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.
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.
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。
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