H3 Geohashing

Copy-paste examples of H3 geohashing data with SQL

Enrich a Point-Based Table with H3 Indexes

Create an H3 index for pickup locations in the NYC taxi data set.

Lat/Lon-Based Table
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CREATE OR REPLACE TABLE example_geospatial.nyctaxi_h3 AS
(
      SELECT
            pickup_latitude,
            pickup_longitude,
            STXY_H3(pickup_longitude, pickup_latitude, 8) AS h3_index
      FROM example_geospatial.nyctaxi_xy
)
WKT-Based Table
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CREATE OR REPLACE TABLE example_geospatial.nyctaxi_h3 AS
(
      SELECT
            pickup_location,
            ST_H3(pickup_location, 8) AS h3_index
      FROM example_geospatial.nyctaxi_wkt
)

Create an Aggregated View with WKT Geometries

Use the table created above to generate an H3 grid view with the counts of pickups within each cell.

Aggregated Pick-Up Counts per H3 Cell
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SELECT
      h3_index,
      ST_GEOMFROMH3(h3_index) AS h3_cell,
      COUNT(*) AS total_pickups
FROM example_geospatial.nyctaxi_h3
GROUP BY h3_index

The H3 grid output as a class break render:

geohash-h3.png