python 从geoJSON对象中删除特定键值对

x8diyxa7  于 2022-12-02  发布在  Python
关注(0)|答案(2)|浏览(166)

以下是我的geoJSON对象的一个子集，它的特性中包含Multipolygons和GeometryCollections的组合。GeometryCollections包含多种类型的几何图形。

json_str = '{"type": "FeatureCollection", 
"features": [
    {"id": "0", 
    "type": "Feature", 
    "properties": {"Date": "2019/07/10", "PID": "P1"}, 
    "geometry": {"type": "GeometryCollection", 
        "geometries": [
            {"type": "MultiPolygon", 
                "coordinates": [[[[138.5765, -35.0101], [138.5764, -35.0113], [138.5776, -35.0119], [138.5757, -35.0123], [138.5744, -35.013], [138.5739, -35.0119], [138.574, -35.0115], [138.5746, -35.0101], [138.5757, -35.0097], [138.5773, -35.0088], [138.5765, -35.0101]]], [[[138.6124, -35.0016], [138.612, -35.0011], [138.613, -35.0006], [138.6134, -35.0008], [138.6143, -35.0011], [138.613, -35.0024], [138.6124, -35.0016]]]]}, 
            {"type": "MultiLineString",
                "coordinates": [[[138.5625, -34.9778], [138.5609, -34.9791]], [[138.6042, -34.9885], [138.6042, -34.9886]]]},
            {"type": "Point",
                "coordinates": [138.6656, -34.8842]}]}},
    {"id": "1",
    "type": "Feature",
    "properties": {"Date": "2019/07/10", "PID": "P2"},
    "geometry": {
        "type": "MultiPolygon", 
            "coordinates": [[[[138.5731, -34.9273], [138.5741, -34.9281], [138.5752, -34.9273], [138.5763, -34.9266], [138.5779, -34.9269], [138.5785, -34.9268], [138.5797, -34.9272], [138.5807, -34.928], [138.5814, -34.9276], [138.5809, -34.9282], [138.5807, -34.9285], [138.5794, -34.9292], [138.5785, -34.9299], [138.5766, -34.93], [138.5783, -34.9302], [138.5785, -34.9303], [138.5793, -34.9312], [138.5796, -34.9318], [138.579, -34.9332], [138.5795, -34.9336], [138.5803, -34.934], [138.5807, -34.9341], [138.5816, -34.9347], [138.5821, -34.9354], [138.5822, -34.9359], [138.5829, -34.9368], [138.5831, -34.937], [138.5836, -34.9372], [138.5843, -34.9379], [138.5843, -34.939], [138.5829, -34.9394], [138.5823, -34.9395], [138.5817, -34.939], [138.5823, -34.9377], [138.5807, -34.9385], [138.5792, -34.939], [138.5785, -34.9396], [138.5771, -34.9408], [138.5769, -34.9421], [138.5769, -34.9426], [138.5768, -34.944], [138.5785, -34.9437], [138.5788, -34.9441], [138.5789, -34.9444], [138.579, 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[138.6156, -34.9156], [138.6143, -34.9151], [138.6144, -34.9138], [138.6146, -34.913], [138.615, -34.912], [138.6148, -34.911], [138.6142, -34.9102], [138.6139, -34.91], [138.6136, -34.9085], [138.6124, -34.9102], [138.6114, -34.9112], [138.6108, -34.912], [138.611, -34.9123], [138.6114, -34.9125], [138.6123, -34.9131], [138.6127, -34.9138], [138.6129, -34.9144], [138.6131, -34.9156], [138.6132, -34.916]]]]}}]}'

我正在尝试迭代所有要素，并从GeometryCollections中删除所有不是Multipolygons或Polygons的几何图形。同时将所有GeometryCollections转换为Multipolygons。
我在Python中尝试了以下方法，但没有成功

import json

geojson_obj = json.loads(json_str)
features = geojson_obj ['features']

for feature in features:
    if feature['geometry']['type'] == 'GeometryCollection':
        for geometry in feature['geometry']['geometries']:
            if geometry['type'] != 'MultiPolygon':
                geometry = None #maybe?
                #print(geometry)
python

2条答案

按热度按时间
u5rb5r59

u5rb5r591#

你可以创建一个新的列表，其中只包含你想要保留的内容，然后将其替换到原始数据结构中。在本例中，这可以通过列表解析来完成，但我写了一个过程化的示例，因为你还想做其他的工作。

import json

geojson_obj = json.loads(json_str)
features = geojson_obj ['features']

for feature in features:
    if feature['geometry']['type'] == 'GeometryCollection':
        keep_geometries = []
        for geometry in feature['geometry']['geometries']:
            if geometry['type'] == 'MultiPolygon':
                keep_geometries.append(geometry)
        feature['geometry']['geometries'] = keep_geometries
赞(0）分享  回复(0）举报  2022-12-02
ntjbwcob

ntjbwcob2#

通常，组合一个只包含所需项目的 * 新 * 列表比从旧列表中逐个删除不需要的项目更容易。
然后，如果愿意，可以用新列表替换旧列表。
举个简单的例子：

numbers = [0,1,2,3,4,5,6,7,8,9]

# replace numbers with a version of itself that only contains
# numbers that are odd (i.e. n%2 is nonzero)
numbers = [n for n in numbers if n%2]

# numbers is now [1,3,5,7,9]

将此概念应用于代码时，代码看起来如下所示：

for feature in mydict["features"]:
    if feature["geometry"]["type"] == "GeometryCollection":
        feature["geometry"]["geometries"] = [geom for geom in feature["geometry"]["geometries"] if geom["type"] == "Polygon" or geom["type"] == "Multipolygon"]
赞(0）分享  回复(0）举报  2022-12-02
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