给定密钥的名称，如何从geojson object 中获取值
[英]how to get value from geojson object given the name of the key
问题描述
the below posted geojson is a result of a call to the back-end and i received the data in the data object and by accessing
下面发布的 geojson 是调用后端的结果，我收到了数据 object 中的数据并通过访问
data["geojson"][0]
i got the result posted below.我得到了下面发布的结果。 my question is how to get the values of the following keys in the below posted geojson我的问题是如何在下面发布的 geojson 中获取以下键的值
type
features
i tried the following:我尝试了以下方法：
data["geojson"][0].type
data["geojson"][0]["type"]
data["geojson"][0].features
data["geojson"][0]["features"]
and all of them returned undefined.并且所有这些都返回未定义。 please let me know how to get the valued contained in the type and features keys请让我知道如何获取type和features键中包含的值
geojson :地理JSON ：
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {
"treeID": "35",
"XTOP": "289361.36",
"YTOP": "5627942.71",
"ZTOP": "8.96",
"Zmax": "8.96",
"Zmean": "3.88565217391304",
"Zmin": "-0.22",
"ID": "1"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01294596725522,50.7649619453627], [6.01294655084025,50.7649616904627], [6.01294480728641,50.7649601165684], [6.01290750549077,50.7649556522326], [6.01290401670994,50.7649636585763], [6.01290754960196,50.7649660879154], [6.01292208328504,50.7649672700401], [6.01292595809794,50.764966559787], [6.01294596725522,50.7649619453627] ] ]
}
},
{
"type": "Feature",
"properties": {
"treeID": "36",
"XTOP": "289364.9",
"YTOP": "5627941.39",
"ZTOP": "8.61",
"Zmax": "8.61",
"Zmean": "1.70708487084871",
"Zmin": "-0.23",
"ID": "2"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01303976949995,50.7649411418857], [6.01305108930002,50.7649371142921], [6.01305889189702,50.764932636732], [6.01301768721015,50.7649026156833], [6.01295732492073,50.7649261653276], [6.01294076115474,50.7649457103209], [6.01294266753767,50.7649580827532], [6.01295011530617,50.764959173193], [6.01295547908076,50.764959580542], [6.01298047870417,50.7649545543143], [6.01303976949995,50.7649411418857] ] ]
}
},
{
"type": "Feature",
"properties": {
"treeID": "44",
"XTOP": "289371.82",
"YTOP": "5627938.69",
"ZTOP": "6.68",
"Zmax": "6.68",
"Zmean": "0.923793103448276",
"Zmin": "-0.2",
"ID": "3"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01309078592578,50.7649173526471], [6.01307507511104,50.7649146111696], [6.01306638577937,50.7649151980216], [6.01305830553487,50.7649284838627], [6.01307735761254,50.7649322105161], [6.01309522551646,50.7649278110408], [6.01309078592578,50.7649173526471] ] ]
}
},
{
"type": "Feature",
"properties": {
"treeID": "24",
"XTOP": "289387.04",
"YTOP": "5627931.21",
"ZTOP": "11.13",
"Zmax": "11.13",
"Zmean": "2.8069921875",
"Zmin": "-0.4",
"ID": "4"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01328734454998,50.7648331572413], [6.01328584413784,50.7648322192551], [6.01328139148204,50.7648330946158], [6.01321534224203,50.7648657637964], [6.01320827030382,50.7648877109824], [6.01321376130126,50.764892799138], [6.0132465933806,50.7648895028071], [6.01332086831076,50.7648724264007], [6.01332608767231,50.764868422333], [6.01332753378007,50.7648657608056], [6.01328734454998,50.7648331572413] ] ]
}
},
{
"type": "Feature",
"properties": {
"treeID": "26",
"XTOP": "289385.57",
"YTOP": "5627933.28",
"ZTOP": "9.45",
"Zmax": "9.45",
"Zmean": "2.38978260869565",
"Zmin": "-0.17",
