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並前往https://books.google.com.tw/books?id=6PY8EAAAQBAJ&pg=PA180&lpg=PA180&dq=postgis+srid&source=bl&ots=eDtoPsTh2p&sig=ACfU3U1wH6NP5Bl4sLamg9r_lBuamDowmQ&hl=zh-TW&sa=X&ved=2ahUKEwimxafwhP71AhWwqpUCHTu9BJUQ6AF6BQivAhAD

PostGIS in Action, Third Edition - 第 180 頁 - Google 圖書結果

In fact, many spatial databases, PostGIS included, store their geometry data in a format ... function is ST_AsText, but this function won't output the SRID.

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