an update on cola’s software development jennifer m. adams and brian doty
TRANSCRIPT
An Update on COLA’s Software Development
Jennifer M. Adams and Brian Doty
Software Components
GrADSAn interactive tool for geoscience data analysis and
visualization
GrADS Data Server (GDS)An OPeNDAP server that provides remote data access,
subsetting, and server-side analysis
Greta A web-based searchable catalogue
for all of IGES’s data holdings
GrADS Release HighlightsMajor changes to the core of GrADS:• Added 5th dimension for ensembles• Internal data handling in double precision
New GDS Release: • Ensemble data via OPeNDAP• GDS can serve all GrADS-readable data set• GrADS is a client for all GDS data sets
New Analysis capabilities:• Slice diagonally through ensembles
GrADS Release Highlights (cont’d)
Added interfaces for reading new data formats:• GRIB 2• HDF 5• Compressed NetCDF-4• Shapefile
New options for creating output in various formats:• NetCDF (classic and compressed)• GeoTIFF• KML
Other Noteworthy Accomplishments
GrADS team received funding from NASA’s Applied Information Systems
Research Program (AISRP)
COLA assumed management of GrADS users forum
THORPEX Interactive Grand Global Ensemble (TIGGE) forecast data are behind GDS at NCAR
GrADS team partnered with NOAA Climate Prediction Center
to develop products for GIS applications
Diagonal Slicing Through a Set of Lag Ensembles
GrADS Display of Cloud Fraction (AURA L2G in HDF5 format)
GrADS Plot of GFS Precipitation Data Displayed in Google Earth
GrADS Integrates GIS and Gridded Data FormatsPalmer Drought Severity Index in U.S. Climate Zones
with 500mb Height Anomalies, July 1993
GrADS Integrates Gridded and GIS Data FormatsGridded Radar Observations during Snowmageddon, 12Z 6 Feb 2010
with Roads and State and County Boundaries
WSR-88D Base Reflectivity
[dBZ]
In Support of High Resolution Climate Modeling
Data volume reduction using NetCDF-4 compression: 6.4 : 1 (84%) soil moisture 3.7 : 1 (73%) precipitation 1.5 : 1 (33%) u-wind Improved I/O performance: Calculate a time series of zonal means 50 Mb grid, 12 time steps 26 seconds (netCDF-4) vs. 11.5 minutes (binary)
Handling of Very Large GRIB Files 47-year IFS AMIP and Time Slice Runs
Visualization Image generation shortcuts, animation techniques