我已关注geojson polygon JSON，我想将其导入rethinkDB。我尝试使用以下r.geojson方法导入（请参阅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"))}; }))
我怀疑是因为geojson来自扁平的多边形（使用geojson.io Meta feature完成，因为RethinkDB不支持多边形） - 但在视觉上，多边形是我所期望的。我还尝试使用r.polygon方法，如下所示：
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希望我给出点数组
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。
我该如何解决这个问题？还有更好的办法吗？
答案 0 :(得分：1)
检查网址
如果您单独执行http请求会怎样？我尝试了它并在该资源上获得了404。我会首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")
尝试r.args
r.polygon需要3个参数，但是你将它传递给了一个。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人员）
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)));
});
})
也许您可以逐个插入它们并捕获失败的那些。
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（切割前17个元素）不是。
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)))
})
答案 1 :(得分：0)
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（删除了一些符合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,
1.247267117084279
],
[
103.82236522405806,
1.247257351790808
],
[
103.82239090120945,
1.24726873242952
],
[
103.82242101348092,
1.247282079176339
],
[
103.82244356466394,
1.247292075218428
],
[
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
],
[
103.81270819925057,
1.253736038375202
],
[
103.81271747666578,
1.25372269002029
],
[
103.81272796270179,
1.253696608214719
],
[
103.81272550089241,
1.25367617858827
],
[
103.81271663253291,
1.253660777180855
],
[
103.81268489667742,
1.253637281524639
],
[
103.81271738240808,
1.253596580832204
],
[
103.81272993138482,
1.25358085854482
],
[
103.81277884770714,
1.253527980705921
],
[
103.81280844732579,
1.253491732178708
],
[
103.81284783649771,
1.253444824881476
],
[
103.81289710415396,
1.253390129269173
],
[
103.81268859863616,
1.253749463519217
],
[
103.81269418659909,
1.253747966839359
],
[
103.81269933160983,
1.253743587040128
],
[
103.81270485670082,
1.253738883481215
]
]
],
"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": [
[
[
103.81422064298785,
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],
[
103.81420878069888,
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],
[
103.8142083125649,
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],
[
103.81420773751474,
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],
[
103.81419024508641,
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],
[
103.81418525918728,
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],
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103.81417827319876,
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],
[
103.81417483815903,
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],
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103.81417401960785,
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],
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103.8141688845694,
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],
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103.81416372167686,
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],
[
103.81415922015667,
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],
[
103.81415911592985,
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],
[
103.81415883649417,
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],
[
103.81415845013613,
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],
[
103.8141580341274,
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],
[
103.8141581823891,
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],
[
103.81415836569447,
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],
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103.81415859033339,
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],
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103.81415863076748,
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],
[
103.81415862268139,
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],
[
103.81416084480966,
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],
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103.81416187994584,
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],
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],
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103.81418792868888,
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],
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103.81423209597757,
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],
[
103.8142345678362,
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],
[
103.81423924468973,
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],
[
103.8142416716218,
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],
[
103.81424197622378,
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],
[
103.81424641316956,
1.252392758672508
],
[
103.81427168974326,
1.252383056828959
],
[
103.81429695645653,
1.252370091131469
],
[
103.81430622571014,
1.252365335143192
],
[
103.81430795807904,
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],
[
103.81430790237042,
1.252364474199889
],
[
103.8143179156083,
1.252359335670564
],
[
103.81433202075975,
1.252352098139711
],
[
103.81434014977647,
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],
[
103.81435231859189,
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],
[
103.81435985727103,
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],
[
103.81437420681739,
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],
[
103.81439499523958,
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],
[
103.81439606179633,
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],
[
103.81439624419711,
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],
[
103.81440192381508,
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[
103.81441291824507,
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],
[
103.81442976570837,
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[
103.81444317808666,
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103.81445277979405,
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[
103.81447443170696,
1.252284820742596
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[
103.8144961555022,
1.252274461397674
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[
103.81450288101018,
1.252271253663335
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[
103.81450281451966,
1.252271173174363
],
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103.81452463535528,
1.252260878944195
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103.81458959107665,
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103.81461125376586,
1.252222416920872
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103.81464389561143,
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103.81465169486319,
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103.81469601222396,
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103.81472344798394,
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103.81478302601083,
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103.81484031637163,
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103.81490026635718,
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103.81491445851239,
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103.81491771565472,
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103.81491908860134,
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103.81493128425387,
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103.8149446623662,
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103.81496569689162,
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103.81497133065815,
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103.81498839193847,
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[
103.81500279627888,
1.252124305136556
],
[
103.8150235712083,
1.252116328782531
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[
103.81502467283144,
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[
103.8150250430265,
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[
103.81502909456997,
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[
103.81503503665392,
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103.81503408874394,
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[
103.81503511578735,
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[
103.81503518952596,
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103.81502759086356,
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103.81502703827032,
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[
103.81502617751417,
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[
103.81501061513713,
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[
103.81497715415199,
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[
103.81496625504562,
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103.8149622584071,
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[
103.8149536020188,
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[
103.8149359747586,
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103.81491979321531,
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[
103.8149053934479,
1.251947173693286
],
[
103.81487481213755,
1.251932856472991
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[
103.81486042674678,
1.251926121564181
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[
103.8148226958023,
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],
[
103.8148209230086,
1.251917860813026
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[
103.81482003795891,
1.251917765848395
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[
103.8148186775897,
1.251917391431592
],
[
103.81480645223182,
1.251914834704565
],
[
103.81478684994318,
1.251914215075008
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[
103.81478406270905,
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],
[
103.81476586212422,
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[
103.81475217215036,
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[
103.81473641375817,
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[
103.81469760451252,
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103.81464911173373,
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103.81464647993616,
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103.81464604415146,
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103.81461634052772,
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103.81459325275814,
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103.81457931114169,
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103.81457055045844,
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103.81450478872569,
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103.81446223335465,
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103.81441832030102,
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103.8143689396795,
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103.81429144309426,
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103.81421839961543,
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103.81418472441868,
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103.81416549402833,
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],
[
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],
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103.81413071763996,
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],
[
103.81415741467501,
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],
[
103.81415875168324,
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],
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103.81415903202367,
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],
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103.81416270520218,
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],
[
103.81416714302718,
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[
103.81416796517983,
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],
[
103.81420024580622,
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],
[
103.8142128693197,
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],
[
103.8142159252361,
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[
103.81421741504606,
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],
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103.81422008102156,
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],
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103.81422398521352,
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103.8142249584107,
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[
103.81422552184074,
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],
[
103.81422064298785,
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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": [
[
[
103.74130389714394,
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],
[
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103.74129985127891,
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103.74126091912512,
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],
[
103.74130389714394,
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]
]
],
"type": "Polygon"
},
"properties": {
"FMEL_UPD_D": "2014/12/05",
"INC_CRC": "11540153B663CA9B",
"OBJECTID": 5,
"REGION_C": "WR",
"REGION_N": "WEST REGION",
"SHAPE_Area": 257110296.977,
"SHAPE_Leng": 258264.026231,
"X_ADDR": 12896.436,
"Y_ADDR": 33986.5714
},
"type": "Feature"
}
]