后缀为_cell_poi 文件中，存储了poi的相关信息，其中包括poi的id，名字，经纬度，类别id，类别名称以及它所在的网格id。
后缀为_land2type(1)的文件，存储了相关网格的信息，包括经纬度、网格类别等等。
后缀为_cell_info的文件存储的是包含了poi的网格信息，即_land2type(1)中包含的网格数量更多。
删去不在网格内poi后，各城市 poi 各大类别数量如下：
其中，纽约的网格类别代码为：
1 Residential
2 Mixed Residential & Commercial Buildings
3 Commercial & Office Buildings
4 Transportation & Utility
5 Open Space & Outdoor Recreation
6 Other
其余四个城市的网格类别代码为：
1 High Density Urban Fabric
2 ML-Density Urban Fabric
3 Industrial,commercial, public, military and private units
4 Open Space& Recreation
5 Transportation
链接：https://pan.baidu.com/s/1wWqNYOKd4Npzixz27uuh3w 提取码：mfgg
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