ST_Raster.hasColormap

Definition

The ST_Raster.hasColormap function indicates whether or not the ST_Raster has a color map present. It returns 1 if the color map is present and 0 if it is not.

Syntax

Oracle

hasColormap()

PostgreSQL

hasColormap(raster IN ST_RASTER)

SQL Server

hasColormap()

Returns

Oracle

Number

PostgreSQL

Boolean

SQL Server

Integer

Parameters

raster—The ST_Raster object to be tested

Examples

The following two examples illustrate the use of this function in a SELECT and WHERE clause, respectively:

Oracle

SELECT t.image.raster_id, t.image.hasColormap() 
FROM FOO t;

T.IMAGE.RASTER_ID T.IMAGE.HASCOLORMAP()
---------------    -------------------
              2                   0
              3                   0
             23                   0
             24                   0
             42                   1
             43                   1


SELECT t.image.raster_id
FROM FOO t
WHERE t.image.hasColormap() = 1;

T.IMAGE.RASTER_ID
-----------------
             42
             43

PostgreSQL

SELECT raster_id(image), hasColormap(image) 
FROM foo t;

RASTER_ID(IMAGE) IMAGE.HASCOLORMAP(IMAGE)
---------------- ------------------------
               2                        0
               3                        0
              23                        0
              24                        0
              42                        1
              43                        1

SELECT raster_id(image)
FROM foo
WHERE hasColormap(image) = 1;

RASTER_ID(IMAGE)
----------------
              42
              43

SQL Server

SELECT image.raster_id, image.hasColormap() 
FROM foo;

IMAGE_RASTER_ID  IMAGE.HASCOLORMAP()
---------------- ------------------------
               2                        0
               3                        0
              23                        0
              24                        0
              42                        1
              43                        1

SELECT raster_id(image)
FROM foo
WHERE image.hasColormap() = 1;

 IMAGE.RASTER_ID
 ---------------
              42
              43