Mosaic's grid_boundary method returns inconsistent geometries

kll — Thu, 06 Jul 2023 21:37:15 GMT

I am applying mosaic's `grid_boundary` method on a spark DataFrame containing a set of `h3_hex_ids`. The geometries returned are not consistent. i.e they could be either `lat, long` or `long, lat`.

Here's a sample data

```
import pyspark.sql.functions as F
import h3

# Create a Spark DataFrame with a h3_hex_id column
df = spark.createDataFrame([
("point1", 612232698081050623),
("point2", 611987238200279039),
("point3", 612252103481491455)),
], ["name", "h3_hex_id"])

# Get Polygon geometries
df1 = df.withColumn("geometry", grid_boundary(col("h3_hex_id"), format_name=F.lit("WKT")))
df1.show()

```

This is causing a few issues with downstream tasks like spatial joins. Why are the geometries returned by `grid_boundary` method not consistent?

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Mosaic's grid_boundary method returns inconsistent geometries