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Andrew Bingham Bob Deen, Kevin Hussey Tim Stough, Sean McCleese, Ed Armstrong, Alex Cervantes

Using Datacasting to Acquire Only the GHRSST Products You Care About http://datacasting.jpl.nasa.gov. Presented at the GHRSST Science Team Meeting, Melbourne May 2007. Andrew Bingham Bob Deen, Kevin Hussey Tim Stough, Sean McCleese, Ed Armstrong, Alex Cervantes.

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Andrew Bingham Bob Deen, Kevin Hussey Tim Stough, Sean McCleese, Ed Armstrong, Alex Cervantes

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  1. Using Datacasting to Acquire Only the GHRSST Products You Care Abouthttp://datacasting.jpl.nasa.gov Presented at the GHRSST Science Team Meeting, Melbourne May 2007 Andrew Bingham Bob Deen, Kevin Hussey Tim Stough, Sean McCleese, Ed Armstrong, Alex Cervantes Funded through NASA ROSES/ACCESS Program

  2. Podcasting Metaphor

  3. Overview • Subscribe • XML feeds list available files within a data set and are updated as new files are made available • Feed uses the RSS standard, with extensions that describe • The content of the data for filtering • The location of the file for downloading • The format of the files for data extraction • Download by Content • Files are automatically downloaded to client as they become available • User-defined filters select which files are downloaded (e.g. only files with high clear sky fraction and/or contains an algae bloom) • Filters are hierarchical, which gives meaning to the filter selections • Manage & Visualize • Downloaded files are placed in a meaningful (or user-defined) directory structure • Data are extracted from the file and visualized within the client • Possible plug-in for viewing data overlays in Google Earth

  4. System Configuration • Data provider creates XML feeds and provides access to files using the Datacasting server software • Users subscribe and download relevant files using the Datacasting client software

  5. The Datacasting Server • Simplifies publishing of feeds to the Datacasting/RSS specification • A set of easy to use, portable, Python based tools for publishing your data • Text based configuration file specifies location of repository, data format, and other information for the feed • A single script is tailored to process new data granules for publishing

  6. The Datacasting Client • Uses an email reader type interface • Java based tool designed to work on most platforms • Subscribes to feeds • Filters available data files and downloads only what the user needs • Stores and manages files for later use • Previews data for interactive selection • Visualizes data after download

  7. Rich Metadata • Filtering is a function of the metadata • Some metadata are part of the core Datacasting XML specification, e.g. • Location or Extent • Acquisition or Start time • Other metadata can be defined by the data provider and included in the XML feed, for GHRSST this might be: • % of pixels with a given confidence value • Min, mean & max SST value • Min, mean & max wind speed, solar irradiance, etc • Get imaginative - add event information, such as hurricanes, algae blooms, upwelling, etc.

  8. Become a Datacaster • Definition of initial Datacasting feed specification is complete. • Datacasting server is deployed on the GHRSST GDAC servers with AVHRR and Modis data streams. • Alpha release of the Datacasting client. • Currently the server and client are not for general release. Contact Andrew.Bingham@jpl.nasa.gov to receive copies and begin testing and experimenting. • Plan to advertise all available feeds on the Datacasting web site.

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