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:

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 from

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: ● 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