2

如何使用适用于 Rails 的 PostGIS 适配器保存多边形?在我的模型中,我有:

self.rgeo_factory_generator = RGeo::Geos.factory_generator
set_rgeo_factory_for_column(:bounds, RGeo::Geographic.spherical_factory(:srid => 4326))

但是当我尝试将多边形保存到数据库时,它不会引发任何错误,但总是无法存储多边形:

1.9.3p194 :011 > n.bounds = "POLYGON(-149.737965876574 61.1952881991104, -149.71848377896 61.1953198415937, -149.718483761252 61.1952938698801, -149.718483872402 61.1951924591105)"
 => "POLYGON(-149.737965876574 61.1952881991104, -149.71848377896 61.1953198415937, -149.718483761252 61.1952938698801, -149.718483872402 61.1951924591105)" 
1.9.3p194 :012 > n.save
   (0.2ms)  BEGIN
   (0.3ms)  COMMIT
 => true 
1.9.3p194 :013 > n.bounds
 => nil 

我怎样才能让它工作?

4

2 回答 2

6

它是无效的WKT,无法解析,原因有两个:

  1. 没有戒指。您需要在坐标数组周围添加另一组括号。
  2. 环没有闭合。重复起点作为终点。

有效的 WKT 应该是这样的:

POLYGON((-149.737965876574 61.1952881991104, -149.71848377896 61.1953198415937, -149.718483761252 61.1952938698801, -149.718483872402 61.1951924591105, -149.737965876574 61.1952881991104))
于 2012-12-10T19:49:09.313 回答
2

在纯 PostGIS 中,这个多边形会产生geometry contains non-closed rings错误。尝试“关闭”多边形(在末尾添加第一个点)

于 2012-12-09T18:27:04.907 回答