International Collaboration between DB stations for EOS Data Networking Steve Dutcher, Paolo...
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Transcript of International Collaboration between DB stations for EOS Data Networking Steve Dutcher, Paolo...
International Collaboration between DB stations
for EOS Data Networking
Steve Dutcher, Paolo Antonelli, Gieuseppe Meoli, Tom Rink,
Liam Gumley, Paul Menzel, Tom Whittaker
Benevento, Italy
Oct. 3, 2005
International Collaboration between DB stations
for EOS Data Networking
In this talk I will be discussing software
packages that can be used for sharing of EOS
Data between DB stations and software for
visualizing this data.
I will also be giving a live demo of this software
with some remote data sets.
Outline
● OPeNDAP (software for serving up data to
users) ● Hydra (client software for visualizing
instrument data)● S-HIS example● MODIS/AIRS example
OPeNDAP
● OPeNDAP: Open-source Project for a
Network Data Access Protocol.
● Main advantage: Allows user to access
remote data sets without downloading the
entire file. For instance, a user could open a
MODIS 1km hdf file and just grab one band
rather than the entire file.
OPeNDAP
● Supported file formats:– both HDF and NetCDF
● Client software:– specialized GUI software package for working
with data like Hydra or IDV– there is also a Matlab toolbox for OPeNDAP so
that you can manipulate the data to your liking
OPeNDAP
● Another nice feature of OPeNDAP is that
your data files don't have to be formatted in a
specific way, any NetCDF of HDF file can be
served to the users. ● OPeNDAP runs using http protocol and users
can go view a webpage of available data.
Should they find a data set of interest they
just copy that link into their application.
OPeNDAP
● For more information on OPeNDAP, please
visit:
http://www.opendap.org/
Hydra
Hydra
● Hydra is the Hyperspectral-viewer for
Development of Research Applications
● Hydra was originally developed as a tool for
teaching but many people now use it as a
quick way for browsing through
MODIS/AIRS/GOES and other instrument
data
Hydra
● Open source software so anyone can
download it for free.● Built using Java so it is platform independent.● Uses its own scripting language Jython which
is a combination of Python and Java. Using
a scripting language allows for rapid
development.● Uses VisAD libraries.
Hydra
● Data access:– local data files– remote data from an
OPeNDAP server– remote data from an
OpenADDE server
Hydra
● Here is the list of currently supported
instruments. Others can be added as
needed.
– MODIS/AIRS– GOES/MSG– S-HIS
S-HIS
● S-HIS is an aircraft based intereferometer.
This instrument has been used for the
validation of AIRS and other satellite based
interferometers.
S-HIS
● The next slide shows Hydra flipping through
the different segments of a flight from the
Pacific THORPEX campaign. In the upper
part of the black window you see a single
SHIS brightness temperature. The bottom
part shows just one BT, 1050 wavenumbers
and then it flips through the flight segments.
S-HIS
Pacific
THORPEX:
03 Mar 2003
S-HIS
● The next slide shows using Hydra to validate
temperature retrievals using a Radiosonde
for comparison.
Temperature Sounding Validation
Hydra with AIRS data
● This image shows a single
radiance in the top window.
The green line shows which
wavenumber has been
selected for the bottom
window image. Users can
choose to view any radiance
from the image.
Hydra with AIRS data
● One nice feature of Hydra is the ability to do
linear combinations. The image below shows
subtracting wavenumber 903.6 from 1403.5
Hydra with AIRS data
● You can also create scatter plots from two
different images you have from doing a linear
combination. And then you can select
regions from either of your images or the
scatter plot to see where the contributing
points come from.
●
In the top left window we have circled a
section and the contributing points show up
on the scatter plot
Hydra
● For more information on Hydra please visit
this site:
http://www.ssec.wisc.edu/hydra
● You should be able to download Hydra here
and start using it, you must have Java3D
installed first
Conclusion
● Both packages being used here, OPeNDAP
and Hydra have been very useful to us and
we hope that other DB stations consider
running OpeNDAP servers as well. If you
want your station added to the list of sites in
Hydra serving their data please email: