Topik ini menjelaskan fungsi ST_AddZ, yang menambahkan nilai sumbu-z ke objek geometri.
Sintaksis
geometry ST_AddZ(geometry g1 , float[] zvalues);Parameter
| Parameter | Deskripsi |
| g1 | Objek geometri yang ingin Anda tentukan. |
| zvalues | Sebuah array yang terdiri dari nilai-nilai sumbu-z. |
Deskripsi
- Tidak ada operasi yang dilakukan pada objek geometri yang sudah memiliki nilai sumbu-z.
- Fungsi ini mengonversi geometri 3DM menjadi geometri ZM dengan menambahkan nilai sumbu-z.
- Setiap elemen dalam array nilai sumbu-z sesuai dengan sebuah titik dalam geometri. Jika jumlah elemen dalam array lebih kecil daripada jumlah titik, fungsi akan menambahkan nilai 0 ke array tersebut.
Contoh
--test point & pointm
SELECT ST_AsText(ST_addZ(ST_MakePoint(116.345, 31.257), '{3.129}'::float8[]));
st_astext
--------------------------------
POINT Z (116.345 31.257 3.129)
(1 row)
SELECT ST_AsText(ST_addZ(ST_MakePointM(116.345, 31.257, 0.006), '{3.129}'::float8[]));
st_astext
---------------------------------------
POINT ZM (116.345 31.257 3.129 0.006)
(1 row)
--test Linestring & LinestringM
SELECT ST_AsText(ST_addZ('LINESTRING(110.268550710707 19.912797729366,110.26842843605 19.912673441389,110.268391117929 19.912635081628)'::geometry, '{68.890150670893,69.183771011419,69.281459503807}'::float8[]));
st_astext
------------------------------------------------------------------------------------------------------------------------------------------------------------------
LINESTRING Z (110.268550710707 19.912797729366 68.890150670893,110.26842843605 19.912673441389 69.183771011419,110.268391117929 19.912635081628 69.281459503807)
(1 row)
SELECT ST_AsText(ST_addZ('LINESTRING M(110.268550710707 19.912797729366 0.0002,110.26842843605 19.912673441389 0.0008,110.268391117929 19.912635081628 0.0019)'::geometry, '{68.890150670893,69.183771011419,69.281459503807}'::float8[]));
st_astext
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
LINESTRING ZM (110.268550710707 19.912797729366 68.890150670893 0.0002,110.26842843605 19.912673441389 69.183771011419 0.0008,110.268391117929 19.912635081628 69.281459503807 0.0019)
(1 row)
--test polygon & polygonM
SELECT ST_AsText(ST_addZ('POLYGON((110.271437131412 19.916296059835,110.271458864211 19.916327373408,110.271472618849 19.916347078401,110.271494504499 19.916378842523,110.271525107774 19.916422797481,110.271559942483 19.916473012678,110.271588184066 19.916514021908,110.271608951741 19.916544548085,110.271637533517 19.916586350525,110.271662184676 19.916622302994,110.27168697878 19.916658943238,110.271690317318 19.916663834658,110.271437131412 19.916296059835))'::geometry, '{66.754327018745,66.76812185145,66.775424819085,66.788278159307,66.806879613697,66.82753102727,66.844599057935,66.857178772322,66.86311322099,66.869851471601,66.876122904615,66.8772665672,66.754327018745}'::float8[]));
st_astext
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
POLYGON Z ((110.271437131412 19.916296059835 66.754327018745,110.271458864211 19.916327373408 66.76812185145,110.271472618849 19.916347078401 66.775424819085,110.271494504499 19.916378842523 66.788278159307,110.271525107774 19.916422797481 66.806879613697,110.271559942483 19.916473012678 66.82753102727,110.271588184066 19.916514021908 66.844599057935,110.271608951741 19.916544548085 66.857178772322,110.271637533517 19.916586350525 66.86311322099,110.271662184676 19.916622302994 66.869851471601,110.27168697878 19.916658943238 66.876122904615,110.271690317318 19.916663834658 66.8772665672,110.271437131412 19.916296059835 66.754327018745))
(1 row)
SELECT ST_AsText(ST_addZ('POLYGON M((110.271437131412 19.916296059835 0.001,110.271458864211 19.916327373408 0.001,110.271472618849 19.916347078401 0.001,110.271494504499 19.916378842523 0.001,110.271525107774 19.916422797481 0.001,110.271559942483 19.916473012678 0.001,110.271588184066 19.916514021908 0.001,110.271608951741 19.916544548085 0.001,110.271637533517 19.916586350525 0.001,110.271662184676 19.916622302994 0.001,110.27168697878 19.916658943238 0.001,110.271690317318 19.916663834658 0.001,110.271437131412 19.916296059835 0.001))'::geometry, '{66.754327018745,66.76812185145,66.775424819085,66.788278159307,66.806879613697,66.82753102727,66.844599057935,66.857178772322,66.86311322099,66.869851471601,66.876122904615,66.8772665672,66.754327018745}'::float8[]));
st_astext
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
POLYGON ZM ((110.271437131412 19.916296059835 66.754327018745 0.001,110.271458864211 19.916327373408 66.76812185145 0.001,110.271472618849 19.916347078401 66.775424819085 0.001,110.271494504499 19.916378842523 66.788278159307 0.001,110.271525107774 19.916422797481 66.806879613697 0.001,110.271559942483 19.916473012678 66.82753102727 0.001,110.271588184066 19.916514021908 66.844599057935 0.001,110.271608951741 19.916544548085 66.857178772322 0.001,110.271637533517 19.916586350525 66.86311322099 0.001,110.271662184676 19.916622302994 66.869851471601 0.001,110.27168697878 19.916658943238 66.876122904615 0.001,110.271690317318 19.916663834658 66.8772665672 0.001,110.271437131412 19.916296059835 66.754327018745 0.001))
(1 row)