将 geojson 多边形导入 RethinkDB 时出错

Question

我关注geojson polygon JSON，我想将其导入 rethinkDB。我尝试使用以下r.geojson 方法导入（参考Building an earthquake map with RethinkDB and GeoJSON）：

r.db("strongloop").table("region").insert(
r.http("91231cd2.ngrok.io/data/geojson/MP14_REGION_WEB_PL_FLAT.json")("features")
.merge(function(zone) {
  return {
    zone: r.geojson(zone("geometry"))
  }
}))

这种方法给了我以下错误：

RqlRuntimeError: Invalid LinearRing.  Are there antipodal or duplicate vertices? Is it self-intersecting? in: r.db("strongloop").table("region").insert(r.http("91231cd2.ngrok.io/data/geojson/MP14_REGION_WEB_PL_FLAT.json")("features").merge(function(var_63) { return {zone: r.geojson(var_63("geometry"))}; }))

我怀疑这是因为 geojson 来自扁平的多面体（使用 geojson.io Meta feature 完成，因为 RethinkDB 不支持多面体） - 但从视觉上看，多边形是我所期望的。我还尝试使用r.polygon 方法如下：

r.db("strongloop").table("region").insert(
r.http("91231cd2.ngrok.io/data/geojson/MP14_REGION_WEB_PL_FLAT.json")("features")
 .merge(function(zone) {
  return {
    zone: r.polygon(zone("geometry")("coordinates"))
  }
}))

但 RethinkDB 希望我给出点数

 RqlCompileError: Expected 3 or more arguments but found 1 in: r.db("strongloop").table("region").insert(r.http("91231cd2.ngrok.io/data/geojson/MP14_REGION_WEB_PL_FLAT.json")("features").merge(function(var_64) { return {zone: r.polygon(var_64("geometry")("coordinates"))}; }))

在使用上面的代码传递给r.polygon 之前，我无法弄清楚如何提取几何坐标数组。

我应该如何解决这个问题？有没有更好的办法？

Answer 1

检查网址

如果您自己执行http 请求会发生什么？我尝试了它并在该资源上获得了 404。我会先运行该命令并确保它有效：

r.http("91231cd2.ngrok.io/data/geojson/MP14_REGION_WEB_PL_FLAT.json")

试试r.args

r.polygon 需要 3 个参数，但您传递的是一个。您可以尝试使用 r.args 在函数中传播这些参数（类似于 Function.apply，如果您是 JavaScript 专家）

r.db("strongloop").table("region").insert(
  r.http("91231cd2.ngrok.io/data/geojson/MP14_REGION_WEB_PL_FLAT.json")  ("features")
   .merge(function(zone) {
    return {
      zone: r.polygon(r.args(zone("geometry")("coordinates")))
    }
  }))

无效的多边形

您的某个多边形似乎无效。如果您使用您发布的其他答案的输入并使用以下功能，它将起作用：

r.expr(ARRAY_FROM_OTHER_ANSWER_WITH_POLYGONS).do(function (arr) {
  // Remove middle element
  return arr.slice(0, 2).add(arr.slice(3, 5))
  // Map all elements to polygons
  // Make sure you pass an array of LON/LATs into `r.polygon`
  .map(function (row) {
    return r.polygon(r.args(row('geometry')('coordinates')(0)));
  });
})

或许你可以一个一个地插入，然后捕获失败的。

以下查询失败：

r.json(r.http('https://gist.githubusercontent.com/tekoadjaib/9e0f0729c050b69b283f/raw/6950765ed4a931b9b208e69a3c39b3114be5c7e3/map.geojson'))('features')
  .map(function (row) {
    return r.polygon(r.args(row('geometry')('coordinates')(0)))
  })

虽然这个（切片前 17 个元素）没有。

r.json(r.http('https://gist.githubusercontent.com/tekoadjaib/9e0f0729c050b69b283f/raw/6950765ed4a931b9b208e69a3c39b3114be5c7e3/map.geojson'))('features')
  .slice(0, 17)
  .map(function (row) {
    return r.polygon(r.args(row('geometry')('coordinates')(0)))
  })