"ID": "5"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01327356674159,50.7648891147094], [6.01328421708838,50.7648866890897], [6.01330010250613,50.7648822387717], [6.01327865741243,50.7648826786135], [6.01325645133365,50.7648861573501], [6.01323567273339,50.7648894927636], [6.01321953843652,50.7648933969757], [6.01321456939895,50.7648956983472], [6.01322071837631,50.7648993641185], [6.01323256304289,50.7648982284572], [6.01327356674159,50.7648891147094] ] ]
}
},
{
"type": "Feature",
"properties": {
"treeID": "27",
"XTOP": "289385.38",
"YTOP": "5627929.41",
"ZTOP": "8.65",
"Zmax": "8.65",
"Zmean": "1.83042253521127",
"Zmin": "-0.16",
"ID": "6"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01328506051132,50.7648178066857], [6.01328365738379,50.7648153419914], [6.0132786226098,50.7648142234655], [6.01327293558325,50.7648144375174], [6.01326339665165,50.7648150026084], [6.01325726764683,50.7648154751905], [6.01324869545512,50.7648275790463], [6.01325507746368,50.7648387168901], [6.01327269485743,50.7648449254249], [6.01328770190544,50.7648498077109], [6.01328895916927,50.7648501097939], [6.01329324733273,50.7648495900291], [6.01329357632041,50.7648488788368], [6.01329338905776,50.7648406883115], [6.01328506051132,50.7648178066857] ] ]
}
},
{
"type": "Feature",
"properties": {
"treeID": "22",
"XTOP": "289387.77",
"YTOP": "5627931.51",
"ZTOP": "11.13",
"Zmax": "11.13",
"Zmean": "5.20431818181818",
"Zmin": "-0.19",
"ID": "7"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01333437641733,50.7648741219068], [6.01333561090581,5
2 个解决方案
解决方案1
0 2021-04-23 09:44:54
I think this will help you.我想这会对你有所帮助。
import json
with open('geojson.json') as f:
data = json.load(f)
for feature in data['features']:
print (feature['geometry']['type'])
print (data['type'])
geojson.json geojson.json
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {
"treeID": "35",
"XTOP": "289361.36",
"YTOP": "5627942.71",
"ZTOP": "8.96",
"Zmax": "8.96",
"Zmean": "3.88565217391304",
"Zmin": "-0.22",
"ID": "1"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
6.01294596725522,
50.7649619453627
],
[
6.01294655084025,
50.7649616904627
],
[
6.01294480728641,
50.7649601165684
],
[
6.01290750549077,
50.7649556522326
],
[
6.01290401670994,
50.7649636585763
],
[
6.01290754960196,
50.7649660879154
],
[
6.01292208328504,
50.7649672700401
],
[
6.01292595809794,
50.764966559787
],
[
6.01294596725522,
50.7649619453627
]
]
]
}
},
{
"type": "Feature",
"properties": {
"treeID": "36",
"XTOP": "289364.9",
"YTOP": "5627941.39",
"ZTOP": "8.61",
"Zmax": "8.61",
"Zmean": "1.70708487084871",
"Zmin": "-0.23",
"ID": "2"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
6.01303976949995,
50.7649411418857
],
[
6.01305108930002,
50.7649371142921
],
[
6.01305889189702,
50.764932636732
],
[
6.01301768721015,
50.7649026156833
],
[
6.01295732492073,
50.7649261653276
],
[
6.01294076115474,
50.7649457103209
],
[
6.01294266753767,
50.7649580827532
],
[
6.01295011530617,
50.764959173193
],
[
6.01295547908076,
50.764959580542
],
[
6.01298047870417,
50.7649545543143
],
[
6.01303976949995,
50.7649411418857
]
]
]
}
},
{
"type": "Feature",
"properties": {
"treeID": "44",
"XTOP": "289371.82",
"YTOP": "5627938.69",
"ZTOP": "6.68",
"Zmax": "6.68",
"Zmean": "0.923793103448276",
"Zmin": "-0.2",
"ID": "3"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
6.01309078592578,
