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Data to Action: Increasing the Use and Value of Earth Science Data and InformationFor 20 years, ESIP meetings have brought together the most innovative thinkers and leaders around Earth observation data, thus forming a community dedicated to making Earth observations more discoverable, accessible and useful to researchers, practitioners, policymakers, and the public.

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Friday, July 19 • 11:45am - 1:15pm
New paradigms for alternative data packaging of geolocation information in EO satellite data

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Earth observation (EO) satellite files can encode the geolocation of their
observations in a variety of ways. This often depends on the processing
level of information. Gridded rasters can be described by concise map
projection information while Level 1 and 2 data that are in native satellite
coordinates require more detail. Often these files encode the pixel level
geolocation information as multi dimension variables internal to the file.
In the past there have been example implementations of storing geolocation
in an external file (early NASA MODIS) or sub sampling geolocation
information (early NASA SeaWiFS) that did not work out very well for
various reasons. Storing the geolocation data or map projection references
in each file (granule) has many advantages the most important is playing
"nicely" with tools and services and software, and promoting
interoperability. However, the geolocation data for L1/L2 EO files are
often the storage heaviest individual component as its precision requires at
least float data types (its information cannot be elegantly "packed") so it
is worthwhile to revisit ideas and methodologies for reducing its
footprint. How best could geolocation information be shared across
different variables, different files from the same sensor, or even
different sensors on the same platform. Furthermore, in the age of cloud
and database tiled storage of satellite information how is geo-location (and
other) information best packaged and utilized to improve data access and
processing. In this session we will look at this problem and potential
solution space via a number of presentations, historical lessons learned and
dynamic discussion.

  • Introduction: Ed Armstrong and Alexsander Jelenak
  • Kwo-Sen Kuo: STARE and data packaging
  • Robert Wolf: MODIS Experience with External Geolocation
  • Ed Armstrong; Reducing geolocation storage: a CF success story, and introducting a novel (and complicated) Eumetsat L2 data model 
  • Alexsandar Jelenak: HDF5 and external references
Find and access all slides: https://doi.org/10.6084/m9.figshare.8986325

Session recording here.


Aleksandar Jelenek

The HDF Group
avatar for Ed Armstrong

Ed Armstrong

Science Systems Engineer, NASA JPL/PO.DAAC
avatar for Kwo-Sen Kuo

Kwo-Sen Kuo

UMD/NASA Goddard/Bayesics LLC
Kwo-Sen Kuo is a “disruptive thinker” (commonly known as “boat-rocker” or “troublemaker”) because he likes to question the existing ways of doing things. Although he considers that to be completely rational, it is not always appreciated as so by others. His disruptiveness... Read More →

Friday July 19, 2019 11:45am - 1:15pm PDT
Room 318
  Room 318, Breakout