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Documentation Index

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Use this file to discover all available pages before exploring further.

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H3 Index

H3 is a geographical indexing system where the Earth’s surface is divided into a grid of even hexagonal cells. This system is hierarchical, i. e. each hexagon on the top level (“parent”) can be split into seven even but smaller ones (“children”), and so on. The level of the hierarchy is called resolution and can receive a value from 0 till 15, where 0 is the base level with the largest and coarsest cells. A latitude and longitude pair can be transformed to a 64-bit H3 index, identifying a grid cell. The H3 index is used primarily for bucketing locations and other geospatial manipulations. The full description of the H3 system is available at the Uber Engineering site.

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h3IsValid

Verifies whether the number is a valid H3 index. Syntax 
h3IsValid(h3index)
Parameter
  • h3index — Hexagon index number. UInt64.
Returned values
  • 1 — The number is a valid H3 index. UInt8.
  • 0 — The number is not a valid H3 index. UInt8.
Example Query: 
SELECT h3IsValid(630814730351855103) AS h3IsValid;
Result: 
┌─h3IsValid─┐
│         1 │
└───────────┘

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h3GetResolution

Defines the resolution of the given H3 index. Syntax 
h3GetResolution(h3index)
Parameter
  • h3index — Hexagon index number. UInt64.
Returned values
  • Index resolution. Range: [0, 15]. UInt8.
  • If the index is not valid, the function returns a random value. Use h3IsValid to verify the index. UInt8.
Example Query: 
SELECT h3GetResolution(639821929606596015) AS resolution;
Result: 
┌─resolution─┐
│         14 │
└────────────┘

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h3EdgeAngle

Calculates the average length of an H3 hexagon edge in grades. Syntax 
h3EdgeAngle(resolution)
Parameter
  • resolution — Index resolution. UInt8. Range: [0, 15].
Returned values
  • The average length of an H3 hexagon edge in grades. Float64.
Example Query: 
SELECT h3EdgeAngle(10) AS edgeAngle;
Result: 
┌───────h3EdgeAngle(10)─┐
│ 0.0005927224846720883 │
└───────────────────────┘

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h3EdgeLengthM

Calculates the average length of an H3 hexagon edge in meters. Syntax 
h3EdgeLengthM(resolution)
Parameter
  • resolution — Index resolution. UInt8. Range: [0, 15].
Returned values
  • The average edge length of an H3 hexagon in meters. Float64.
Example Query: 
SELECT h3EdgeLengthM(15) AS edgeLengthM;
Result: 
┌─edgeLengthM─┐
│ 0.509713273 │
└─────────────┘

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h3EdgeLengthKm

Calculates the average length of an H3 hexagon edge in kilometers. Syntax 
h3EdgeLengthKm(resolution)
Parameter
  • resolution — Index resolution. UInt8. Range: [0, 15].
Returned values
  • The average length of an H3 hexagon edge in kilometers. Float64.
Example Query: 
SELECT h3EdgeLengthKm(15) AS edgeLengthKm;
Result: 
┌─edgeLengthKm─┐
│  0.000509713 │
└──────────────┘

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geoToH3

Returns H3 point index (lat, lon) with specified resolution. Syntax 
geoToH3(lat, lon, resolution)
Arguments
  • lat — Latitude. Float64.
  • lon — Longitude. Float64.
  • resolution — Index resolution. Range: [0, 15]. UInt8.
Returned values Note: In ClickHouse v25.4 or older, geoToH3() takes values in order (lon, lat). As per ClickHouse v25.5, the input values are in order (lat, lon). The previous behaviour can be restored using setting geotoh3_argument_order = 'lon_lat'. Example Query: 
SELECT geoToH3(55.71290588, 37.79506683, 15) AS h3Index;
Result: 
┌────────────h3Index─┐
│ 644325524701193974 │
└────────────────────┘

