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measurements

This module contains functions that compute measurements of distance, area and angles. There are also functions to compute geometry values determined by measurements.

ST_ANGLE

ST_ANGLE(startPoint, midPoint, endPoint, mercator)

Description

Finds the angle formed by two adjacent segments defined by 3 points. The result will be the (positive clockwise) angle with origin on the startPoint-midPoint segment, or its explementary angle if required.

  • startPoint: GEOGRAPHY start Point Coordinates.

  • midPoint: GEOGRAPHY mid Point Coordinates.

  • endPoint: GEOGRAPHY end Point Coordinates.

  • mercator: BOOLEAN|NULL if calculations should be performed over Mercator or WGS84 projection. If NULL the default value false is used.

Return type

FLOAT64

Example

SELECT `carto-un`.carto.ST_ANGLE(ST_GEOGPOINT(-3.70325 ,40.4167), ST_GEOGPOINT(-4.70325 ,10.4167), ST_GEOGPOINT(-5.70325 ,40.4167), false);
-- 3.933094586038578

ST_MINKOWSKIDISTANCE

ST_MINKOWSKIDISTANCE(geog, p)

Description

Calculate the Minkowski p-norm distance between two features.

  • geog: ARRAY<GEOGRAPHY> featureCollection.

  • p: FLOAT64 minkowski p-norm distance parameter. 1: Manhattan distance. 2: Euclidean distance. 1 =< p <= infinity. If NULL the default value 2 is used.

Return type

ARRAY<STRING>

Example

SELECT `carto-un`.carto.ST_MINKOWSKIDISTANCE([ST_GEOGPOINT(10,10),ST_GEOGPOINT(13,10)],2);
-- ["0,0.3333333333333333","0.3333333333333333,0"]
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