PDS_VERSION_ID         = PDS3
RECORD_TYPE            = STREAM
OBJECT                 = TEXT
  PUBLICATION_DATE     = 1998-07-01
  INTERCHANGE_FORMAT   = ASCII
  NOTE                 = "Description of the BROWSE directory
                          contents and browser information."
END_OBJECT             = TEXT
END


		      BROWSE Directory Contents

The BROWSE directory contains a directory structure identical to the
data directories on this CD.  At the top level of this BROWSE
directory are HTML formatted files which form the top level of the
Mars Pathfinder IMP Image Browser.  More HTML files, for use in
searching for images, are located in the target directories.  Each
directory that contains HTML files also contains a PDS label
describing those files.

Each lowest level directory contains GIF and JPEG formatted versions
of the PDS archive images in the corresponding data directory, as well
as HTML browse pages for those images.  Each collection of 1 GIF
image, 1 JPEG image, and 1 HTML file is described by a PDS label.

The BROWSE directory also contains an ICONS directory, which contains
GIF-formatted icons used throughout the browser.


       Information About the Mars Pathfinder IMP Image Browser

The files in this directory are a series of HTML files that provide a
simple method for browsing through the Mars Pathfinder image archive.
The system is designed to be viewable by many WWW browsers.  Browsers
must be able to handle HTML tables in order to view the pages
properly.  To start the image browser, open the INDEX.HTM file from
this directory in your WWW browser.  If you need detailed instructions
on using this image browser, there is additional help available in the
HELP.HTM file.  There is a separate image browser for the images on
each CD volume.

Two versions of each PDS archive image exist in the browse
subdirectories. "Thumbnail" images are reduced size images used on the
image observation pages; "browse" images are full size images used on
the browse pages. The browse images were created from the PDS archive
images by reducing them from 12-bit to 8-bit and converting them to
GIF format. The thumbnail images were converted to 8-bit, scaled down
to maximum dimensions of 50 pixels in height or 100 pixels in width
(retaining the original aspect ratio), and then converting them to
JPEG format. The choice was made to use both GIF and JPEG formats, so
that for a given PDS archive image, both browse images, an HTML file,
and a PDS label, could all be stored in the same directory with the
same file name.

There are six different types of pages in this image browser.  The top
page (file INDEX.HTM) is the starting point.  It has general
information about the browser structure.  It also links to the
definition page, help page, and target pages.  The definition page
contains keyword definitions for parameters from the PDS image labels
that are used in this browser.  The help page explains the components
of the browser and how to navigate through the browser.  Each target
directory has a target page (file INDEX.HTM) that links to the image
observation pages.  The observation pages are located in the same
directory as the target page and are named using the first five
characters of the target, followed by three digits that increment for
each observation. Finally, in the lowest level directories, each image
has a page that displays the image along with keywords and values from
the PDS label.