Using DataFrames

GeoAnalytics Engine uses Spark DataFrames along with custom geometry data types to represent spatial data. A Spark DataFrame is like a Pandas DataFrame or a table in a relational database, but is optimized for distributed queries.

GeoAnalytics Engine comes with several DataFrame extensions for reading from spatial data sources like shapefiles and feature services, in addition to any data source that PySpark supports. When reading from a shapefile or feature service, a geometry column will be created automatically. For other data sources, a geometry column can be created from text or binary columns using GeoAnalytics Engine functions.

In this tutorial, you will learn how to create a DataFrame from your own definition, as well as from an existing file. You will also learn how to enable time and geometry for a DataFrame, and filter for certain records and columns.

Create a DataFrame

Set up the workspace

1. Import the required modules.

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   # Import the required modules
   from geoanalytics.sql import functions as ST
   from geoanalytics import extensions
   from pyspark.sql.functions import to_timestamp
   

Create a DataFrame from an existing file

1. Specify an existing CSV file to create a DataFrame out of. The CSV contains GPS point readings with information like point ID, latitude and longitude, and a timestamp.

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   # Specify your input dataset location
   myPointCSV = r"c:\MyData\MyGPSPoints.csv"
   

2. Using your point definition created above, create a DataFrame with specified column names.

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   # Using your csv file, create a DataFrame with specified column names.
   myDataFrame = spark.read.csv(myPointCSV, header=True)
   

3. Return and review the schema for your DataFrame.

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   # Review the schema of your DataFrame
   myDataFrame.printSchema()
   
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    root
    |-- id: long (nullable = true)
    |-- trackid: long (nullable = true)
    |-- longitude: long (nullable = true)
    |-- latitude: long (nullable = true)
    |-- mytime: string (nullable = true)

Create a DataFrame using your own definition

1. Create your own dataset definition containing values for ID, latitude and longitude information, and a timestamp.

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   # Define your own dataset
   myPoints = [(0, -4655711.2806, 222503.076, "01/22/2020 1:00:00 PM"),
   	(1, -4570473.292, 322503.076, "01/22/2020 1:15:00 PM"),
   	(2, -4830838.089, 146545.398, "01/22/2020 1:30:00 PM"),
   	(3, -4570771.608, 116617.112, "01/22/2020 1:45:00 PM"),
   	(4, -4682228.671, 173377.654, "01/22/2020 2:00:00 PM")]
   
   fields = ["id", "latitude", "longitude", "mytime"]
   

2. Create a DataFrame from the CSV using the headers as column names.

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   # Create a DataFrame
   myDataFrame = spark.createDataFrame(myPoints, fields)
   

3. Review your DataFrame. This should reflect the records in your CSV file.

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   # Review your DataFrame
   myDataFrame.show()
   
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   +---+-------------+----------+--------------------+
   | id|     latitude| longitude|              mytime|
   +---+-------------+----------+--------------------+
   |  0|-4655711.2806|222503.076|01/22/2020 1:00:0...|
   |  1| -4570473.292|322503.076|01/22/2020 1:15:0...|
   |  2| -4830838.089|146545.398|01/22/2020 1:30:0...|
   |  3| -4570771.608|116617.112|01/22/2020 1:45:0...|
   |  4| -4682228.671|173377.654|01/22/2020 2:00:0...|
   +---+-------------+----------+--------------------+

Set geometry and time for a DataFrame

Define geometry and time

1. For this example, geometry will be of type point defined by the columns latitude and longitude. The spatial reference ID for the coordinates is 4326. Time is defined using the column mytime and the format MM/dd/yyyy h:mm:ss a. You will be able to use the result (df) as a time- and geometry-enabled DataFrame for input to spatial and temporal functions.

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   # Define geometry and time for your DataFrame
   df = myDataFrame.withColumn("geometry", ST.srid(ST.point("longitude", "latitude"), 4326)) \
                   .st.set_geometry_field("geometry") \
                   .withColumn("timestamp", to_timestamp("mytime", "MM/dd/yyyy h:mm:ss a")).st.set_time_fields("timestamp")
   df.show()
   
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   +---+-------------+----------+--------------------+--------------------+-------------------+
   | id|     latitude| longitude|              mytime|            geometry|          timestamp|
   +---+-------------+----------+--------------------+--------------------+-------------------+
   |  0|-4655711.2806|222503.076|01/22/2020 1:00:0...|{"x":222503.076,"...|2020-01-22 13:00:00|
   |  1| -4570473.292|322503.076|01/22/2020 1:15:0...|{"x":322503.076,"...|2020-01-22 13:15:00|
   |  2| -4830838.089|146545.398|01/22/2020 1:30:0...|{"x":146545.398,"...|2020-01-22 13:30:00|
   |  3| -4570771.608|116617.112|01/22/2020 1:45:0...|{"x":116617.112,"...|2020-01-22 13:45:00|
   |  4| -4682228.671|173377.654|01/22/2020 2:00:0...|{"x":173377.654,"...|2020-01-22 14:00:00|
   +---+-------------+----------+--------------------+--------------------+-------------------+

Investigate and summarize your DataFrame

The examples below show common operations you can perform on DataFrames.

Summarize and understand your data

1. Create a DataFrame from an existing file.

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   # Create a DataFrame from an existing ORC file
   myData = r"c:\MyData\MyORCFile"
   
   df = spark.read.format("orc").load(myData)
   

2. Get the count of rows within your DataFrame.

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   # Get the count of rows in your DataFrame
   df.count()
   
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3. Generate a sample of your data.