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h3ToGeo

Returns the centroid latitude and longitude corresponding to the provided H3 index. Syntax 
h3ToGeo(h3Index)
Arguments
  • h3Index — H3 Index. UInt64.
Returned values
  • A tuple consisting of two values: tuple(lat,lon). lat — Latitude. Float64. lon — Longitude. Float64.
Note: In ClickHouse v24.12 or older, h3ToGeo() returns values in order (lon, lat). As per ClickHouse v25.1, the returned values are in order (lat, lon). The previous behaviour can be restored using setting h3togeo_lon_lat_result_order = true. Example Query: 
SELECT h3ToGeo(644325524701193974) AS coordinates;
Result: 
┌─coordinates───────────────────────────┐
│ (55.71290243145668,37.79506616830252) │
└───────────────────────────────────────┘

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h3ToGeoBoundary

Returns array of pairs (lat, lon), which corresponds to the boundary of the provided H3 index. Syntax 
h3ToGeoBoundary(h3Index)
Arguments
  • h3Index — H3 Index. UInt64.
Returned values Example Query: 
SELECT h3ToGeoBoundary(644325524701193974) AS coordinates;
Result: 
┌─h3ToGeoBoundary(599686042433355775)────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ [(37.2713558667319,-121.91508032705622),(37.353926450852256,-121.8622232890249),(37.42834118609435,-121.92354999630156),(37.42012867767779,-122.03773496427027),(37.33755608435299,-122.090428929044),(37.26319797461824,-122.02910130919001)] │
└────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

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h3kRing

Lists all the H3 hexagons in the raduis of k from the given hexagon in random order. Syntax 
h3kRing(h3index, k)
Arguments
  • h3index — Hexagon index number. UInt64.
  • k — Radius. integer
Returned values Example Query: 
SELECT arrayJoin(h3kRing(644325529233966508, 1)) AS h3index;
Result: 
┌────────────h3index─┐
│ 644325529233966508 │
│ 644325529233966497 │
│ 644325529233966510 │
│ 644325529233966504 │
│ 644325529233966509 │
│ 644325529233966355 │
│ 644325529233966354 │
└────────────────────┘

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h3PolygonToCells

Returns the hexagons (at specified resolution) contained by the provided geometry, either ring or (multi-)polygon. Syntax 
h3PolygonToCells(geometry, resolution)
Arguments Returned values Example Query: 
SELECT h3PolygonToCells([(-122.4089866999972145,37.813318999983238),(-122.3544736999993603,37.7198061999978478),(-122.4798767000009008,37.8151571999998453)], 7) AS h3index;
Result: 
┌────────────h3index─┐
│ 608692970769612799 │
│ 608692971927240703 │
│ 608692970585063423 │
│ 608692970819944447 │
│ 608692970719281151 │
│ 608692970752835583 │
│ 608692972027903999 │
└────────────────────┘

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h3GetBaseCell

Returns the base cell number of the H3 index. Syntax 
h3GetBaseCell(index)
Parameter
  • index — Hexagon index number. UInt64.
Returned value
  • Hexagon base cell number. UInt8.
Example Query: 
SELECT h3GetBaseCell(612916788725809151) AS basecell;
Result: 
┌─basecell─┐
│       12 │
└──────────┘

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h3HexAreaM2

Returns average hexagon area in square meters at the given resolution. Syntax 
h3HexAreaM2(resolution)
Parameter
  • resolution — Index resolution. Range: [0, 15]. UInt8.
Returned value Example Query: 
SELECT h3HexAreaM2(13) AS area;
Result: 
┌─area─┐
│ 43.9 │
└──────┘

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h3HexAreaKm2

Returns average hexagon area in square kilometers at the given resolution. Syntax 
h3HexAreaKm2(resolution)
Parameter
  • resolution — Index resolution. Range: [0, 15]. UInt8.
Returned value
  • Area in square kilometers. Float64.
Example Query: 
SELECT h3HexAreaKm2(13) AS area;
Result: 
┌──────area─┐
│ 0.0000439 │
└───────────┘

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h3IndexesAreNeighbors

Returns whether or not the provided H3 indexes are neighbors. Syntax 
h3IndexesAreNeighbors(index1, index2)
Arguments
  • index1 — Hexagon index number. UInt64.
  • index2 — Hexagon index number. UInt64.
Returned value
  • 1 — Indexes are neighbours. UInt8.
  • 0 — Indexes are not neighbours. UInt8.
Example Query: 
SELECT h3IndexesAreNeighbors(617420388351344639, 617420388352655359) AS n;
Result: 
┌─n─┐
│ 1 │
└───┘

