>  Docs Center  >  Libraries  >  ASTROLIB  >  SXGINFO

SXGINFO

SXGINFO

Name


SXGINFO

Purpose


Return information on all group parameters in an STSDAS header.

Explanation


Return datatype, starting byte, and number bytes for all group
parameters in an STSDAS file. Obtaining these values
greatly speed up execution time in subsequent calls to SXGPAR.

Calling Sequence


sxginfo, h, par, type, sbyte, nbytes

Inputs


h - header returned by SXOPEN
par - parameter block returned by SXREAD or multiple
parameter blocks stored in array of dimension
greater than one.

Output


type - data type (if not supplied or null string, the
header is searched for type,sbyte, and nbytes)
sbyte - starting byte in parameter block for data
nbytes - number of bytes in parameter block for data
The number of elements in type,sbyte and nbytes equals the total
number of group parameters.

Method


The parameter type for each parameter is obtained
from PDTYPEn keyword. If not found then DATATYPE keyword
value is used. If that is not found then BITPIX is
used. BITPIX=8, byte; BITPIX=16 integer*2; BITPIX=32
integer*4.

Notes


For an example of the use of SXGINFO, see CONV_STSDAS

History


version 1 W. Landsman Apr. 93
Converted to IDL V5.0 W. Landsman September 1997



© 2019 Harris Geospatial Solutions, Inc. |  Legal
My Account    |    Store    |    Contact Us