从 Geojson 数组中删除旧版本

Question

我有一个大的 geojson 文件，其一般结构如下：

{
  "features": [{
      "geometry": {
        "coordinates": [
          [
            [-12.345, 26.006],
            [-78.56, 24.944],
            [-76.44, 24.99],
            [-76.456, 26.567],
            [-78.345, 26.23456]
          ]
        ],

        "type": "Polygon"
      },

      "id": "Some_ID_01",

      "properties": {
        "parameters": "elevation"
      },
      "type": "Feature"
    },

    {
      "geometry": {
        "coordinates": [
          [
            [139.345, 39.2345],
            [139.23456, 37.3465],
            [141.678, 37.7896],
            [141.2345, 39.6543],
            [139.7856, 39.2345]
          ]
        ],
        "type": "Polygon"
      },
      "id": "Some_OtherID_01",
      "properties": {
        "parameters": "elevation"
      },
      "type": "Feature"
    }, {
      "geometry": {
        "coordinates": [
          [
            [143.8796, -30.243],
            [143.456, -32.764],
            [145.3452, -32.76],
            [145.134, -30.87],
            [143.123, -30.765]
          ]
        ],
        "type": "Polygon"
      },
      "id": "Some_ID_02",
      "properties": {
        "parameters": "elevation"
      },
      "type": "Feature"
    }
  ],
  "type": "FeatureCollection"
}

我正在尝试删除重复的 ID，并保留最新版本（即 Some_ID_01 和 Some_ID_02 对我来说被认为是重复的，我想保留 Some_ID_02 ).这些 "duplicates" 的内容没有任何顺序（尽管如果我可以在此过程中对它们进行排序，可能会按字母顺序排列，那就太好了），这些重复项也不一定包含相同的坐标值（它们是较新的版本同一点）

到目前为止，我已经阅读了几个删除重复的 json 条目（尤其是尝试修改 this guide here 中的代码），但我对 JS 的了解不够，无法将其修改为我的特定内容需要。我正在阅读 underscore.js 以查看是否有帮助（基于其他线程中的建议），并且还将查看 python 或 excel（作为 CSV 文件）以查看是否有帮助这些简化。

是否可以在程序中输入 geojson 并在 return 中获取文件（即使它是文本文件），或者将其直接输入会更简单？

Answer 1

我选择了 python 因为我更擅长那种语言。我将 post 下面的代码供参考，但你也可以找到另一个 post 我制作的更详细地说明了我在使用列表从字典中删除键时遇到的问题

import json

json_file = open('features.json')
json_str = json_file.read()
json_data = json.loads(json_str)

dictionaryOfJsonId = {}
removalCounter = 0
keyToRemove = []
valueToRemoveFromList = []
IDList = []

for values in json_data['features']:    #This loop converts the values in the json parse into a dict of only ID
    stringToSplit = values["id"]        #the id values from the json file
    IDList.append(stringToSplit)        #list with all the ID
    newKey = stringToSplit[:-2]         #takes the initial substring up to the last 2 spaces (version)
    newValue = stringToSplit[-2:]       #grabs the last two characters of the string

    if newKey in dictionaryOfJsonId:
        dictionaryOfJsonId[newKey].append(newValue)
    else:
        dictionaryOfJsonId[newKey] = [newValue]


for key in dictionaryOfJsonId:          #Remove entries that do not have duplicates
    if len(dictionaryOfJsonId[key])<2:
        valueToRemoveFromList.append(str(key + dictionaryOfJsonId[key][0]))
    else:
        valueToRemoveFromList.append(str(key +max(dictionaryOfJsonId[key])))


for string in valueToRemoveFromList:    #Remove all values that don't have duplicates from the List of ID
    IDList.remove(string)
    removalCounter+=1


good_features = [i for i in json_data['features'] if i['id'] not in IDList] #Loops through the original and 
                                                                            #removes keys on list from original JSON


with open('features.geojson','w') as outfile:   #create JSON file from list
    json.dump(good_features,outfile)



print "Removed",len(json_data['features'])-removalCounter, "entries from JSON"

从 Geojson 数组中删除旧版本

Remove older versions from a Geojson array

javascript

python

excel

duplicates

geojson