Syntax

   @RasterGCP([REJECTABLE],<mode>[,<coord_sys>,<gcp_value>])
   
Arguments

   REJECTABLE

      Specifies if the function will supply a rejection code and message
      to the invalid feature and output it to the rejected port, or will
      fail upon being supplied invalid features.

      A feature can be rejected for the following reasons:
         - The feature has invalid geometry

   <mode>   
   
      SET | GET
   
      A string that specifies whether the function will set the GCP on the 
      raster or retrieve the GCP from the raster
   
   <coord_sys> 
   
      Source Coordinate System   
      
      A string value specifying the source coordinate system. Optional if the 
      <mode> is GET.
   
   <gcp_value> 
   
      UInt UInt Reals Reals Reals   
      
      A string value specifying the GCP(s). Each GCP is separated with a semi-
      colon and each value of a 5-value GCP is separated by a space. Optional if 
      the <mode> is GET.

Description

   The @RasterGCP function is used to set or get the Ground Control Points (GCP) 
   from the raster. The <gcp_value> is formatted as a 5 value string. Each GCP 
   is separated with a semi-colon and each value in a GCP is separated by a 
   space. Below is an example of a <gcp_value>: 

      pixel(column) line(row) X-Coord Y-Coord Z-Coord

   In SET mode, <coord_sys> and <gcp_value> must be specified. This mode sets 
   GCP(s) onto the raster. If the raster already has existing GCP(s), they will 
   be overwritten with the new GCP(s).

   In GET mode, both the <coord_sys> and <gcp_value> are optional parameters. 
   This function retrieves the GCP(s) from the raster.

   Input features must contain raster geometries only.