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Title
Proceedings of the Symposium on Global and Environmental Monitoring

491
(CCSDS), and others, in order to take advantage
of the work of these organizations.
EOSDIS will be a major component of the overall
U.S. interagency approach to data management as
part of the U.S. Global Change Research Program.
The Interagency Working Group on Data Management
for Global Change (IWGDMGC), which reports as an
ad-hoc group to the White House OSTP/Committee
on Earth Sciences (CES), is currently developing
an implementation approach for a U.S. Global
Change Data and Information System (GCDIS) which
will link the federal agency data systems, in
cluding EOSDIS, into an interoperating system,
with common interfaces, practices, and standards
where these can be shown to be beneficial in
facilitating user access to the agencies' data
holdings. Interagency agreements between NASA
and USGS, and between NASA and NOAA, have been
developed to begin as early as possible in
designing common agency approaches to management
of data in the EOS era. Agreements are cur
rently being developed with other organizations
and international partners to ensure wide par
ticipation in EOSDIS implementation and to
encourage open data exchange policies.
6 EARLY-EOSDIS PROGRAM
The Early-EOSDIS program, beginning in 1990 and
continuing until the first EOS platform launch,
will encompass the production of pathfinder data
sets, establishment of initial system elements
which will provide substantially improved ser
vices to users, and integration of metadata,
communications, standards, and other features.
This will be accomplished in four phases leading
up to the fully operational capability at
launch. A preliminary outline of these phases
is given below. Further details will be
provided in a Program Plan currently under
development by NASA Headquarters.
Phase 1 - from early 1990 through Phase C/D con
tract award in mid-1992. During this period ser
vices to users of existing NASA systems (e.g.
NODS, NCDS, PLDS, SDCS) will be augmented, and
new IMS and DAAC functions added. Initial in
frastructure such as connecting networks and
standards for software, documentation, and data
formats will be implemented. Pathfinder data
sets will be generated and archived, and devel
opment plans for the DAACs will be established
through agreements with the institutions in
volved.
Phase 2 - from the end of Phase 1 to initial
EOSDIS functionality in early 1994. During this
period initial deliveries by the Phase C/D con
tractor will occur. New capabilities will be
placed in service as they gain acceptance by the
EOSDIS project, the DAACs, and participating
scientists. This phase will culminate in the
availablity of working capabilities (albeit at
less than full capacity) for all EOSDIS data
production, archiving, and distribution func
tions .
Phase 3 - from the end of Phase 2 to full func
tionality for the DAACs, IMS, and SCFs in early
1995. During this period EOS investigators will
be working on algorithms, algorithm software
will be migrating to the DAACs for implementa
tion, and integration and testing of the soft
ware will occur.
Phase 4 - from the end of Phase 3 to full EOSDIS
functionality and capacity at EOS-A launch in
1997. During this phase, final deliveries of
all EOSDIS elements will be completed, integra
tion and testing of all functions, including
command and control, will occur, and system
readiness tests will be completed.
During all four phases the major emphasis will
be on improving scientific productivity through
the assurance of timely, reliable, and facile
access to data.
ACKNOWLEGEMENTS
The authors wish to acknowlege the contributions
of all EOS science investigators, project, and
program personnel in developing the EOSDIS con
ceptual framework. The contents of this paper
draw significantly on work performed by EOSDIS
project and contractor personnel during the
EOSDIS Phase A and B study phases. The EOSDIS
Program at NASA Headquarters is under the direc
tion of Dr. Dixon M. Butler.
REFERENCES
NASA, 1988a. NASA Earth Science and Applica
tions Division: The Program and Plans for FY
1988-1989-1990. National Aeronautics and Space
Administration, Code SE, Washington, DC 20546.
NASA, 1988b. Earth System Science - A Program
for Global Change: A Closer View. Report of the
Earth System Sciences Committee, NASA Advisory
Council, National Aeronautics and Space Admin
istration, Washington, DC 20546.