passive microwave data @ report to the polar daac advisory group podag xxii, june 2-4, 2004 boulder,...
TRANSCRIPT
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Passive Microwave Data @
Report to the Polar DAAC Advisory Group
PoDAG XXII, June 2-4, 2004 Boulder, CO
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Overview
• Material originally compiled in response to a request from Waleed to host a workshop.
• This presentation is intended to provide a summary of activities and share information that may be used for future planning and decision making.
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Activities
• Undertook two primary activities to gather information for the workshop: Development of a bibliography Statistics to determine how many users and
what products were accessed
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Bibliography
• Conducted a limited search and compiled results from 2 different databases (Engineering Village 2 and Web of Science)
• 545 citations were returned • All names contained in a reference were compared to user list.
If at least one name appeared on our list, the reference was categorized as a 'yes' for NSIDC User.
• The user list used for comparison totaled 1488 individuals • 434 citations or 80% were identified as NSIDC Users
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Summary: Bibliography
• The bibliography can be a useful indication of usage of data sets and be a useful product for the user community
• The bibliography in this presentation is only partial based on two reference search services
• It is time consuming and resource intensive to compile and maintain
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Products
NSIDC NASATeam (NNT) & NSIDC Bootstrap (NBT)DMSP Daily and Monthly Sea Ice Concentrations
http://nsidc.org/data/nsidc-0002.html
GSFC NASATeam (GNT)Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave
http://nsidc.org/data/nsidc-0051.html
GSFC Bootstrap (GBT)Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I
http://nsidc.org/data/nsidc-0079.html
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Products and Distribution Methods
• NNT & NBT Sea Ice Pre-packaged CD-ROMs
o Can determine how many users and who they areo Can't determine which algorithm used
Switched to FTPo Can determine which algorithms, # hosts, # of files and
volume distributedo Can't determine how many users or who they are
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Products and Distribution Methods
• GBT Sea Ice Distributed via FTP only
o Can determine algorithm, # hosts, # of files and volume distributed
o Can't determine how many users or who they are
• GNT Sea Ice Distributed on CD-ROM only
o Can determine algorithm usedo Can determine how many users and who they are
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User Statistics: Data Request Tracking System
• Based on data request tracking system(does not incorporate ftp logs): 1376 individual users 1605 requests (including subscriptions) Tb data requests
o 490 users, 575 requests Sea Ice data requests
o 965 users, 1323 requestso Not possible to identify algorithm used
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User Statistics: FTP
• The following chart illustrates the total number of files and volume of all of the passive microwave products by fiscal year
• Number of files and volume affected by how the data are organized and whether or not compressed. Different data sets organized differently over time
• Shows a steady increase due to updates, transition in distribution methods (CD to FTP) and new products released
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Passive Microwave: Number of Files and Megabytes Transferred via FTPFY 1996 - FY 2003
0
20000
40000
60000
80000
100000
120000
140000
FY 1996 FY 1997 FY 1998 FY 1999 FY 2000 FY 2001 FY 2002 FY 2003
# of Files
Mybtes
Total Files 391,163 Total Mbytes 180,889
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Statistics: FTP
• The following chart illustrates a comparison of FTP statistics for the NSIDC-produced sea ice products with the GBT sea ice data for the period April 2001 - February 2004
• GNT data were distributed on CD-ROM during this time period and had 77 requests for the data set, 210 in total since the product was released
• The larger number of files distributed associated with the NNT algorithm is attributed to differences in the way the data are organized.
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There were 77 requests for the GNT CD-ROMs during this time period.
GSFC BT
NSIDC-BT
NSIDC-NT
0
5000
10000
15000
20000
25000
FTP Distribution by ProductApril 2001 - February 2004
Hosts
Mbytes
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Summary: Digital Data
• Our conclusion is that there is fairly evenly distributed use of the four products by the user community based on the information that we have available
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Summary: Digital Data
• It is difficult to determine access to the data based on algorithm because of differing or changing distribution methods
• It is difficult to distinguish between products, though we have recently implemented a system that should make it easier to report in the future