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h3ToChildren

Returns an array of child indexes for the given H3 index. Syntax 
h3ToChildren(index, resolution)
Arguments
  • index — Hexagon index number. UInt64.
  • resolution — Index resolution. Range: [0, 15]. UInt8.
Returned values Example Query: 
SELECT h3ToChildren(599405990164561919, 6) AS children;
Result: 
┌─children───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ [603909588852408319,603909588986626047,603909589120843775,603909589255061503,603909589389279231,603909589523496959,603909589657714687] │
└────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

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h3ToParent

Returns the parent (coarser) index containing the given H3 index. Syntax 
h3ToParent(index, resolution)
Arguments
  • index — Hexagon index number. UInt64.
  • resolution — Index resolution. Range: [0, 15]. UInt8.
Returned value Example Query: 
SELECT h3ToParent(599405990164561919, 3) AS parent;
Result: 
┌─────────────parent─┐
│ 590398848891879423 │
└────────────────────┘

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h3ToString

Converts the H3Index representation of the index to the string representation. 
h3ToString(index)
Parameter
  • index — Hexagon index number. UInt64.
Returned value
  • String representation of the H3 index. String.
Example Query: 
SELECT h3ToString(617420388352917503) AS h3_string;
Result: 
┌─h3_string───────┐
│ 89184926cdbffff │
└─────────────────┘

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stringToH3

Converts the string representation to the H3Index (UInt64) representation. Syntax 
stringToH3(index_str)
Parameter
  • index_str — String representation of the H3 index. String.
Returned value
  • Hexagon index number. Returns 0 on error. UInt64.
Example Query: 
SELECT stringToH3('89184926cc3ffff') AS index;
Result: 
┌──────────────index─┐
│ 617420388351344639 │
└────────────────────┘

​
h3GetResolution

Returns the resolution of the H3 index. Syntax 
h3GetResolution(index)
Parameter
  • index — Hexagon index number. UInt64.
Returned value
  • Index resolution. Range: [0, 15]. UInt8.
Example Query: 
SELECT h3GetResolution(617420388352917503) AS res;
Result: 
┌─res─┐
│   9 │
└─────┘

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h3IsResClassIII

Returns whether H3 index has a resolution with Class III orientation. Syntax 
h3IsResClassIII(index)
Parameter
  • index — Hexagon index number. UInt64.
Returned value
  • 1 — Index has a resolution with Class III orientation. UInt8.
  • 0 — Index doesn’t have a resolution with Class III orientation. UInt8.
Example Query: 
SELECT h3IsResClassIII(617420388352917503) AS res;
Result: 
┌─res─┐
│   1 │
└─────┘

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h3IsPentagon

Returns whether this H3 index represents a pentagonal cell. Syntax 
h3IsPentagon(index)
Parameter
  • index — Hexagon index number. UInt64.
Returned value
  • 1 — Index represents a pentagonal cell. UInt8.
  • 0 — Index doesn’t represent a pentagonal cell. UInt8.
Example Query: 
SELECT h3IsPentagon(644721767722457330) AS pentagon;
Result: 
┌─pentagon─┐
│        0 │
└──────────┘

​
h3GetFaces

Returns icosahedron faces intersected by a given H3 index. Syntax 
h3GetFaces(index)
Parameter
  • index — Hexagon index number. UInt64.
Returned values
  • Array containing icosahedron faces intersected by a given H3 index. Array(UInt64).
Example Query: 
SELECT h3GetFaces(599686042433355775) AS faces;
Result: 
┌─faces─┐
│ [7]   │
└───────┘

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h3CellAreaM2

Returns the exact area of a specific cell in square meters corresponding to the given input H3 index. Syntax 
h3CellAreaM2(index)
Parameter
  • index — Hexagon index number. UInt64.
Returned value
  • Cell area in square meters. Float64.
Example Query: 
SELECT h3CellAreaM2(579205133326352383) AS area;
Result: 
┌───────────────area─┐
│ 4106166334463.9233 │
└────────────────────┘

