h3_centerasgeojson function

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Applies to: check marked yes Databricks SQL check marked yes Databricks Runtime 11.3 LTS and above

Returns the center of the input H3 cell as a point in GeoJSON format.

Syntax

h3_centerasgeojson ( h3CellIdExpr )

Arguments

  • h3CellIdExpr: A BIGINT expression, or a hexadecimal STRING expression representing an H3 cell ID.

Returns

A value of the type STRING representing the center of the input H3 cell as a point in GeoJSON format.

The function returns NULL if the input expression is NULL. The function does partial validation regarding whether the input argument is a valid H3 cell ID. A necessary, but not sufficient condition for a valid H3 ID is that its value is between 0x08001fffffffffff and 0x08ff3b6db6db6db6. The behavior of the function is undefined if the input cell ID is not a valid cell ID.

Error conditions

  • If h3CellIdExpr is a STRING that cannot be converted to a BIGINT or corresponds to a BIGINT value that is either smaller than 0x08001fffffffffff or larger than 0x08ff3b6db6db6db6, the function returns H3_INVALID_CELL_ID.

Examples

-- Input a BIGINT representing a hexagonal cell.
> SELECT h3_centerasgeojson(599686042433355775)
  {"type":"Point","coordinates":[-121.97637597255,37.345793375368]}

-- Input a STRING representing a pentagonal cell.
> SELECT h3_centerasgeojson('8009fffffffffff')
  {"type":"Point","coordinates":[10.536199075468,64.700000127935]}

-- Input is an invalid H3 cell ID.
> SELECT h3_centerasgeojson(0)
  [H3_INVALID_CELL_ID] 0 is not a valid H3 cell ID