Analytics Toolbox for Snowflake

Analytics Toolbox for Snowflake

quadbin

You can learn more about quadbins in the Overview section of the documentation.

QUADBIN_BBOX

Description

Returns an array with the boundary box of a given quadbin. This boundary box contains the minimum and maximum longitude and latitude. The output format is [West-South, East-North] or [min long, min lat, max long, max lat].

  • quadbin: BIGINT quadbin to get the bbox from.

Return type

ARRAY<FLOAT64>

Example

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SELECT carto.QUADBIN_BBOX(5209574053332910079);
-- 22.5
-- -21.943045533438166
-- 45.0
-- 0.0

QUADBIN_BOUNDARY

Description

Returns the boundary for a given quadbin. We extract the boundary in the same way as when we calculate its QUADBIN_BBOX, then enclose it in a GeoJSON and finally transform it into a geography.

  • quadbin: BIGINT quadbin to get the boundary geography from.

Return type

GEOGRAPHY

Example

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SELECT carto.QUADBIN_BOUNDARY(5209574053332910079);
-- POLYGON((22.5 0, 22.5 -21.9430455334382, 45 -21.9430455334382, 45 0, 22.5 0))

QUADBIN_CENTER

Description

Returns the center for a given quadbin. The center is defined as the intersection point of the four immediate children quadbin.

  • quadbin: BIGINT quadbin to get the center from.

Return type

GEOGRAPHY

Example

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SELECT carto.QUADBIN_CENTER(5209574053332910079);
-- POINT(33.75 -11.1784018737118)

QUADBIN_FROMGEOGPOINT

Description

Returns the quadbin of a given point at a given level of detail.

  • point: GEOGRAPHY point to get the quadbin from.
  • resolution: INT level of detail or zoom.

Return type

BIGINT

Example

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SELECT carto.QUADBIN_FROMGEOGPOINT(ST_GEOGPOINT(40.4168, -3.7038), 4);
-- 5209574053332910079

QUADBIN_FROMLONGLAT

Description

Returns the quadbin representation for a given level of detail and geographic coordinates.

  • longitude: FLOAT64 horizontal coordinate of the map.
  • latitude: FLOAT64 vertical coordinate of the map.
  • resolution: INT level of detail or zoom.

Return type

BIGINT

Example

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SELECT carto.QUADBIN_FROMLONGLAT(40.4168, -3.7038, 4);
-- 5209574053332910079

QUADBIN_FROMZXY

Description

Returns a quadbin from z, x, y coordinates.

  • z: INT zoom level.
  • x: INT horizontal position of a tile.
  • y: INT vertical position of a tile.

Constraints

Tile coordinates x and y depend on the zoom level z. For both coordinates, the minimum value is 0, and the maximum value is two to the power of z, minus one (2^z - 1).

Return type

BIGINT

Example

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SELECT carto.QUADBIN_FROMZXY(4, 9, 8);
-- 5209574053332910079

QUADBIN_ISVALID

Description

Returns true when the given index is valid, false otherwise.

  • quadbin: BIGINT quadbin index.

Return type

BOOLEAN

Example

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SELECT carto.QUADBIN_ISVALID(5209574053332910079);
-- true
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SELECT carto.QUADBIN_ISVALID(1234);
-- false

QUADBIN_KRING

Description

Returns all cell indexes in a filled square k-ring centered at the origin in no particular order.

  • origin: BIGINT quadbin index of the origin.
  • size: INT size of the ring (distance from the origin).

Return type

ARRAY

Example

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SELECT carto.QUADBIN_KRING(5209574053332910079, 1);
-- 5208043533147045887
-- 5209556461146865663
-- 5209591645518954495
-- 5208061125333090303
-- 5209574053332910079
-- 5209609237704998911
-- 5208113901891223551
-- 5209626829891043327
-- 5209662014263132159

QUADBIN_KRING_DISTANCES

Description

Returns all cell indexes and their distances in a filled square k-ring centered at the origin in no particular order.

  • origin: BIGINT quadbin index of the origin.
  • size: INT size of the ring (distance from the origin).

Return type

ARRAY

Example

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SELECT carto.QUADBIN_KRING_DISTANCES(5209574053332910079, 1);
-- {"index": "5208043533147045887", "distance": "1"}
-- {"index": "5209556461146865663", "distance": "1"}
-- {"index": "5209591645518954495", "distance": "1"}
-- {"index": "5208061125333090303", "distance": "1"}
-- {"index": "5209574053332910079", "distance": "0"}
-- {"index": "5209609237704998911", "distance": "1"}
-- {"index": "5208113901891223551", "distance": "1"}
-- {"index": "5209626829891043327", "distance": "1"}
-- {"index": "5209662014263132159", "distance": "1"}

QUADBIN_POLYFILL

Description

Returns an array of quadbins that intersect with the given geography at a given level of detail.

  • geography: GEOGRAPHY geography to extract the quadbins from.
  • resolution: INT level of detail or zoom.

Return type

ARRAY<BIGINT>

Example

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SELECT carto.QUADBIN_POLYFILL(
    ST_GEOGFROMTEXT('POLYGON ((-3.71219873428345 40.413365349070865, -3.7144088745117 40.40965661286395, -3.70659828186035 40.409525904775634, -3.71219873428345 40.413365349070865))'),
    17);
-- 5265786693153193983
-- 5265786693163941887
-- 5265786693164466175
-- 5265786693164204031
-- 5265786693164728319
-- 5265786693165514751

QUADBIN_RESOLUTION

Description

Returns the resolution of the input quadbin.

  • quadbin: BIGINT quadbin from which to get resolution.

Return type

INT

Example

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SELECT carto.QUADBIN_RESOLUTION(5209574053332910079);
-- 4

QUADBIN_SIBLING

Description

Returns the quadbin directly next to the given quadbin at the same zoom level. The direction must be sent as argument and currently only horizontal/vertical movements are allowed.

  • quadbin: BIGINT quadbin to get the sibling from.
  • direction: STRING ‘right’|‘left’|‘up’|‘down’ direction to move in to extract the next sibling.

Return type

BIGINT

Example

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SELECT carto.QUADBIN_SIBLING(5209574053332910079, 'up');
-- 5208061125333090303

QUADBIN_TOCHILDREN

Description

Returns an array with the children quadbins of a given quadbin for a specific resolution. A children quadbin is a quadbin of higher level of detail that is contained by the current quadbin. Each quadbin has four children by definition.

  • quadbin: BIGINT quadbin to get the children from.
  • resolution: INT resolution of the desired children.

Return type

ARRAY

Example

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SELECT carto.QUADBIN_TOCHILDREN(5209574053332910079, 5);
-- 5214064458820747263
-- 5214073254913769471
-- 5214068856867258367
-- 5214077652960280575

QUADBIN_TOPARENT

Description

Returns the parent quadbin of a given quadbin for a specific resolution. A parent quadbin is the smaller resolution containing quadbin.

  • quadbin: BIGINT quadbin to get the parent from.
  • resolution: INT resolution of the desired parent.

Return type

BIGINT

Example

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SELECT carto.QUADBIN_TOPARENT(5209574053332910079, 3);
-- 5205105638077628415

QUADBIN_TOZXY

Description

Returns the zoom level z and coordinates x, y for a given quadbin.

  • quadbin: BIGINT quadbin we want to extract tile information from.

Return type

STRUCT<INT, INT, INT>

Example

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SELECT carto.QUADBIN_TOZXY(5209574053332910079);
-- z  x  y
-- 4  9  8