java - GeoTools解析GeoJson时没有这样的属性错误

Question

根据 GeoJson 规范 ( https://www.rfc-editor.org/rfc/rfc7946 )，允许使用具有不同属性集的功能，但是当我使用 FeatureJSON.readFeatureCollection 处理我的 GeoJson 文件时，我收到一条错误消息，指出 no such attribute:tract_boundary。

这是我的文件的一部分，显示了具有不同属性的两个要素(请注意属性名称“tract_boundary”出现在第二个要素属性中):

{
      "type": "Feature",
      "properties": {
        "clu_identifier": "3ecc54fc-5077-11d6-8e82-00065b4a19c0",
        "clu_alt_id": "{5626C60F-23B1-4172-BCFA-842EBDEE776F}",
        "data_source": "danna.steffens",
        "clu_status": null,
        "tract_number": "768",
        "last_change_date": 1352656579000,
        "last_chg_user_nm": null,
        "creation_date": 1113921633000,
        "admin_state": "20",
        "clu_calculated_acreage": 152.41,
        "OBJECTID": 582,
        "cropland_indicator_3CM": 1,
        "edit_reason": null,
        "GlobalId": "{DE7A11AA-BFB6-4DFE-A1D7-D795D7DD7990}",
        "SHAPE_STArea__": 1012852.6422872,
        "state_code": "20",
        "cdist_fips": "2001",
        "highly_erodible_land_type_code": "NHEL",
        "admin_county": "171",
        "clu_classification_code": "2",
        "sap_crp": null,
        "farm_number": "4384",
        "SHAPE_STLength__": 4161.19756459,
        "ESRI_OID": 530,
        "clu_number": "1",
        "data_source_site_identifier": null,
        "comments": " ",
        "county_code": "171"
      },
      "geometry": {...
},
{
      "type": "Feature",
      "properties": {
        "farm_number": "4384",
        "admin_state": "20",
        "tract_number": "5468",
        "admin_county": "171",
        "tract_boundary": true
      },
      "geometry": {...
}

有什么想法吗？

Answer 1

您可以通过调用 org.geotools.geojson.feature.FeatureJSON.readFeatureCollectionSchema(Object, boolean) 获取“完整”模式将第二个参数设置为 false，以便读取整个集合而不是仅读取第一项。然后您就可以正确设置特征的FeatureType。