我有一個 json 檔案，其中包含幾個多邊形的坐標。我想要做的是自動獲取坐標，但通過多邊形單獨保存它們。在我目前使用的檔案中，我有 2 個多邊形：
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Here starts second polygon
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]}}
saved as poly1.json
Is there any way to save them separately, I would like the final result to be an like this: array = [coordinates of polygon 1], [coordinates of polygon 2] where in the case of using more polygons than in the example, they will be saved automatically without having to change the code, array = [coordinates of polygon 1], [coordinates of polygon 2],[coordinates of polygon 3] and so on.
So far i have this :
require 'rubygems'
require 'json'
file = File.read('poly1.json')
coordinates = JSON.parse(file)
string=coordinates.to_s[0...-4]
path = string.split"["
path.shift()
path.shift()
path.shift()
This just gets all coordinates from both polygons in path. But what i want is to get polygon 1 coordinates separated from polygon 2 coordinates and in a case where i use a 3 polygon file, to get it separated whit out doing manualy.
Sorry for my bad english, and if you need something else ask in comments.
uj5u.com熱心網友回復：
您的示例很大，因此不容易理解。但是從檔案開頭的關鍵結構
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[ [[[0.03990083369766674,41.65117297365802], ...
看起來coordinates是嵌套在鍵下方的簡單哈希geometry。因此我會嘗試以下方法：
require 'rubygems'
require 'json'
file = File.read('poly1.json')
data = JSON.parse(file)
coordinates = data["geometry"]["coordinates"]
coordinates[0] #=> should now return the first coordonate from the array
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