BigQuery GeoViz - 多边形不显示填充颜色

Question

我有以下 csv 格式的 GEO 数据行：

id,Estate_Type,Price_m2,Region,is_region,geometry
6,Stanovanje,3882.2626335950154,Osrednjeslovenska,True,"POLYGON ((14.630605697631836 46.3638801574707, 14.630454063415584 46.3354377746582, 14.635508537292537 46.324775695800895, 14.640621185302734 46.324783325195426, 14.650788307190055 46.3141250610351, 14.666124343872013 46.31414413452154, 14.666086196899528 46.30702972412121, 14.671197891235408 46.30703735351574, 14.6711044311524 46.28926086425787, 14.665971755981445 46.28569793701183, 14.671066284179688 46.282146453857536, 14.696625709533691 46.28217697143549, 14.691438674926871 46.26794815063482, 14.696492195129508 46.25728607177729, 14.732278823852653 46.25732421875, 14.73739147186285 46.25732803344738, 14.737372398376408 46.2537727355957, 14.747575759887695 46.25022888183588, 14.75270938873291 46.25379180908209, 14.762914657592717 46.250244140625, 14.798718452453727 46.25383758544933, 14.844708442687931 46.25033187866205, 14.84982013702404 46.25033569335943, 14.85489559173584 46.24323272705078, 14.875326156616211 46.23969650268555, 14.87530612945568 46.23614120483404, 14.89062404632574 46.232601165771484, 14.890605926513786 46.22904586791998, 14.895717620849666 46.22905349731451, 14.900830268859863 46.22905731201166, 14.905884742736816 46.218395233154354, 14.90586376190197 46.21483993530285, 14.900754928588924 46.214836120605526, 14.900715827941951 46.207725524902344, 14.895601272583008 46.20771789550781, 14.895583152771053 46.20416259765631, 14.895565032959098 46.2006072998048, 14.895525932312069 46.19349670410162, 14.895486831665096 46.18638610839844, 14.88013076782238 46.18281555175787, 14.880093574523983 46.17570495605469, 14.869870185852164 46.175693511963004, 14.864757537841797 46.175685882568416, 14.859645843505916 46.175682067871094, 14.839177131652775 46.172103881835994, 14.839156150817928 46.16854858398449, 14.818708419799862 46.16852951049805, 14.818690299987907 46.16497421264654, 14.818651199340934 46.15786361694336, 14.823762893676815 46.15786743164074, 14.823726654052734 46.15075683593756, 14.833930015563965 46.14721298217779, 14.828779220581055 46.14009475708008, 14.823670387268066 46.14009094238287, 14.82364940643322 46.136535644531364, 14.823631286621094 46.13298034667969, 14.823610305786246 46.12942123413086, 14.828722000122127 46.12942886352539, 14.828703880310172 46.125873565673885, 14.838949203491268 46.1294403076173, 14.884958267211914 46.12948608398449, 14.884861946106014 46.111709594726676, 14.879750251770076 46.1117057800293, 14.879711151123104 46.104595184326286, 14.884825706481877 46.104598999023494, 14.884765625000057 46.09393310546881, 14.88987922668457 46.093936920166016, 14.894992828369254 46.09394454956055, 14.925664901733398 46.09397506713867, 14.930777549743596 46.0939826965332, 14.946113586425781 46.09399795532232, 14.951283454895133 46.10466766357433, 14.961527824401912 46.10823440551752, 14.961545944213924 46.1117897033692, 14.966657638549805 46.111797332763786, 14.976900100708065 46.115364074707145, 14.987127304077205 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46.33533477783203, 14.543563842773551 46.33890151977545, 14.543622970581055 46.34956741333008, 14.533434867858887 46.35667037963873, 14.533455848693904 46.360225677490234, 14.53347396850586 46.36378097534191, 14.55903530120844 46.36380767822271, 14.569258689880428 46.363819122314396, 14.574332237243652 46.356712341308594, 14.584559440612793 46.356723785400504, 14.584576606750488 46.36027908325201, 14.610136985778922 46.36030578613281, 14.630605697631836 46.3638801574707))"

当尝试在 BigQuery Geo Viz 中对其进行可视化时，我得到一个没有填充的多边形，如下图所示。 FillOpacity 设置为 1，FillColor 设置为 #000000

在 Looker Studio 中使用 Field map 可视化类似的绘图时，它会完全变成蓝色，如下图所示。

问题 1. 两个可视化中均未显示多边形填充是否有特定原因？

• 与此同时，我发现当放大得非常近并将鼠标放在多边形的边界上时，填充颜色会显示。 （此时只有一小部分多边形边界可见。）

问题2. Looker Studio中地图背景消失有什么原因吗？

Answer 1

我认为两者都是由同一问题引起的，即倒多边形（请参阅https://cloud.google.com/bigquery/docs/geospatial-data#polygon_orientation了解解释）。不过我只用 GeoViz 进行了测试。

我已经尝试在 GeoViz 中使用您的多边形数据：

select st_geogfromtext("POLYGON ((...))") as geo

这按预期工作，显示带有填充的多边形。但随后将其视为定向多边形（这就是加载 CSV 文件时发生的情况）：

select st_geogfromtext("POLYGON ((...))", oriented=>true) as geo

- 这显示空多边形。

在加载之前或之后反转多边形，例如这会反转所有巨大的多边形

update table 
set geo = ST_Difference(ST_GeogFromText('fullglobe'), geo)
where ST_Area(geo) > 2e14

处理平面地图的工具还没有做好处理倒置多边形的准备，倒置多边形会填充除小区域之外的所有地图，并且可能会出现问题。