可以打开或关闭此“对齐网格”功能并更改布局网格单元格的大小。
You can turn this "snap to grid" feature on and off and change the size of the layout grid cells.
可以通过编辑该网格单元格中的值对数据库进行修改，而且可以添加或删除行。
You can modify the database by editing values in the cells of the grid, and you can add or delete rows.
第一个参数（1000）以米为单位指定网格单元格大小，因为米是与 location 列相关联的 SRS 的直线单位。
The first parameter (1000) specifies the grid cell size in meters, because that is the linear unit of the SRS associated with the location column.
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