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ICOADS Archive Practices at NCAR
JCOMM ETMC-III
9-12 February 2010
Steven Worley
Topics
Environment settingData management tools and principles ICOADS NCAR Release 2.5 contributionsBackground CollectionsFuture Challenges
Environment Setting
ICOADS is part of a larger collection called the Research Data Archive (RDA)
RDA – briefly600+ datasets (atmosphere, ocean, geosciences)4.3M files, 462 TB (primary data)6000+ unique users annually, including ICOADSStaff, 7 scientific programmers (M.S. degrees), me,
and administrative assistant
Data management principles
Always archive 2 copies of observational data3rd copy at a partner center (disaster recovery)
Free and open data access world-wide InternetPast – other media, cd-roms, tapes, etc.
Share what we have to build archivesE.g. Digitization of Maury data in China in
exchange for global land surface data
Data Management Tools
• Old System: Specialized Software to manage each data input.• Inefficient• Difficult to Scale
RDAMetadataDatabase
Unidata Server
University Server
NWPServer
Online Disk
Tape Storage
GCMDMetadata
Server
RDA Data Server
Specialized Software
Package 2
Specialized Software
Package 3
Specialized Software
Package 1
• New System: Common RDA tools that homogenize data management.• Efficient• Scalable
RDA Data Management
Common Tool Set
Data Management tools – a few details
Common scripting structure to do routine dataset updates (dsupdt)Very tunable
Frequency, multiple server priority list, validation
Fully integrated with RDADBUsers view is automatically update and therefore always
current
Common single archiving function (dsarch) location and copy control (MSS/HPSS storage, and
online disk)Fills all DB entries (e.g. file and dataset relationships)
Data management tools
Harvest file level metadata (gatherxml)Handle various formats (GRIB1, GRIB2, netCDF,
BUFR, IMMA, ON29, etc.)Save as <xml> and populate DBBenefits
Problem detectionVersioning, replacement, extension
Inventory informationDrive better data service for users
Data management tools
Provide access to data in tape storage archive (dsrqst)Relatively new, not universally available across
RDA - yetDelayed mode – with DB control (many details)Why – RDA holds 462 TB
40 TB online – most popular small scale productsAccess to more products for greater community
ICOADS Release 2.5 contributions @ NCAR
Data Preparation – format evaluations, translate native formats to IMMA formatMoored research buoy delayed mode archives
TOA, PIRATA (PMEL, JAMSTEC)
World Ocean Database 2005Multiple ocean profile types (NODC)
Receive/archive ICOADS data processing resultsNOAA/ESRL does processing - source
merging, duplicate elimination, preconditioning deletion and fixes, etc.
ICOADS Release 2.5 contributions @ NCAR
Create and maintain user data access interfacesFile access
IMMA and binary (observations, monthly summary statistics)
Sub-selection (time, space, parameter)Example coming.Output is ASCII tabular formatRuns automatically – nearly all requests completed in 10
minutes
Keep user metrics
ICOADS Release 2.5 contributions @ NCAR
Near-term preliminary extensions to R2.5Beginning with data in 2008 and forwardBased on NCEP GTS compilation/mergeRuns on day 2 of each month – processes
previous month.Create IMMA observations and binary monthly
summary statisticsHarvest file level metadata Do all archiving of original and processed filesAutomatically, update user interfaces
Brief drive through ICOADS @ NCAR
World-wide User Access
File Level Metadata – ICOADS IMMA Example
File Level Metadata – ICOADS IMMA Example
8 pages of information like this
A look at 2009
What is happening in 2009?
World-wide User Access
Similar service for the monthly summary statistics
Who uses the sub-setting interfaces?2005-2009
58 Countries
Background Collections
HistoricalMost complete set of ALL source data used to
create ALL ICOADS ReleasesBeginning in mid-1980s
Copies of ALL ICOADS Releases We do not delete any files
Background Collections
Ongoing / Routine data receiptsFormat conversions are done at NCDC
Description Source Frequency
Marine Surface GTS NCEP (BUFR) Monthly
Marine Surface GTS NCDC (IMMA) Monthly
SEAS NCDC (IMMA) Monthly
Keyed NCDC (IMMA) Monthly (nominally)
GCC NCDC (IMMA) Quarterly (nominally)
VOSClim NCDC (IMMA) Monthly
Future Challenges
Eliminate user interface dependency on java applets – deploy java script instead.
Support “advanced” ICOADS initiative
Bias adjusted / corrected observations
Serve as a central DB / handle data ingest
Build a user interface
Continue as a full U.S. partner.
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