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h3CellAreaRads2

Returns the exact area of a specific cell in square radians corresponding to the given input H3 index. Syntax 
h3CellAreaRads2(index)
Parameter
  • index — Hexagon index number. UInt64.
Returned value
  • Cell area in square radians. Float64.
Example Query: 
SELECT h3CellAreaRads2(579205133326352383) AS area;
Result: 
┌────────────────area─┐
│ 0.10116268528089567 │
└─────────────────────┘

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h3ToCenterChild

Returns the center child (finer) H3 index contained by given H3 at the given resolution. Syntax 
h3ToCenterChild(index, resolution)
Parameter
  • index — Hexagon index number. UInt64.
  • resolution — Index resolution. Range: [0, 15]. UInt8.
Returned values
  • H3 index of the center child contained by given H3 at the given resolution. UInt64.
Example Query: 
SELECT h3ToCenterChild(577023702256844799,1) AS centerToChild;
Result: 
┌──────centerToChild─┐
│ 581496515558637567 │
└────────────────────┘

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h3ExactEdgeLengthM

Returns the exact edge length of the unidirectional edge represented by the input h3 index in meters. Syntax 
h3ExactEdgeLengthM(index)
Parameter
  • index — Hexagon index number. UInt64.
Returned value
  • Exact edge length in meters. Float64.
Example Query: 
SELECT h3ExactEdgeLengthM(1310277011704381439) AS exactEdgeLengthM;;
Result: 
┌───exactEdgeLengthM─┐
│ 195449.63163407316 │
└────────────────────┘

​
h3ExactEdgeLengthKm

Returns the exact edge length of the unidirectional edge represented by the input h3 index in kilometers. Syntax 
h3ExactEdgeLengthKm(index)
Parameter
  • index — Hexagon index number. UInt64.
Returned value
  • Exact edge length in kilometers. Float64.
Example Query: 
SELECT h3ExactEdgeLengthKm(1310277011704381439) AS exactEdgeLengthKm;;
Result: 
┌──exactEdgeLengthKm─┐
│ 195.44963163407317 │
└────────────────────┘

​
h3ExactEdgeLengthRads

Returns the exact edge length of the unidirectional edge represented by the input h3 index in radians. Syntax 
h3ExactEdgeLengthRads(index)
Parameter
  • index — Hexagon index number. UInt64.
Returned value
  • Exact edge length in radians. Float64.
Example Query: 
SELECT h3ExactEdgeLengthRads(1310277011704381439) AS exactEdgeLengthRads;;
Result: 
┌──exactEdgeLengthRads─┐
│ 0.030677980118976447 │
└──────────────────────┘

​
h3NumHexagons

Returns the number of unique H3 indices at the given resolution. Syntax 
h3NumHexagons(resolution)
Parameter
  • resolution — Index resolution. Range: [0, 15]. UInt8.
Returned value
  • Number of H3 indices. Int64.
Example Query: 
SELECT h3NumHexagons(3) AS numHexagons;
Result: 
┌─numHexagons─┐
│       41162 │
└─────────────┘

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h3PointDistM

Returns the “great circle” or “haversine” distance between pairs of GeoCoord points (latitude/longitude) pairs in meters. Syntax 
h3PointDistM(lat1, lon1, lat2, lon2)
Arguments
  • lat1, lon1 — Latitude and Longitude of point1 in degrees. Float64.
  • lat2, lon2 — Latitude and Longitude of point2 in degrees. Float64.
Returned values
  • Haversine or great circle distance in meters.Float64.
Example Query: 
SELECT h3PointDistM(-10.0 ,0.0, 10.0, 0.0) AS h3PointDistM;
Result: 
┌──────h3PointDistM─┐
│ 2223901.039504589 │
└───────────────────┘

​
h3PointDistKm

Returns the “great circle” or “haversine” distance between pairs of GeoCoord points (latitude/longitude) pairs in kilometers. Syntax 
h3PointDistKm(lat1, lon1, lat2, lon2)
Arguments
  • lat1, lon1 — Latitude and Longitude of point1 in degrees. Float64.
  • lat2, lon2 — Latitude and Longitude of point2 in degrees. Float64.
Returned values
  • Haversine or great circle distance in kilometers. Float64.
Example Query: 
SELECT h3PointDistKm(-10.0 ,0.0, 10.0, 0.0) AS h3PointDistKm;
Result: 
┌─────h3PointDistKm─┐
│ 2223.901039504589 │
└───────────────────┘

