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PDSREAD (dataio) PDS Reader PDSREAD (dataio)
NAME
pdsread -- Convert Kitt Peak PDS image files to IRAF image files
USAGE
pds [pds_file, file_list, iraf_file]
DESCRIPTION
Kitt Peak PDS format image data is read from the specified source,
either a disk file or magnetic tape. The PDS header may
optionally be printed on the standard output as either a full
listing or a short description. Image data may optionally be
converted to an IRAF image of specified data type.
PARAMETERS
pds_file
The PDS data source. If the data source is a disk file or an
explict tape file specification of the form mt*[n] where n is
a file number then only that file is converted. If the
general tape device name is given, i.e. mta, mtb800, etc,
then the files specified by the files parameter will be read
from the tape.
file_list
The files to be read from a tape are specified by the
file_list string. The string can consist of any sequence of
file numbers separated by at least one of whitespace, comma,
or dash. A dash specifies a range of files. For example the
string
1 2, 3 - 5,8-6
will convert the files 1 through 8.
iraf_file
The IRAF file which will receive the PDS data if the
read_image parameter switch is set. For tape files specified
by the file_list parameter the filename will be used as a
prefix and the file number will be appended. Otherwise, the
file will be named as specified. Thus, reading files 1 and 3
from a PDS tape with a filename of data will produce the
files data1 and data3. It is legal to use a null filename.
read_image
This switch determines whether PDS image data is converted to
-1-
PDSREAD (dataio) PDS Reader PDSREAD (dataio)
an IRAF image file. This switch is set to no to obtain just
header information with the long_header or short_header
switches.
long_header
If this switch is set the full PDS header is printed on the
standard output.
short_header
If this switch is set only the output filename, the title
string, and the image dimensions are printed.
standard_format
The PDS standard format has the most significant byte first.
data_type
The IRAF image file may be of a different data type than the
PDS image data. The data type may be specified as s for
short, l for long, and r for real. The user must beware of
truncation problems if an inappropriate data type is
specified. If an incorrect data_type or a null string is
given for this parameter then a default data type is used
which is the appropriate minimum size for the input pixel
values.
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