Help for PLAB2TCL

PURPOSE:
plab2tcl gets a value (int, double, or string) and puts it into
a TAE TCL variable.  The value is a GeoTIFF parameter in the
VICAR label.  These are always found in the VICAR state label
under the property "GEOTIFF".

If the selection is not found, or wrong type, etc., a special value
of -999 (int) -999.0 (real) or "-999" (character string) is output
to the TAE TCL variable.

Multiple occurrences of the GeoTIFF keyword are selected by the
parameter element (since VICAR calls these elements) and which 
item in a vector is handled by the parameter sequence.
EXECUTION:

Examples

plab2tcl AUSTRALIA val=s1 keyword=GTRASTERTYPEGEOKEY vtype=0

          gets the rastertype from the file AUSTRALIA and puts
          into the TCL variable s1 as a string

plab2tcl AUSTRALIA val=n1 keyword=GTRASTERTYPEGEOKEY vtype=4

          gets the rastertype from the file AUSTRALIA and puts
          into the TCL variable n1 as an integer (converts
          the string to an integer)

OPERATION:
plab2tcl reads the part of the VICAR label that contains the
GeoTIFF information and tries to find the keyword (case 
insensitive).   When found, the value is placed in the output
parameter.  Type conversion is performed according to the user
request in the parameter vtype.

Any errors cause -999 (int), -999.0 (real), or "-999" (string)
to  be placed in the output parameter.
 TIMING: 

Less than one second.  

 ORIGINAL PROGRAMMER:    A. Zobrist          02 Feb 2004
 COGNIZANT PROGRAMMER:   A. Zobrist          02 Feb 2004
 
 REVISION HISTORY
  2008-01-02 WLB Switched to USES_ANSI_C AND LIB_CARTO; misc cleanup.
  2015-12-14 WLB Migrated to MIPL.