​
h3PointDistRads

Returns the “great circle” or “haversine” distance between pairs of GeoCoord points (latitude/longitude) pairs in radians. Syntax 
h3PointDistRads(lat1, lon1, lat2, lon2)
Arguments
  • lat1, lon1 — Latitude and Longitude of point1 in degrees. Float64.
  • lat2, lon2 — Latitude and Longitude of point2 in degrees. Float64.
Returned values
  • Haversine or great circle distance in radians. Float64.
Example Query: 
SELECT h3PointDistRads(-10.0 ,0.0, 10.0, 0.0) AS h3PointDistRads;
Result: 
┌────h3PointDistRads─┐
│ 0.3490658503988659 │
└────────────────────┘

​
h3GetRes0Indexes

Returns an array of all the resolution 0 H3 indexes. Syntax 
h3GetRes0Indexes()
Returned values
  • Array of all the resolution 0 H3 indexes. Array(UInt64).
Example Query: 
SELECT h3GetRes0Indexes AS indexes ;
Result: 
┌─indexes─────────────────────────────────────┐
│ [576495936675512319,576531121047601151,....]│
└─────────────────────────────────────────────┘

​
h3GetPentagonIndexes

Returns all the pentagon H3 indexes at the specified resolution. Syntax 
h3GetPentagonIndexes(resolution)
Parameter
  • resolution — Index resolution. Range: [0, 15]. UInt8.
Returned value Example Query: 
SELECT h3GetPentagonIndexes(3) AS indexes;
Result: 
┌─indexes────────────────────────────────────────────────────────┐
│ [590112357393367039,590464201114255359,590816044835143679,...] │
└────────────────────────────────────────────────────────────────┘

​
h3Line

Returns the line of indices between the two indices that are provided. Syntax 
h3Line(start,end)
Parameter
  • start — Hexagon index number that represents a starting point. UInt64.
  • end — Hexagon index number that represents an ending point. UInt64.
Returned value Array of h3 indexes representing the line of indices between the two provided indices. Array(UInt64). Example Query: 
 SELECT h3Line(590080540275638271,590103561300344831) AS indexes;
Result: 
┌─indexes────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ [590080540275638271,590080471556161535,590080883873021951,590106516237844479,590104385934065663,590103630019821567,590103561300344831] │
└────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

​
h3Distance

Returns the distance in grid cells between the two indices that are provided. Syntax 
h3Distance(start,end)
Parameter
  • start — Hexagon index number that represents a starting point. UInt64.
  • end — Hexagon index number that represents an ending point. UInt64.
Returned value
  • Number of grid cells. Int64.
Returns a negative number if finding the distance fails. Example Query: 
 SELECT h3Distance(590080540275638271,590103561300344831) AS distance;
Result: 
┌─distance─┐
│        7 │
└──────────┘

​
h3HexRing

Returns the indexes of the hexagonal ring centered at the provided origin h3Index and length k. Returns 0 if no pentagonal distortion was encountered. Syntax 
h3HexRing(index, k)
Parameter
  • index — Hexagon index number that represents the origin. UInt64.
  • k — Distance. UInt64.
Returned values Example Query: 
 SELECT h3HexRing(590080540275638271, toUInt16(1)) AS hexRing;
Result: 
┌─hexRing─────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ [590080815153545215,590080471556161535,590080677714591743,590077585338138623,590077447899185151,590079509483487231] │
└─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

​
h3GetUnidirectionalEdge

Returns a unidirectional edge H3 index based on the provided origin and destination and returns 0 on error. Syntax 
h3GetUnidirectionalEdge(originIndex, destinationIndex)
Parameter
  • originIndex — Origin Hexagon index number. UInt64.
  • destinationIndex — Destination Hexagon index number. UInt64.
Returned value
  • Unidirectional Edge Hexagon Index number. UInt64.
Example Query: 
 SELECT h3GetUnidirectionalEdge(599686042433355775, 599686043507097599) AS edge;
Result: 
┌────────────────edge─┐
│ 1248204388774707199 │
└─────────────────────┘

