IEEE Geoscience and Remote Sensing Magazine - September 2016 - 56
uSER COMMuNITY-DRIVEN, LONG-TERM
DATA PRESERVATION AND ACCESS
Beyond providing data-management services to current missions and projects, the D-SDA provides sustainable, long-term
data accessibility. EO data are unique snapshots of the condition of Earth or the atmosphere
at a specific point in time. DLR
and the D-SDA, therefore, put
THE PROjECT SCIENTISTS
particular emphasis on longARE PREDOMINANTLY
term data preservation with the
CONCERNED wITH
objective to keep the valuable
data and products accessible
DEVELOPING AND FINE
and usable for future generaTuNING ALGORITHMS FOR
tions. Preservation is an inherACCuRATE THEMATIC
ent part of the data life cycle,
PRODuCT GENERATION.
with its scope extending beyond keeping the instrument
data safe from loss.
One aspect for ensuring long-term data accessibility in
the D-SDA is its stable and sustainable archive infrastructure.
The hardware and software are maintained and upgraded on
a regular basis following technology evolution cycles. Tape
media, which for economic and safety reasons today are still
widely adopted for archiving with hierarchical storage management at the petabyte scale, are being replaced by a new
generation of tapes at intervals of about five to seven years.
Tape drives and archive servers follow a similar technology
evolution cycle, while the tape library is being replaced approximately every 15-20 years. The modules of the data-management software are maintained in-house on a continuous
basis and upgraded as new technology or protocols emerge.
On the data side, active data curation contributes to
long-term usability. As new requirements arise-from technology evolution, application scientists, or end users-the
data are migrated; converted to new formats; reprocessed
using improved algorithms; transformed into user-friendly,
higher-level products; and made accessible via the required
interfaces. The data curation is based on an appraisal of the
data sets and a preservation plan detailing activities and assessing associated cost and risks.
tAbLe 2. tHe rOLes AND respONsIbILItIes DeFINeD WItHIN tHe tImeLINe prOJeCt.
56
rOLe
DetAILs AND respONsIbILItIes
scientist
* Is a member of the research department
* Develops processing/exploitation algorithms
* Performs algorithm tests on a limited sample data set
* Provides reference data(base) if needed
* Provides level-four support
Tool developer
* Is usually a software engineer within the research department
* Transfers the algorithm into an operational tool
* Performs testing of the tool on a larger number of sample data sets
* Provides level-three support
Software engineer
* May be with the research department or the IT department
* Has knowledge about existing modules and overall system architecture
* Encapsulates and transfers tools into operational modules and processing chains
* Tests modules/chains with a significant number of sample data sets
* Delivers modules to system engineer for approval and integration
* Provides level-two support
System engineer
* Is a member of the IT department
* A nalyzes requirements in collaboration with scientist and software engineer
* Is responsible for the main data repository and for the system framework
* Decides on the development of modules/processing chain
* A pproves new modules from software engineers
* Performs integration tests in a semi-operational test environment
* Is responsible for module/processing chain versioning and deployment
data librarian
* Is responsible for the reference databases
* Verifies and makes available reference databases received from scientists, tool developers,
or software engineers
Operational system engineer
* Is part of the ground segment department or with the customer
* Installs the system received from the system engineer on the production site
* Performs operational system tests with a large number of sample data (~1,000 scenes)
* A pproves readiness for mass production
Operations engineer
* Is part of the ground segment department or with the customer
* Runs the system in the operational environment
* Is responsible for quality assurance
* Provides level-one support
ieee Geoscience and remote sensinG maGazine
september 2016
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