更改 geoJson 文件中的开始、结束 lineString 坐标顺序

Question

我有一个包含许多 lineString 的 .geojson 文件，其中包含用于监测海岸线变化的横断面的位置，因此每个横断面都跨越 land/water 边界。按原样可视化时，横断面起源于海上，结束于岸上。对于我正在使用的分析工具，我需要交换位置：第一个坐标需要从陆地开始并在海上结束。我将有成千上万个这样的横断面需要改变，我想确保我做的是正确的，但似乎无法弄清楚这个非常简单的任务（抱歉，我是新来的）。我在 python 和地球引擎工作。

# original
{
"type": "FeatureCollection",
"name": "EastChukci_small_testArea",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:EPSG::3857" } },
"features": [
{ "type": "Feature", "properties": { "name": 2722 }, "geometry": { "type": "LineString", "coordinates": [ [ -17592698.71288351342082, 11344741.029055444523692 ], [ -17592054.347651835530996, 11343198.733621645718813 ] ] } },
{ "type": "Feature", "properties": { "name": 2723 }, "geometry": { "type": "LineString", "coordinates": [ [ -17592838.831736516207457, 11344682.393273767083883 ], [ -17592194.440066188573837, 11343140.124529516324401 ] ] } },
{ "type": "Feature", "properties": { "name": 2724 }, "geometry": { "type": "LineString", "coordinates": [ [ -17592978.948162343353033, 11344623.755085829645395 ], [ -17592334.530055023729801, 11343081.513031836599112 ] ] } },
]
}

# desired
{
"type": "FeatureCollection",
"name": "EastChukci_small_testArea",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:EPSG::3857" } },
"features": [
{ "type": "Feature", "properties": { "name": 2722 }, "geometry": { "type": "LineString", "coordinates": [[ -17592054.347651835530996, 11343198.733621645718813 ],  [ -17592698.71288351342082, 11344741.029055444523692 ] ] } },
{ "type": "Feature", "properties": { "name": 2723 }, "geometry": { "type": "LineString", "coordinates": [ [ -17592194.440066188573837, 11343140.124529516324401 ], [ -17592838.831736516207457, 11344682.393273767083883 ] ] } },
{ "type": "Feature", "properties": { "name": 2724 }, "geometry": { "type": "LineString", "coordinates": [ [ -17592334.530055023729801, 11343081.513031836599112 ] ], [ -17592978.948162343353033, 11344623.755085829645395 ] ] } },
]
}

提前致谢。

Answer 1

要读取和写入 json 文件，您可以使用 json 模块。下面的代码应该可以解决您的问题，但缺点是它会立即将整个文件加载到内存中。

import json

with open('data.json', 'r') as json_file:
    data = json.load(json_file)

for feature_data in data['features']:
    feature_data['geometry']['coordinates'].reverse()

with open('data.json', 'w') as json_file:
    json.dump(data, json_file)

更改 geoJson 文件中的开始、结束 lineString 坐标顺序

Change start, end lineString coordinate order in geoJson file

python

geojson