pggeodb.nancy.inra.fr/db_cefs - db_cefs on pggeodb.nancy.inra.fr

Function: st_summary

Schema

public

Owner

postgres

Descriptions

args: rast - Returns a text summary of the contents of the raster.

Options

Definition

CREATE OR REPLACE FUNCTION public.st_summary (
 rast public.raster
)
RETURNS text AS
$span$
DECLARE
extent box2d;
metadata record;
bandmetadata record;
msg text;
msgset text[];
BEGIN
extent := ST_Extent(rast::geometry);
metadata := ST_Metadata(rast);

msg := 'Raster of ' || metadata.width || 'x' || metadata.height || ' pixels has ' || metadata.numbands || ' ';

IF metadata.numbands = 1 THEN
msg := msg || 'band ';
ELSE
msg := msg || 'bands ';
END IF;
msg := msg || 'and extent of ' || extent;

IF
round(metadata.skewx::numeric, 10) <> round(0::numeric, 10) OR
round(metadata.skewy::numeric, 10) <> round(0::numeric, 10)
THEN
msg := 'Skewed ' || overlay(msg placing 'r' from 1 for 1);
END IF;

msgset := Array[]::text[] || msg;

FOR bandmetadata IN SELECT * FROM ST_BandMetadata(rast, ARRAY[]::int[]) LOOP
msg := 'band ' || bandmetadata.bandnum || ' of pixtype ' || bandmetadata.pixeltype || ' is ';
IF bandmetadata.isoutdb IS FALSE THEN
msg := msg || 'in-db ';
ELSE
msg := msg || 'out-db ';
END IF;

msg := msg || 'with ';
IF bandmetadata.nodatavalue IS NOT NULL THEN
msg := msg || 'NODATA value of ' || bandmetadata.nodatavalue;
ELSE
msg := msg || 'no NODATA value';
END IF;

msgset := msgset || ('    ' || msg);
END LOOP;

RETURN array_to_string(msgset, E'\n');
END;
$span$
LANGUAGE 'plpgsql'
STABLE
RETURNS NULL ON NULL INPUT
SECURITY INVOKER
COST 100;

COMMENT ON FUNCTION public.st_summary(rast public.raster)
IS 'args: rast - Returns a text summary of the contents of the raster.';

This file was generated with SQL Manager for PostgreSQL (www.pgsqlmanager.com) at 13/03/2014 13:23