このトピックでは、空間参照間の軌道を変換するST_Transform関数について説明します。
構文
trajectory ST_Transform(trajectory traj, int srid);パラメーター
パラメーター | 説明 |
traj | 変換する軌道。 |
srid | 変換先の空間参照内の軌道の空間参照識別子 (SRID) 。 |
説明
軌道がSRIDを有する場合にのみ、軌道を指定された空間基準に変換することができる。
例：
select ST_Transform('{"trajectory":{"version":1,"type":"STPOINT","leafcount":4,"start_time":"2020-11-03 08:00:00","end_time":"2020-11-03 18:03:20","spatial":"SRID=4326;LINESTRING(114.49211 37.97999,114.49211 37.97521,114.49191 37.98021,124 37)","timeline":["2020-11-03 08:00:00","2020-11-03 08:01:40","2020-11-03 08:03:20","2020-11-03 18:03:20"]}}'::trajectory, 2401);
st_transform
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{"trajectory":{"version":1,"type":"STPOINT","leafcount":4,"start_time":"2020-11-03 08:00:00","end_time":"2020-11-03 18:03:20","spatial":"SRID=2401;LINESTRING(29019418.8397 5025539.47515,29019696.5878 5024992.53808,29019387.9428 5025555.44863,29954166.377 5430882.06455)","timeline":["2020-11-03 08:00:00","2020-11-03 08:01:40","2020-11-03 08:03:20","2020-11-03 18:03:20"]}}
(1 row)