使用jq为GeoJSON的properties添加新键值对的方法求助

你的问题出在原命令直接替换了整个properties对象，而非在原有对象中添加新键值对。正确做法是定位到每个feature的properties字段，将新键值对合并进去。

正确的jq命令 #

jq --arg dd "$d" '.features[].properties |= . + {date_added: $dd}' /tmp/file-$d.geojson

命令说明 #

• .features[].properties: 精准定位到每个feature下的properties对象
• |= . + {date_added: $dd}: 将新的date_added键值对合并到原properties对象中，完整保留所有已有字段

执行后结果 #

执行该命令后，每个feature的properties会保留原有字段并新增date_added键，结果如下：

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "MultiPolygon",
        "coordinates": [
          [
            [
              [
                4.991669,
                52.324436,
                0
              ]
            ]
          ]
        ]
      },
      "properties": {
        "neighbourhood": "Bijlmer-Oost",
        "neighbourhood_group": null,
        "date_added": "2022-01-01"
      }
    },
    {
      "type": "Feature",
      "geometry": {
        "type": "MultiPolygon",
        "coordinates": [
          [
            [
              [
                5.079162,
                52.388654,
                0
              ]
            ]
          ]
        ]
      },
      "properties": {
        "neighbourhood": null,
        "neighbourhood_group": null,
        "date_added": "2022-01-01"
      }
    }
  ]
}

内容的提问来源于stack exchange，提问作者csl