st_force2d

Berlaku untuk: Databricks Runtime 18.1 ke atas

Penting

Fitur ini ada di Pratinjau Umum.

Mengembalikan proyeksi 2D dari nilai Input Geografi atau Geometri .

Nilai SRID dari nilai Geografi atau Geometri output sama dengan nilai input.

Fungsi mengembalikan Tidak Ada jika input tidak ada.

Untuk fungsi Databricks SQL yang sesuai, lihat st_force2d fungsi.

Sintaksis

from pyspark.databricks.sql import functions as dbf

dbf.st_force2d(col=<col>)

Parameter-parameternya

Parameter	Tipe	Deskripsi
col	pyspark.sql.Column atau str	Nilai Geografi atau Geometri.

Catatan

Jika input memiliki koordinat Z dan/atau M, ini dihilangkan dalam output.

Jika input sudah 2D, input dikembalikan apa adanya.

Examples

Hapus koordinat M dari geometri titik.

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('POINT M (1 2 3)',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_force2d(dbf.st_geogfromtext('wkt'))).alias('result')).collect()

[Row(result='SRID=4326;POINT(1 2)')]

Hilangkan koordinat Z dan M dari geografi multi-titik:

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('MULTIPOINT ZM (EMPTY,0 0 10 20, 1 1 11 21)',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_force2d(dbf.st_geogfromtext('wkt'))).alias('result')).collect()

[Row(result='SRID=4326;MULTIPOINT(EMPTY,(0 0),(1 1))')]

Hilangkan koordinat Z dari geografi poligon:

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('POLYGON Z ((0 0 2,1 0 3,0 1 4,0 0 5))',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_force2d(dbf.st_geogfromtext('wkt'))).alias('result')).collect()

[Row(result='SRID=4326;POLYGON((0 0,1 0,0 1,0 0))')]

Hilangkan koordinat Z dari geometri titik:

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('POINT Z (1 2 3)',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_force2d(dbf.st_geomfromtext('wkt', 4326))).alias('result')).collect()

[Row(result='SRID=4326;POINT(1 2)')]

Hilangkan koordinat Z dan M dari geometri linestring:

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('LINESTRING ZM (0 0 10 20, 1 1 11 21)',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_force2d(dbf.st_geomfromtext('wkt', 4326))).alias('result')).collect()

[Row(result='SRID=4326;LINESTRING(0 0,1 1)')]

Kembalikan geometri 2D input seperti semula:

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('POINT(1 2)',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_force2d(dbf.st_geomfromtext('wkt', 4326))).alias('result')).collect()

[Row(result='SRID=4326;POINT(1 2)')]

Pertahankan SRID dari geografi input tersebut.

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('POINT(1 2)',)], ['wkt'])
df.select(dbf.st_srid(dbf.st_force2d(dbf.st_geogfromtext('wkt'))).alias('result')).collect()

[Row(result=4326)]

Pertahankan SRID dari geometri masukan:

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('POINT(1 2)',)], ['wkt'])
df.select(dbf.st_srid(dbf.st_force2d(dbf.st_geomfromtext('wkt', 4326))).alias('result')).collect()

[Row(result=4326)]

Kembalikan None dengan input :None

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([(None,)], ['wkt'])
df.select(dbf.st_force2d(dbf.st_geogfromtext('wkt')).alias('result')).collect()

[Row(result=None)]