WGS-84 和 EPGS-4326。

代码描述如下，在 Vega 编辑器中

有什么想法吗？

我尝试过内联为TopoJSON，将CRS字段添加到GeoJSON，然后使用R中的

{sf}

将地图重新投影到另一个CRS，例如3587（正如一些帖子提到的Mapshaper反转轴）。我也尝试过 Vega 而不是 Vega-Lite，但没有成功。

作为一种解决方法，从每个纬度中删除符号 (-) 并选择恒等投影可以提供足够好的视觉效果，但似乎仍然缺少某些内容。

编辑添加：刚刚找到用于投影的

reflectY

属性，这样就无需删除符号了。它仍然感觉像是一种解决方法，所以希望有人能够看到真正的问题。

Answer 1

投影有很多选项可以让您的地图显示正确的方向。我在这里使用了比例和中心，但也有其他方法。

https://vega.github.io/vega/docs/projections/

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "A choropleth map depicting U.S. unemployment rates by county in 2009.",
  "width": 960,
  "height": 500,
  "autosize": "none",
  "data": [
    {
      "name": "counties",
      "values": {
        "type": "FeatureCollection",
        "features": [
          {
            "type": "Feature",
            "geometry": {
              "type": "Polygon",
              "coordinates": [
                [
                  [141.29457654244217, -16.394971044334035],
                  [142.39113112209878, -16.550994658371685],
                  [142.52950790799136, -17.174916330896544],
                  [142.20337079923343, -17.44324930166118],
                  [141.42163626777844, -17.443767652538384],
                  [141.1390526951007, -18.11866049465472],
                  [141.76166249630998, -19.191819594087534],
                  [142.12672343455688, -18.993463991745095],
                  [142.60066821300427, -19.635527944972008],
                  [144.22723846204613, -19.615139477135415],
                  [144.79446325477548, -19.162273594087047],
                  [144.83664502593976, -18.49325539524566],
                  [146.19074846855875, -18.52331974612335],
                  [146.14856669739447, -17.6471339800271],
                  [145.41227187877905, -16.467021816265046],
                  [145.2984153907584, -14.963631488754993],
                  [144.45889526222066, -14.23569407353837],
                  [143.75620868404508, -14.363035605704201],
                  [143.43675892925222, -12.622931710938804],
                  [142.85598795797824, -11.845750962388042],
                  [142.7856850060378, -11.074963207989427],
                  [142.1236369634961, -11.455778319106788],
                  [141.59139217612247, -12.564185278189303],
                  [141.68312895487406, -13.302835278201425],
                  [141.46364656832824, -13.877513617392141],
                  [141.66615336403964, -15.03343607355146],
                  [141.29457654244217, -16.394971044334035]
                ]
              ]
            },
            "properties": {"Area": "Cairns", "Residents": "an_interesting_mob"}
          }
        ]
      },
      "format": {"type": "json", "property": "features"}
    }
  ],
  "projections": [
    {
      "name": "projection",
      "type": "mercator",
      "scale": {"signal": "867"},
      "center": [{"signal": "144"}, {"signal": "-14"}]
    }
  ],
  "marks": [
    {
      "type": "shape",
      "from": {"data": "counties"},
      "encode": {"update": {"fill": {"value": "gray"}}},
      "transform": [{"type": "geoshape", "projection": "projection"}]
    }
  ]
}