[
    {
        "title": "底图图层",
        "id": 1,
        "field": "BaseMap",
        "checked": false,
        "spread": true,
        "disabled":true,
        "children": [
            {
                "title": "天地图影像",
                "checked":true,
                "id": 10,
                "field": "BaseMap"
            },
            {
                "title": "天地图电子",
                "checked":false,
                "id": 12,
                "field": "BaseMap"
            },
            {
                "title": "百度影像",
                "checked":false,
                "id": 14,
                "field": "BaseMap"
            },
            {
                "title": "百度电子",
                "checked":false,
                "id": 15,
                "field": "BaseMap"
            },
            {
                "title": "高德影像",
                "checked":false,
                "id": 16,
                "field": "BaseMap"
            },
            {
                "title": "高德电子",
                "checked":false,
                "id": 17,
                "field": "BaseMap"
            },
            {
                "title": "腾讯影像",
                "checked":false,
                "id": 18,
                "field": "BaseMap"
            },
            {
                "title": "腾讯电子",
                "checked":false,
                "id": 19,
                "field": "BaseMap"
            }
        ]
    },
    {
        "title": "地形图层",
        "id": 2,
        "field": "Terrain",
        "checked": false,
        "spread": true,
        "disabled":true,
        "children": [
            {
                "title": "无地形数据",
                "id": 20,
                "checked": false,
                "field": "Terrain"
            },
            {
                "title": "30米DEM",
                "id": 21,
                "checked": true,
                "field": "Terrain" 
            } 
        ]
    },
    {
        "title":"注记图层",
        "id":3,
        "field": "Plotting",
        "checked": false,
        "spread": true,
        "disabled":true,
        "children": [
            {
                "title": "无注记图层",
                "id": 30,
                "checked": false,
                "field": "Plotting"
            },
            {
                "title": "天地图注记图层",
                "id": 31,
                "checked": true,
                "field": "Plotting"
            }
        ]
    }
    ,{
        "title":"绘制",
        "id":4,
        "field": "Entity",
        "checked": false,
        "spread": true,
        "children": []
    }
]