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   # Sample your DataFrame
   sample = df.rdd.takeSample(withReplacement=False, num=3)
   
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   [Row(serial_num='1899215N12329', season=1899, num=3, basin='NA', sub_basin='MM', name='NOT NAMED', iso_time='1899-08-30 18:00:00',
   nature='TS', latitude=40.2, longitude=-41.2, wind_wmo_=40.0, pres_wmo_=0, center='atcf', wind_wmo1=42.322, pres_wmo1=-100.0,
   track_type='main', size='40000', Wind=40000, x=-41.2, y=40.2, INSTANT_DATETIME='1899-08-30 18:00:00.000'),
   
   Row(serial_num='1899215N12329', season=1899, num=3, basin='NA', sub_basin='MM', name='NOT NAMED', iso_time='1899-08-17 12:00:00',
   nature='TS', latitude=34.5, longitude=-74.5, wind_wmo_=105.0, pres_wmo_=0, center='atcf', wind_wmo1=94.425, pres_wmo1=-100.0,
   track_type='main', size='105000', Wind=105000, x=-74.5, y=34.5, INSTANT_DATETIME='1899-08-17 12:00:00.000'),
   
   Row(serial_num='1994222N11267', season=1994, num=11, basin='EP', sub_basin='CP', name='JOHN', iso_time='9/10/1994 0:00',
   nature='TS', latitude=41.5, longitude=-171.0, wind_wmo_=60.0, pres_wmo_=0, center='atcf', wind_wmo1=68.854, pres_wmo1=-100.0,
   track_type='main', size='60000', Wind=60000, x=-171.0, y=41.5, INSTANT_DATETIME='1994-09-10 00:00:00.000')]

4. Group your data based on column values.

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   # Group your DataFrame by serial number
   groups = df.groupBy("serial_num")
   

5. Calculate average, maximum, and minimum statistics for your grouped data.

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   # Group your data and calculate group statistics
   groups.avg("wind_wmo_").toDF("SerialNum", "AvgWind").show()
   groups.max("pres_wmo_").toDF("SerialNum", "MaxPres").show()
   groups.min("pres_wmo_").toDF("SerialNum", "MinPres").show()
   
   Result

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   +-------------+-----------------+
   |    sub_basin|          AvgWind|
   +-------------+-----------------+
   |1994222N11267|67.97520661157024|
   |1899215N12329|71.43939393939394|
   +-------------+-----------------+
   
   +-------------+-------+
   |    SerialNum|MaxPres|
   +-------------+-------+
   |1994222N11267|   1010|
   |1899215N12329|    995|
   +-------------+-------+
   
   +-------------+-------+
   |    SerialNum|MinPres|
   +-------------+-------+
   |1994222N11267|     13|
   |1899215N12329|      5|
   +-------------+-------+

Filter and preview your data

1. Filter your data for records with a pressure value greater than or equal to 1000.

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   # Filter your data
   myFilteredDF = df.filter(df["pres_wmo_"] >= 1000)
   

2. Query your filtered result for the columns of interest. Using .collect() returns the values within the column as a list of row values and .show() prints them out as a table.

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   # Select certain columns and collect the data within them
   myFilteredDF.selectExpr("latitude", "longitude").collect()
   
   Result

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   [Row(latitude=11.1, longitude=-97.1),
    Row(latitude=11.2, longitude=-98.2),
    Row(latitude=11.2, longitude=-99.4),
    Row(latitude=11.3, longitude=-100.6),
    Row(latitude=11.5, longitude=-101.7),
    Row(latitude=14.0, longitude=-108.4),
    Row(latitude=14.0, longitude=-109.1),
    Row(latitude=13.9, longitude=-109.9),
    Row(latitude=13.8, longitude=-111.0),
    Row(latitude=13.7, longitude=-114.4),
    Row(latitude=13.7, longitude=-115.4),
    Row(latitude=14.6, longitude=-118.8),
    Row(latitude=15.0, longitude=-119.8),
    Row(latitude=15.3, longitude=-120.9),
    Row(latitude=15.3, longitude=-122.3),
    Row(latitude=15.3, longitude=-124.0),
    Row(latitude=15.3, longitude=-125.7),
    Row(latitude=15.3, longitude=-127.5),
    Row(latitude=15.2, longitude=-129.2)]
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   # Print the columns you have filtered and selected for
   myFilteredDF.selectExpr("latitude", "longitude").show()
   Result

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   +--------+---------+
   |latitude|longitude|
   +--------+---------+
   |    11.1|    -97.1|
   |    11.2|    -98.2|
   |    11.2|    -99.4|
   |    11.3|   -100.6|
   |    11.5|   -101.7|
   |    14.0|   -108.4|
   |    14.0|   -109.1|
   |    13.9|   -109.9|
   |    13.8|   -111.0|
   |    13.7|   -114.4|
   |    13.7|   -115.4|
   |    14.6|   -118.8|
   |    15.0|   -119.8|
   |    15.3|   -120.9|
   |    15.3|   -122.3|
   |    15.3|   -124.0|
   |    15.3|   -125.7|
   |    15.3|   -127.5|
   |    15.2|   -129.2|
   +--------+---------+

What's next?

Learn more about how to set up your data and run tools and SQL functions:

• Read and write shapefiles
• Read from feature services
• Data sources
• SQL functions
• Tools