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Tag: refpurpose
Apply a 3D affine transformation to a geometry.
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Valid trajectories are expected as input to spatio-temporal functions like <xref linkend="ST_ClosestPointOfApproach"/>
 
Returns a measure at the closest point of approach of two trajectories.
 
Returns the smallest measure at which points interpolated along the given trajectories are the least distance apart.
 
Inputs must be valid trajectories as checked by <xref linkend="ST_IsValidTrajectory"/>. Null is returned if the trajectories do not overlap in their M ranges.
 
To obtain the actual points at the computed measure use <xref linkend="ST_LocateAlong"/> .
 
, <xref linkend="ST_DistanceCPA"/>, <xref linkend="ST_LocateAlong"/>, <xref linkend="ST_AddMeasure"/>
 
Returns the distance between the closest point of approach of two trajectories.
 
Returns the distance (in 2D) between two trajectories at their closest point of approach.
 
, <xref linkend="ST_ClosestPointOfApproach"/>, <xref linkend="ST_AddMeasure"/>, <xref linkend="geometry_distance_cpa"/>
 
Tests if the closest point of approach of two trajectories is within the specified distance.
 
Tests whether two moving objects have ever been closer than the specified distance.
 
Inputs must be valid trajectories as checked by <xref linkend="ST_IsValidTrajectory"/>. False is returned if the trajectories do not overlap in their M ranges.
 
, <xref linkend="ST_ClosestPointOfApproach"/>, <xref linkend="ST_DistanceCPA"/>, <xref linkend="geometry_distance_cpa"/>
 
Affine Transformations
Аффинные преобразования
These functions change the position and shape of geometries using <link xlink:href="https://en.wikipedia.org/wiki/Affine_transformation">affine transformations</link>.
 
Apply a 3D affine transformation to a geometry.
Провести трёхмерное аффинное преобразование данной геометрии
Applies a 3D affine transformation to the geometry to do things like translate, rotate, scale in one step.
 
Version 1: The call <programlisting>ST_Affine(geom, a, b, c, d, e, f, g, h, i, xoff, yoff, zoff) </programlisting> represents the transformation matrix <programlisting>/ a b c xoff \
| d e f yoff |
| g h i zoff |
\ 0 0 0 1 /</programlisting> and the vertices are transformed as follows: <programlisting>x' = a*x + b*y + c*z + xoff
y' = d*x + e*y + f*z + yoff
z' = g*x + h*y + i*z + zoff</programlisting> All of the translate / scale functions below are expressed via such an affine transformation.
 
Version 2: Applies a 2d affine transformation to the geometry. The call <programlisting>ST_Affine(geom, a, b, d, e, xoff, yoff)</programlisting> represents the transformation matrix <programlisting>/ a b 0 xoff \ / a b xoff \
| d e 0 yoff | rsp. | d e yoff |
| 0 0 1 0 | \ 0 0 1 /
\ 0 0 0 1 /</programlisting> and the vertices are transformed as follows: <programlisting>x' = a*x + b*y + xoff
y' = d*x + e*y + yoff
z' = z </programlisting> This method is a subcase of the 3D method above.
 
Availability: 1.1.2. Name changed from Affine to ST_Affine in 1.2.2
 
, <xref linkend="ST_Scale"/>, <xref linkend="ST_Translate"/>, <xref linkend="ST_TransScale"/>
 
Rotates a geometry about an origin point.
 
Rotates geometry rotRadians counter-clockwise about the origin point. The rotation origin can be specified either as a POINT geometry, or as x and y coordinates. If the origin is not specified, the geometry is rotated about POINT(0 0).
 
Enhanced: 2.0.0 additional parameters for specifying the origin of rotation were added.
 
Availability: 1.1.2. Name changed from Rotate to ST_Rotate in 1.2.2
 
, <xref linkend="ST_RotateX"/>, <xref linkend="ST_RotateY"/>, <xref linkend="ST_RotateZ"/>
 
Rotates a geometry about the X axis.
 
Rotates a geometry geomA - rotRadians about the X axis.
 
<code>ST_RotateX(geomA, rotRadians)</code> is short-hand for <code>ST_Affine(geomA, 1, 0, 0, 0, cos(rotRadians), -sin(rotRadians), 0, sin(rotRadians), cos(rotRadians), 0, 0, 0)</code>.
 
Availability: 1.1.2. Name changed from RotateX to ST_RotateX in 1.2.2
 
, <xref linkend="ST_RotateY"/>, <xref linkend="ST_RotateZ"/>
 

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  1. postgis
  2. PostGIS Manual
  3. Russian
Apply a 3D affine transformation to a geometry.
Провести трёхмерное аффинное преобразование данной геометрии
a year ago
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Tag: refpurpose
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no-c-format
String age
a year ago
Last updated
a year ago
Source string age
a year ago
Translation file
doc/po/ru/postgis-manual.po, string 4913