Question

我有一个大型的geojson文件，其结构如下：

＆＃13;

{
  "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"
}

＆＃13;

我试图删除重复的ID，并保留最新的版本（即Some_ID_01和Some_ID_02被认为是我的目的重复，我想保留Some_ID_02）。这些＆＃34;重复的内容＆＃34;没有任何顺序（虽然如果我可以按照字母顺序在这个过程中对它们进行排序会很好），这些副本也不一定包含相同的坐标值（它们是同一点的较新版本）

到目前为止，我已经阅读了几个删除重复的json条目（特别尝试修改this guide here中的代码），但我不知道足够的JS来根据我的特定需求修改它。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）以查看是否有任何简化。

是否有可能将geojson输入到程序中并获得一个文件作为回报（即使它是一个文本文件），还是更简单地将其输入内联？

Answer 1

我选择使用python，因为我在那种语言中表现得更强。我将在下面发布我的代码以供参考，但您也可以找到我发布的另一篇文章here，其中详细介绍了使用列表从字典中删除密钥时遇到的问题

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

1 个答案: