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* Update of english version of descriprion of the table function `file`. * New syntax for ReplacingMergeTree. Some improvements in text. * Significantly change article about SummingMergeTree. Article is restructured, text is changed in many places of the document. New syntax for table creation is described. * Descriptions of AggregateFunction and AggregatingMergeTree are updated. Russian version. * New syntax for new syntax of CREATE TABLE * Added english docs on Aggregating, Replacing and SummingMergeTree. * CollapsingMergeTree docs. English version. * 1. Update of CollapsingMergeTree. 2. Minor changes in markup * Update aggregatefunction.md * Update aggregatefunction.md * Update aggregatefunction.md * Update aggregatingmergetree.md * GraphiteMergeTree docs update. New syntax for creation of Replicated* tables. Minor changes in *MergeTree tables creation syntax. * Markup fix * Markup and language fixes * Clarification in the CollapsingMergeTree article * DOCAPI-4821. Sync between ru and en versions of docs. * Fixed the ambiguity in geo functions description. * Example of JOIN in ru docs * Deleted misinforming example.
103 lines
3.6 KiB
Markdown
103 lines
3.6 KiB
Markdown
# Functions for working with geographical coordinates
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## greatCircleDistance
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Calculate the distance between two points on the Earth's surface using [the great-circle formula](https://en.wikipedia.org/wiki/Great-circle_distance).
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```
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greatCircleDistance(lon1Deg, lat1Deg, lon2Deg, lat2Deg)
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```
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**Input parameters**
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- `lon1Deg` — Longitude of the first point in degrees. Range: `[-180°, 180°]`.
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- `lat1Deg` — Latitude of the first point in degrees. Range: `[-90°, 90°]`.
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- `lon2Deg` — Longitude of the second point in degrees. Range: `[-180°, 180°]`.
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- `lat2Deg` — Latitude of the second point in degrees. Range: `[-90°, 90°]`.
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Positive values correspond to North latitude and East longitude, and negative values correspond to South latitude and West longitude.
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**Returned value**
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The distance between two points on the Earth's surface, in meters.
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Generates an exception when the input parameter values fall outside of the range.
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**Example**
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``` sql
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SELECT greatCircleDistance(55.755831, 37.617673, -55.755831, -37.617673)
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```
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```
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┌─greatCircleDistance(55.755831, 37.617673, -55.755831, -37.617673)─┐
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│ 14132374.194975413 │
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└───────────────────────────────────────────────────────────────────┘
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```
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## pointInEllipses
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Checks whether the point belongs to at least one of the ellipses.
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```
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pointInEllipses(x, y, x₀, y₀, a₀, b₀,...,xₙ, yₙ, aₙ, bₙ)
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```
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**Input parameters**
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- `x, y` — Coordinates of a point on the plane.
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- `xᵢ, yᵢ` — Coordinates of the center of the `i`-th ellipsis.
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- `aᵢ, bᵢ` — Axes of the `i`-th ellipsis in meters.
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The input parameters must be `2+4⋅n`, where `n` is the number of ellipses.
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**Returned values**
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`1` if the point is inside at least one of the ellipses; `0`if it is not.
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**Example**
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``` sql
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SELECT pointInEllipses(55.755831, 37.617673, 55.755831, 37.617673, 1.0, 2.0)
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```
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```
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┌─pointInEllipses(55.755831, 37.617673, 55.755831, 37.617673, 1., 2.)─┐
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│ 1 │
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└─────────────────────────────────────────────────────────────────────┘
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```
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## pointInPolygon
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Checks whether the point belongs to the polygon on the plane.
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```
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pointInPolygon((x, y), [(a, b), (c, d) ...], ...)
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```
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**Input values**
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- `(x, y)` — Coordinates of a point on the plane. Data type — [Tuple](../../data_types/tuple.md#data_type-tuple) — A tuple of two numbers.
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- `[(a, b), (c, d) ...]` — Polygon vertices. Data type — [Array](../../data_types/array.md#data_type-array). Each vertex is represented by a pair of coordinates `(a, b)`. Vertices should be specified in a clockwise or counterclockwise order. The minimum number of vertices is 3. The polygon must be constant.
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- The function also supports polygons with holes (cut out sections). In this case, add polygons that define the cut out sections using additional arguments of the function. The function does not support non-simply-connected polygons.
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**Returned values**
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`1` if the point is inside the polygon, `0` if it is not.
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If the point is on the polygon boundary, the function may return either 0 or 1.
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**Example**
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``` sql
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SELECT pointInPolygon((3., 3.), [(6, 0), (8, 4), (5, 8), (0, 2)]) AS res
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```
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```
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┌─res─┐
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│ 1 │
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└─────┘
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```
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[Original article](https://clickhouse.yandex/docs/en/query_language/functions/geo/) <!--hide-->
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