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:

hydra@ssec.wisc.edu