获得栅格对象或波段的时间。
语法
text ST_DateTime(raster raster_obj);
timestamp ST_DateTime(raster raster_obj,integer band);
参数
参数名称 | 描述 |
---|---|
raster_obj | 需要计算的raster对象。 |
band | 波段序号,取值从0开始。 |
描述
获得栅格对象或波段的时间。如果指定波段,则返回对应波段的时间信息;未指定波段,则返回包含所有波段时间信息的JSON字符串。
示例
SELECT ST_DateTime(raster_obj)
FROM raster_table;
st_datetime
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
{"0":"Mon Dec 31 00:00:00 2018","1":"Mon Dec 31 01:00:00 2018","2":"Mon Dec 31 02:00:00 2018","3":"Mon Dec 31 03:00:00 2018","4":"Mon Dec 31 04:00:00 2018","5":"Mon Dec 31 05:00:00 2018","6":"Mon Dec 31 06:00:00 2018",".
.7":"Mon Dec 31 07:00:00 2018","8":"Mon Dec 31 08:00:00 2018","9":"Mon Dec 31 09:00:00 2018","10":"Mon Dec 31 10:00:00 2018","11":"Mon Dec 31 11:00:00 2018","12":"Mon Dec 31 12:00:00 2018","13":"Mon Dec 31 13:00:00 2018".
.,"14":"Mon Dec 31 14:00:00 2018","15":"Mon Dec 31 15:00:00 2018","16":"Mon Dec 31 16:00:00 2018","17":"Mon Dec 31 17:00:00 2018","18":"Mon Dec 31 18:00:00 2018","19":"Mon Dec 31 19:00:00 2018","20":"Mon Dec 31 20:00:00 .
.2018","21":"Mon Dec 31 21:00:00 2018","22":"Mon Dec 31 22:00:00 2018","23":"Mon Dec 31 23:00:00 2018"}
SELECT ST_DateTime(raster_obj, 0)
FROM raster_table;
datetime
---------------------------
"Mon Dec 31 00:00:00 2018"