我試圖緩衝MULTIPOLYGON這樣PostGIS的st_buffer返回多邊形
MULTIPOLYGON(((18.601741790771 54.355655947711,18.613586425781 54.356856362498,18.616676330566 54.353855259767,18.601913452148 54.353255012915,18.601741790771 54.355655947711),(18.654441833496 54.360357371971,18.656673431396 54.366558427837,18.667144775391 54.3662583983,18.667659759521 54.36025734727,18.654441833496 54.360357371971),(18.71057510376 54.344750573821,18.719329833984 54.344750573821,18.720188140869 54.341748586892,18.707656860352 54.342449070119,18.71057510376 54.344750573821),(18.590068817139 54.344050129814,18.604831695557 54.344150193975,18.603458404541 54.339146687545,18.585090637207 54.340047363647,18.590068817139 54.344050129814)))
它包含4周分離的多邊形。
當我打電話
select st_astext( gis.st_Buffer( gis.ST_GeomFromText( 'MULTIPOLYGON(((18.601741790771 54.355655947711,18.613586425781 54.356856362498,18.616676330566 54.353855259767,18.601913452148 54.353255012915,18.601741790771 54.355655947711),(18.654441833496 54.360357371971,18.656673431396 54.366558427837,18.667144775391 54.3662583983,18.667659759521 54.36025734727,18.654441833496 54.360357371971),(18.71057510376 54.344750573821,18.719329833984 54.344750573821,18.720188140869 54.341748586892,18.707656860352 54.342449070119,18.71057510376 54.344750573821),(18.590068817139 54.344050129814,18.604831695557 54.344150193975,18.603458404541 54.339146687545,18.585090637207 54.340047363647,18.590068817139 54.344050129814)))' ) ,0) ) as buffer
我正在geiitng單個多邊形(從多actualy第一個元素):
POLYGON((18.601741790771 54.355655947711,18.613586425781 54.356856362498,18.616676330566 54.353855259767,18.601913452148 54.353255012915,18.601741790771 54.355655947711))
任何想法,它是如何posibble從中獲取多邊形緩衝多面?
感謝您的回覆。 – user3003708
我的問題是icorrect MULTIPOLYGON定義。我用模式'MULTIPOLYGON(((__ POLY __),(__ POLY__),...,(__POLY __)))'而不是'MULTIPOLYGON(((__ POLY __)),((__ POLY__)),..., ((__POLY __)))' – user3003708