​
h3UnidirectionalEdgeIsValid

Determines if the provided H3Index is a valid unidirectional edge index. Returns 1 if it’s a unidirectional edge and 0 otherwise. Syntax 
h3UnidirectionalEdgeisValid(index)
Parameter
  • index — Hexagon index number. UInt64.
Returned value
  • 1 — The H3 index is a valid unidirectional edge. UInt8.
  • 0 — The H3 index is not a valid unidirectional edge. UInt8.
Example Query: 
 SELECT h3UnidirectionalEdgeIsValid(1248204388774707199) AS validOrNot;
Result: 
┌─validOrNot─┐
│          1 │
└────────────┘

​
h3GetOriginIndexFromUnidirectionalEdge

Returns the origin hexagon index from the unidirectional edge H3Index. Syntax 
h3GetOriginIndexFromUnidirectionalEdge(edge)
Parameter
  • edge — Hexagon index number that represents a unidirectional edge. UInt64.
Returned value
  • Origin Hexagon Index number. UInt64.
Example Query: 
 SELECT h3GetOriginIndexFromUnidirectionalEdge(1248204388774707197) AS origin;
Result: 
┌─────────────origin─┐
│ 599686042433355773 │
└────────────────────┘

​
h3GetDestinationIndexFromUnidirectionalEdge

Returns the destination hexagon index from the unidirectional edge H3Index. Syntax 
h3GetDestinationIndexFromUnidirectionalEdge(edge)
Parameter
  • edge — Hexagon index number that represents a unidirectional edge. UInt64.
Returned value
  • Destination Hexagon Index number. UInt64.
Example Query: 
 SELECT h3GetDestinationIndexFromUnidirectionalEdge(1248204388774707197) AS destination;
Result: 
┌────────destination─┐
│ 599686043507097597 │
└────────────────────┘

​
h3GetIndexesFromUnidirectionalEdge

Returns the origin and destination hexagon indexes from the given unidirectional edge H3Index. Syntax 
h3GetIndexesFromUnidirectionalEdge(edge)
Parameter
  • edge — Hexagon index number that represents a unidirectional edge. UInt64.
Returned value A tuple consisting of two values tuple(origin,destination):
  • origin — Origin Hexagon index number. UInt64.
  • destination — Destination Hexagon index number. UInt64.
Returns (0,0) if the provided input is not valid. Example Query: 
 SELECT h3GetIndexesFromUnidirectionalEdge(1248204388774707199) AS indexes;
Result: 
┌─indexes─────────────────────────────────┐
│ (599686042433355775,599686043507097599) │
└─────────────────────────────────────────┘

​
h3GetUnidirectionalEdgesFromHexagon

Provides all of the unidirectional edges from the provided H3Index. Syntax 
h3GetUnidirectionalEdgesFromHexagon(index)
Parameter
  • index — Hexagon index number that represents a unidirectional edge. UInt64.
Returned value Array of h3 indexes representing each unidirectional edge. Array(UInt64). Example Query: 
 SELECT h3GetUnidirectionalEdgesFromHexagon(1248204388774707199) AS edges;
Result: 
┌─edges─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ [1248204388774707199,1320261982812635135,1392319576850563071,1464377170888491007,1536434764926418943,1608492358964346879] │
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

​
h3GetUnidirectionalEdgeBoundary

Returns the coordinates defining the unidirectional edge. Syntax 
h3GetUnidirectionalEdgeBoundary(index)
Parameter
  • index — Hexagon index number that represents a unidirectional edge. UInt64.
Returned value Example Query: 
 SELECT h3GetUnidirectionalEdgeBoundary(1248204388774707199) AS boundary;
Result: 
┌─boundary────────────────────────────────────────────────────────────────────────┐
│ [(37.42012867767779,-122.03773496427027),(37.33755608435299,-122.090428929044)] │
└─────────────────────────────────────────────────────────────────────────────────┘