Answer 2

在 RethinkDB Data Explorer 上运行此命令

r.http("6f892736.ngrok.io/data/geojson/MP14_REGION_WEB_PL_FLAT.json") ("features")

我收到了（删除了一些以适应 SO 限制）

 [
{
    "geometry": {
        "coordinates": [
            [
                [
                    103.84874965353661,
                    1.363027350968694
                ],
                [
                    103.84924291873233,
                    1.362752820720889
                ],
                [
                    103.84935645049902,
                    1.362682483934137
                ],
                [
                    103.84973091592526,
                    1.362406260504349
                ],
                [
                    103.84992386166968,
                    1.362263929416379
                ],
                [
                    103.85137091514449,
                    1.361102941278631
                ],
                [
                    103.85194295836556,
                    1.360652909851773
                ],
                [
                    103.8522672818684,
                    1.360326981650605
                ],
                [
                    103.82714577966834,
                    1.241938910658531
                ],
                [
                    103.82714429349235,
                    1.241945678019855
                ]

            ]
        ],
        "type": "Polygon"
    },
    "properties": {
        "FMEL_UPD_D": "2014/12/05",
        "INC_CRC": "F6D4903B6C0B72F8",
        "OBJECTID": 1,
        "REGION_C": "CR",
        "REGION_N": "CENTRAL REGION",
        "SHAPE_Area": 136405631.404,
        "SHAPE_Leng": 131065.464453,
        "X_ADDR": 27836.5573,
        "Y_ADDR": 31929.9186
    },
    "type": "Feature"
},
{
    "geometry": {
        "coordinates": [
            [
                [
                    103.82233409716747,
                    1.247288081083765
                ],
                [
                    103.82235533213682,
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                    103.82236522405806,
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                    103.82239090120945,
                    1.24726873242952
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                    103.82242101348092,
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                ],
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                    103.82244356466394,
                    1.247292075218428
                ],
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                    103.8224842992999,
                    1.247310126516275
                ],

                [
                    103.82229812450149,
                    1.247323592638841
                ],
                [
                    103.82233409716747,
                    1.247288081083765
                ]
            ]
        ],
        "type": "Polygon"
    },
    "properties": {
        "FMEL_UPD_D": "2014/12/05",
        "INC_CRC": "F6D4903B6C0B72F8",
        "OBJECTID": 1,
        "REGION_C": "CR",
        "REGION_N": "CENTRAL REGION",
        "SHAPE_Area": 136405631.404,
        "SHAPE_Leng": 131065.464453,
        "X_ADDR": 27836.5573,
        "Y_ADDR": 31929.9186
    },
    "type": "Feature"
},
{
    "geometry": {
        "coordinates": [
            [
                [
                    103.81270485670082,
                    1.253738883481215
                ],
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                    103.81270819925057,
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                    103.81272550089241,
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                    103.81271663253291,
                    1.253660777180855
                ],
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                    103.81268489667742,
                    1.253637281524639
                ],
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                    103.81271738240808,
                    1.253596580832204
                ],
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                    103.81272993138482,
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                ],
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                    103.81277884770714,
                    1.253527980705921
                ],
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                ],
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                    103.81284783649771,
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                    103.81268859863616,
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                    103.81270485670082,
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                ]
            ]
        ],
        "type": "Polygon"
    },
    "properties": {
        "FMEL_UPD_D": "2014/12/05",
        "INC_CRC": "F6D4903B6C0B72F8",
        "OBJECTID": 1,
        "REGION_C": "CR",
        "REGION_N": "CENTRAL REGION",
        "SHAPE_Area": 136405631.404,
        "SHAPE_Leng": 131065.464453,
        "X_ADDR": 27836.5573,
        "Y_ADDR": 31929.9186
    },
    "type": "Feature"
},
{
    "geometry": {
        "coordinates": [
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        "REGION_N": "CENTRAL REGION",
        "SHAPE_Area": 136405631.404,
        "SHAPE_Leng": 131065.464453,
        "X_ADDR": 27836.5573,
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