50.7649173526471
],
[
6.01307507511104,
50.7649146111696
],
[
6.01306638577937,
50.7649151980216
],
[
6.01305830553487,
50.7649284838627
],
[
6.01307735761254,
50.7649322105161
],
[
6.01309522551646,
50.7649278110408
],
[
6.01309078592578,
50.7649173526471
]
]
]
}
},
{
"type": "Feature",
"properties": {
"treeID": "24",
"XTOP": "289387.04",
"YTOP": "5627931.21",
"ZTOP": "11.13",
"Zmax": "11.13",
"Zmean": "2.8069921875",
"Zmin": "-0.4",
"ID": "4"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
6.01328734454998,
50.7648331572413
],
[
6.01328584413784,
50.7648322192551
],
[
6.01328139148204,
50.7648330946158
],
[
6.01321534224203,
50.7648657637964
],
[
6.01320827030382,
50.7648877109824
],
[
6.01321376130126,
50.764892799138
],
[
6.0132465933806,
50.7648895028071
],
[
6.01332086831076,
50.7648724264007
],
[
6.01332608767231,
50.764868422333
],
[
6.01332753378007,
50.7648657608056
],
[
6.01328734454998,
50.7648331572413
]
]
]
}
},
{
"type": "Feature",
"properties": {
"treeID": "26",
"XTOP": "289385.57",
"YTOP": "5627933.28",
"ZTOP": "9.45",
"Zmax": "9.45",
"Zmean": "2.38978260869565",
"Zmin": "-0.17",
"ID": "5"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
6.01327356674159,
50.7648891147094
],
[
6.01328421708838,
50.7648866890897
],
[
6.01330010250613,
50.7648822387717
],
[
6.01327865741243,
50.7648826786135
],
[
6.01325645133365,
50.7648861573501
],
[
6.01323567273339,
50.7648894927636
],
[
6.01321953843652,
50.7648933969757
],
[
6.01321456939895,
50.7648956983472
],
[
6.01322071837631,
50.7648993641185
],
[
6.01323256304289,
50.7648982284572
],
[
6.01327356674159,
50.7648891147094
]
]
]
}
},
{
"type": "Feature",
"properties": {
"treeID": "27",
"XTOP": "289385.38",
"YTOP": "5627929.41",
"ZTOP": "8.65",
"Zmax": "8.65",
"Zmean": "1.83042253521127",
"Zmin": "-0.16",
"ID": "6"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
6.01328506051132,
50.7648178066857
],
[
6.01328365738379,
50.7648153419914
],
[
6.0132786226098,
50.7648142234655
],
[
6.01327293558325,
50.7648144375174
],
[
6.01326339665165,
50.7648150026084
],
[
6.01325726764683,
50.7648154751905
],
[
6.01324869545512,
50.7648275790463
],
[
6.01325507746368,
50.7648387168901
],
[
6.01327269485743,
50.7648449254249
],
[
6.01328770190544,
50.7648498077109
],
[
6.01328895916927,
50.7648501097939
],
[
6.01329324733273,
50.7648495900291
],
[
6.01329357632041,
50.7648488788368
],
[
6.01329338905776,
50.7648406883115
],
[
6.01328506051132,
50.7648178066857
]
]
]
}
},
{
"type": "Feature",
"properties": {
"treeID": "22",
"XTOP": "289387.77",
"YTOP": "5627931.51",
"ZTOP": "11.13",
"Zmax": "11.13",
"Zmean": "5.20431818181818",
"Zmin": "-0.19",
"ID": "7"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
6.01333437641733,
50.7648741219068
],
[
6.01333561090581,
5
]
]
]
}
}
]
}
解决方案2
-2 2021-04-23 08:40:51
In object you can access the value by key, And the key is string在 object 中，您可以通过键访问值，键是字符串
now, in your data object, there is no key like "geojson", there are only "type" and "featrues"现在，在您的数据 object 中，没有像“geojson”这样的键，只有“类型”和“特征”
so if I do write, I will data.features.[index].type.所以如果我写，我会 data.features.[index].type。 and This is same with data["featrues"][index]["type"]这与 data["featrues"][index]["type"] 相同
In this case, index is some number like 0, 1, 2..在这种情况下，索引是一些数字，如 0、1、2..
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