ST_MaxM takes a geometry column and returns a double column. The output column contains the maximum m-value of each input geometry.
If the input geometry does not have m-values the function will return Na.
| Function | Syntax |
|---|---|
| Python | max |
| SQL | ST |
| Scala | max |
For more details, go to the GeoAnalytics Engine API reference for max_m.
Examples
from geoanalytics.sql import functions as ST
line_json = '{"paths": [[[0, 51, 801, 5],[1, 51, 129, 6],[2, 52, 206, 4]]], "hasM":true, "hasZ":true}'
df = spark.createDataFrame([(line_json, )], ["line_json"]) \
.withColumn("geometry", ST.line_from_esri_json("line_json"))
df.select(ST.max_m("geometry").alias("max_m")).show()Result
+-----+
|max_m|
+-----+
| 6.0|
+-----+Version table
| Release | Notes |
|---|---|
1.0.0 | Python and SQL functions introduced |
1.5.0 | Scala function introduced |