Welcome to SESDA

Welcome to the Space and Earth Science Data Analysis (SESDA III) home page. SESDA III is the premier space and Earth science contract at NASA’s Goddard Space Flight Center, held by ADNET Systems, Inc. ADNET, Wyle and Telophase form TEAM ADNET.

Approximately 300 scientists and engineers provide vital support to NASA under the SESDA III contract. Watch this site for exciting SESDA III news, events and job opportunities.

Read more about SESDA and ADNET Systems

GES DISC/USGS Collaboration Leads to More Effective Hydrological Data Analysis

April 17, 2014

GES DISC/USGS Collaboration Leads to More Effective Hydrological Data Analysis
The NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) is home to North American Land Data Assimilation System (NLDAS) as well as Global Land Data Assimilation System (GLDAS) hydrological data. These data can be downloaded for analysis using the Giovanni visualization tool developed and maintained in part by SESDA team members at GES DISC. These data sets, which include variables such as rain rate, soil moisture, surface runoff, snowfall rate, and total evapotranspiration, are particularly useful for regional hydrological studies, and can be used to analyze the similarities and differences between observations and model data.

The usefulness of NLDAS and GLDAS data has been enhanced by a recent collaboration between the GES DISC and the United States Geological Survey (USGS). The collaboration makes NLDAS and GLDAS areal statistics data available for download via the USGS Geo Data Portal (GDP). Users can access and acquire the data from GDP for specific geographical areas, such as states or countries, or they can input their own area of interest as a “shapefile” and acquire the data for just that specific area. This enhancement makes the data more compatible with Geographical Information Systems (GIS) and more easily incorporated into GIS analyses. More importantly, the ability to use irregularly-shaped boundaries for analysis through the GDP may allow a more accurate representation of these data.

As a demonstration of the difference between a simple analysis of NLDAS data performed using Giovanni and with the GDP, the dramatic impact of Hurricane Irene in 2011 on the state of Vermont was selected. Comparison of two time-series plots (below) shows subtle differences due to the large rectangular area used for the Giovanni plot (right graph) and the ability to restrict the area to just the state of Vermont in the GDP plot (left graph). The graph generated by the GDP data provides a better depiction of Irene’s surface runoff peak within the state of Vermont than the area-wide graph generated using Giovanni.

For more information about this collaboration, check out the GES DISC webpage:

SESDA 3 Contributes to Release of New AIRS CO2 Products

March 13, 2014

Global Average CO2
SESDA 3 scientists and engineers working at the Goddard Earth Sciences Data and Information Services Center contributed to the release of Atmospheric Infrared Sounder (AIRS) Version 5 Infra-Red only (IR-Only) Level 2 and Level 3 CO2 products. These data have taken on special significance after the failed launch of the Orbiting Carbon Observatory in 2009 and while preparations for the launch of a replacement satellite are underway. The AIRS CO2 post-processing retrieval algorithm now uses AIRS Level 2 Version 5 products as input. Because of an increase in noise for channel 5 of the Advanced Microwave Sounding Unit (AMSU), the yield of Level 2 data from the AIRS+AMSU algorithm declined. Therefore, production of CO2 data derived from the AIRS+AMSU algorithm was discontinued after February 29, 2012 (DOY 60).
Processing based on the new IR-Only algorithm commenced with data from January 2010. The overlap in the two product types (AIRS+AMSU and IR-Only) will facilitate comparison between the two retrieval scenarios. The AIRS Version 5 Release Tropospheric CO2 Products document (large PDF file, 13.7 MB) indicates that the IR-Only and AIRS+AMSU derived CO2 products have similar accuracy and yield over the two-year period from 2010-2011, when AMSU channel 5 was still useful. AIRS CO2 products will continue to be produced using the Version 5 IR-Only algorithm until the Version 6 CO2 product is produced.
You can read further about this here.

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