Standards Change Request
 
Add new keyword BROWSE_USAGE_ID                           SCR3-1128.v1
 
Provenance:
-----------
 
Date: 2007-08-01
Author(s): Ed Guinness (Geosciences)
Working Group: Ed Guinness, Steve Hughes, David Heather (ESA/PSA)
 
 
Problem:
--------
 
The PSA is receiving data sets for MEX, VEX, and Rosetta that have more than
one browse product per data product. There are also cases in which one browse
product is associated with more than one data product. The PSA would like to
have information in the browse label and browse index table to indicate which
browse product should be displayed in their user interface. Currently the MEX
local data dictionary has a keyword called BROWSE_USAGE_ID that serves this
purpose. This keyword also allows the user to understand how browse images
are related to data products when there is not a one-to-one correspondence.
Given that VEX and Rosetta would also like to use this keyword, the PSA
proposes that BROWSE_USAGE_ID be moved from the MEX LDD to the PSDD. The
reference provided by the PSA describes the issue and proposed solution
in more detail.
 
Current Urgency:
----------------
 
The deadline of December 31, 2007, is given because VEX and Rosetta need
to know by then whether to put this keyword in their local data dictionaries.
 
Proposed Solution:
------------------
 
Move the keyword BROWSE_USAGE_ID as defined below from the MEX LDD to the
PSDD.
 
Impact Assessment:
------------------
 
PDS Standards Reference: None.
Archive Preparation Guide: None.
Proposer's Archive Guide: None.
Planetary Science Data Dictionary: New keyword definition.
PDS Tools: None.
 
Additional Information:
-----------------------
 
See PDF document submitted with this SCR:
 
"Planetary Science Archive: Browse Product Handling in the Planetary Science
Archive (PSA) SOP-RSSD-TN-044 Issue 1.0 11 May 2007"
 
Requested Changes:
------------------
 
OBJECT = ELEMENT_DEFINITION
  NAME = BROWSE_USAGE_ID
  STATUS_TYPE = PROPOSED
  GENERAL_DATA_TYPE = IDENTIFIER
  UNIT_ID = NONE
  STANDARD_VALUE_TYPE = DYNAMIC
  MAXIMUM_LENGTH = 40
  DESCRIPTION = "
      The BROWSE_USAGE_ID keyword defines whether a browse product is intended
      to be the primary browse product for an associated data product, or is a
      secondary browse product, for cases when there are multiple browse
      products per data product. The keyword is an optional keyword that can 
      be included in the label for a browse product along with the keyword
      SOURCE_PRODUCT_ID to identify the data product. The value of
      BROWSE_USAGE_ID along with the value of SOURCE_PRODUCT_ID could be used
      in user interfaces to display browse products resulting from a search."
  STANDARD_VALUE_SET = {
     "PRIMARY",
     "SECONDARY",
     "N/A"
     }
END_OBJECT = ELEMENT_DEFINITION
END