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Add a PC_BoundingDiagonal(p pcpatch) function

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Éric Lemoine 2017-04-03 10:15:39 +02:00
parent 4f033847fe
commit 7dd0bccfee
2 changed files with 33 additions and 0 deletions
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23
README.md
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@ -559,6 +559,29 @@ The `pointcloud_postgis` extension adds functions that allow you to use PostgreS
>
> POLYGON((-126.99 45.01,-126.99 45.09,-126.91 45.09,-126.91 45.01,-126.99 45.01))
**PC_BoundingDiagonal(pcpatch)** returns **geometry**
> Returns the bounding diagonal of a patch. This is a LineString (2D), a LineString Z or a LineString M or a LineString ZM, based on the existence of the Z and M dimensions in the patch. This function is useful for creating an index on a patch column.
>
> SELECT ST_AsText(PC_BoundingDiagonal(pa)) FROM patches;
> st_astext
> ------------------------------------------------
> LINESTRING Z (-126.99 45.01 1,-126.91 45.09 9)
> LINESTRING Z (-126 46 100,-126 46 100)
> LINESTRING Z (-126.2 45.8 80,-126.11 45.89 89)
> LINESTRING Z (-126.4 45.6 60,-126.31 45.69 69)
> LINESTRING Z (-126.3 45.7 70,-126.21 45.79 79)
> LINESTRING Z (-126.8 45.2 20,-126.71 45.29 29)
> LINESTRING Z (-126.5 45.5 50,-126.41 45.59 59)
> LINESTRING Z (-126.6 45.4 40,-126.51 45.49 49)
> LINESTRING Z (-126.9 45.1 10,-126.81 45.19 19)
> LINESTRING Z (-126.7 45.3 30,-126.61 45.39 39)
> LINESTRING Z (-126.1 45.9 90,-126.01 45.99 99)
> (11 rows)gq
>
> For example, this is how one may want to create an index:
>
> CREATE INDEX ON patches USING GIST(PC_BoundingDiagonal(patch) gist_geometry_ops_nd);
## Compressions ##

10
pgsql_postgis/pointcloud_postgis--1.0.sql
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@ -54,3 +54,13 @@ CREATE OR REPLACE FUNCTION PC_Intersects(geometry, pcpatch)
SELECT PC_Intersects($2, $1)
$$
LANGUAGE 'sql';
-----------------------------------------------------------------------------
-- Function from pcpatch to LineString
--
CREATE OR REPLACE FUNCTION PC_BoundingDiagonal(pcpatch)
RETURNS geometry AS
$$
SELECT ST_GeomFromEWKB(PC_BoundingDiagonalAsBinary($1))
$$
LANGUAGE 'sql';