deficit zone use green square building block neighborhood

Low with deficit zone of use greenery and squares both at building block level (smaller than 0.5 ha) (150m and 2 min walk) and at neighborhood level (larger than 0.5ha) (400m and 5 min walk). The deficit zone is the residential area that represents the inverse of the given range zone. By building block and neighbourhood greenery and squares we mean: - publicly accessible green for use: parks, pocket parks, hanging greenery, fort greenery, dog walking area, city forest, play forest, cemetery, green playgrounds, publicly accessible building greenery - publicly accessible paved areas: squares, green squares, small street corner squares, sports grounds (NOT: roads, footpaths and cycle paths) - building block (less than 0,5 ha or 5.000m2): For example, greenery around St. Paul's Church, Throne Place, Conscience Square - neighborhood (greater than 0.5 ha or 5,000m2): e.g. Harmoniepark, Dageraadplaats, Grote Markt, Theaterplein This data layer is updated annually in January, provided that the facility is managed and updated annually by the relevant sector/service. The facility has a certain range based on walking distance, taking into account important barriers (water, ring, highway, rail,...) and safe crossings for vulnerable road users (tunnels, bridges, pedestrian crossings with traffic lights). A neighborhood and neighborhood facility gets a walking distance of respectively 400 meters and 800 meters (respectively 5 and 10 min walk). Facilities that function on district (district or postcode) have a range of 1600 meters (20 min walking or 8 min cycling). In combination with the deficit zone, this layer gives an idea of the spatial distribution of this facility. This allows the policy to plan a balanced spatial distribution of the facility based on walking distance.

在街区组团（building block）尺度（小于0.5公顷，步行可达范围150米、耗时2分钟）与邻里单元（neighborhood）尺度（大于0.5公顷，步行可达范围400米、耗时5分钟）下，均存在使用型绿地与广场的供给赤字区域。所谓供给赤字区域，指与给定可达范围区域相对的居住用地。

本数据集所定义的街区组团与邻里单元级绿地及广场包括：
- 公共可使用绿地：公园、口袋公园、垂直绿化、堡垒绿地、遛狗专区、城市森林、游乐林地、墓园、户外游乐场地、公共建筑附属绿地
- 公共可使用硬质铺装场地：广场、绿化广场、街角小型广场、运动场地（不含道路、步行道与自行车道）

其中街区组团（小于0.5公顷，即5000平方米）示例：圣保罗教堂周边绿地、王座广场、良知广场；邻里单元（大于0.5公顷，即5000平方米）示例：哈莫尼公园、达格拉广场、大市场、剧院广场。

本数据图层每年1月更新，前提为相关行业主管部门或运维服务机构每年对设施进行管理与更新。

设施的步行可达范围需综合考量水体、环路、高速公路、铁路等重要阻隔物，以及面向弱势道路使用者的安全过街设施（隧道、桥梁、带交通信号灯的人行横道）。邻里单元设施与街区组团设施的步行可达距离分别为400米（5分钟步行）与800米（10分钟步行）。面向行政区（辖区或邮政编码区域）的设施，可达范围为1600米（20分钟步行或8分钟骑行）。

结合供给赤字区域，该图层可清晰呈现该类设施的空间分布特征，辅助政策制定者基于步行可达距离规划均衡的设施空间布局。