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Connecting large data bases to users through open-source, web-based tools Part I. Annette Schloss Institute for the Study of Earth, Oceans and Space. Our goals: To broaden the user base of large, scientific data sets and improve our own access to data and analysis tools. MODIS. IKONOS.

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Connecting large data bases

to users through open-source,

web-based tools

Part I

Annette Schloss

Institute for the Study of Earth, Oceans and Space


Our goals: To broaden the user base of large,

scientific data sets

and improve our own access to data and analysis tools

MODIS

IKONOS


Goals for IPCC Data Access

data

information


Methods - good, bad, and ugly!

data

  • Aggregate data in time and space

  • Create customized products

  • Embed information in pictures

Aggregate data in time and space

information


Climate Impacts from the

NCAR Community Climate Model

Model Runs

20C simulation

100+yr scenarios

Annual & decadal

map products

Regional trends

& time-lines

5 ensembles

3-hourly

6-hourly

daily

monthly

Data reduction for the NCAR IPCC climate runs


Methods - good, bad, and ugly!

data

  • Aggregate data in time and space

  • Create customized products

  • Embed information in pictures

Create customized products

information






Geotiff Example

  • 1.4 degree grid

  • One+ time-steps (1 shown)

  • Only grids that overlay France

Data reduction and reformatting


Next Steps:

Make these services

Web-accessible

New workflows needed


Methods - good, bad, and ugly!

data

  • Aggregate data in time and space

  • Create customized products

  • Embed information in pictures

Embed information in pictures

information


8-bits of Information

Chlorophyll

  • MODIS satellite image

  • Scaled exponentially 1-255

  • Bad data, no data = 0


8-bits of Information

8-bit Gif = 680 Kb

HDF-EOS = 6.5 Mb

NetCDF = 32 Mb

Chlorophyll

mg/m3

0

1

60

0

255

Reasonable representation of chlorophyll




Results

data

  • Data stream greatly reduced

  • Information for many uses is not lost

information


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