{ "total": 3, "start": 1, "num": 3, "nextStart": -1, "items": [ { "id": "cb12dbc1f09343478b9dc0a4798e3c39", "owner": "geoscene", "created": 1540192906196, "modified": 1540192906196, "guid": null, "name": null, "title": "实时空气质量指数AQI-PM2.5", "type": "Web Map", "typeKeywords": [ "ArcGIS Online", "Explorer Web Map", "Map", "Online Map", "Web Map" ], "description": null, "tags": [ "实时空气质量指数AQI" ], "snippet": "由世界空气质量指数项目团队（http://aqicn.org） 提供的全球主要城市空气质量指数AQI（Air Quality Index）实时数据。空气质量指数AQI（Air Quality Index, AQI）是定量描述空气质量状况的非线性无量纲指数。该AQI实时数据覆盖了来自70多个国家、600多个城市的9000多个站点。其数值越大、级别和类别越高、表征颜色越深，说明空气污染状况越严重。目前，指数信息每15分钟刷新一次（在高流量的情况下最长可达1小时）。该地图指数为基于PM2.5的AQI。", "thumbnail": "thumbnail/thumbnail1541560038546.png", "documentation": null, "extent": [ [ -19.4798, -14.6016 ], [ 180, 67.6105 ] ], "categories": [ ], "spatialReference": null, "accessInformation": null, "classification": null, "licenseInfo": null, "culture": "zh-cn", "properties": null, "advancedSettings": null, "url": null, "proxyFilter": null, "access": "public", "size": 820, "subInfo": 0, "appCategories": [ ], "industries": [ ], "languages": [ ], "largeThumbnail": null, "banner": null, "screenshots": [ ], "listed": false, "numComments": 0, "numRatings": 0, "avgRating": 0, "numViews": 811, "groupCategories": [ ], "scoreCompleteness": 45, "groupDesignations": null, "token1ExpirationDate": -1, "token2ExpirationDate": -1, "lastViewed": -1 }, { "id": "203e6acb340a4dd4ae091b87d68d5e07", "owner": "geoscene", "created": 1564557557610, "modified": 1564557557610, "guid": null, "name": null, "title": "现时天气及风力站数据", "type": "Web Map", "typeKeywords": [ "ArcGIS Online", "Explorer Web Map", "Map", "Online Map", "Web Map" ], "description": "当前天气状况图层由NOAA提供的每小时METAR<\/a>和浮标<\/a>数据创建。<\/font><\/span>

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一个典型的气象机场报告(METAR)，亦称为航空例行天气报告，为每个陆基站的位置提供若干天气变数，包括:<\/span>
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