纬度保存为-90与PostGIS RGeo纬度/Lng点

Question

我正在使用地理空间坐标，并在rails控制台测试我的编码

看起来它将我的经度更改为-90.0而不是它应该是-93.291557312011719

任何帮助都将是感激的。用

试过了

"点(#{液化天然气}# {lat})"

和

"点(#{液化天然气。to_f} # {lat.to_f})"

服务器信息

CentOS 6.4
PostgreSQL 9.3
PostGIS 2.1  With Extensions of adminpack, fuzzystrmatch, pg_trgm, plpgsql

IRB控制台

1.9.3-p547 :001 > city = "springfield"                                                                                                                            
 => "springfield" 
1.9.3-p547 :002 > state = "mo"                                                                                                
 => "mo" 
1.9.3-p547 :003 > lng = "37.208969116210938"                                                                                                
 => "37.208969116210938" 
1.9.3-p547 :004 > lat = "-93.291557312011719"                                                                                                
 => "-93.291557312011719" 
1.9.3-p547 :005 > l = Location.new({:city => city, :state => state, :coords => "POINT(#{lng.to_f} #{lat.to_f})", :cs => "#{city}, #{state}"})
2014-07-25 08:31:02 DEBUG --    (18.5ms)  SELECT * FROM geometry_columns WHERE f_table_name='locations'
 => #<Location id: nil, coords: #<RGeo::Geographic::SphericalPointImpl:0x56eb2f2 "POINT (37.20896911621094 -90.0)">, city: "springfield", state: "mo", zip: nil, created_at: nil, updated_at: nil, cs: "springfield, mo", alt: nil> 

但如果我不想保存到DB，我会得到这个

l = "POINT(#{lng.to_f} #{lat.to_f})"                              
 => "POINT(37.20896911621094 -93.291557312011719)" 

这是我的位置表

 create_table "locations", :force => true do |t|
    t.spatial  "coords",     :limit => {:srid=>4326, :type=>"point", :geographic=>true}
    t.string   "city"
    t.string   "state"
    t.string   "zip"
    t.datetime "created_at",                                                             :null => false
    t.datetime "updated_at",                                                             :null => false
    t.string   "cs"
    t.text     "alt"
  end

Answer 1

因为在您的示例代码中，您已将-93.29分配给纬度，而不是经度，它已被四舍五入到-90，这是纬度的可能下限。据推测，RGeo足够智能，可以舍入到最接近的可接受值，而不是抛出错误。