Enabling the Transition of CPC Products to GIS Format Brian Doty Jennifer Adams Michael Halpert Viviane Silva

Strategy Enhance the GrADS software package to: –Output GIS formats –Improve analysis and data management for multi-ensemble multi-model data sets CPC delivers products via the ArcGIS server

The Grid Analysis and Display System (GrADS) Integrated environment for data access, analysis, and display Automation and batch processing Open source; active open source community Handles many data formats: binary, netCDF, HDF, GRIB1, GRIB2, BUFR Distributed data via GDS and openDAP (GDS: GrADS Data Server)

GIS Data Formats Shapefile –Vector format Enhance the GrADS graphics package to produce vector data compliant with Shapefile standards –Attribute database (metadata) Use metadata already internal to GrADS where possible; provide interface to provide additional metadata GeoTIFF –Raster format Produce analytic grid products with GrADS and output directly to GeoTIFF format

GrADS, Ensembles, Multi-model Biggest design issue: How to handle time Examples follow

Ensemble Forecast Time Series at a fixed location Forecast Time --->

Ensemble Forecast Grid at a fixed location Forecast Time ---> Ensemble Member

Two Ensemble Forecasts at a fixed location Forecast Time ---> Ensemble Member

Ten Ensemble Forecasts at a fixed location Forecast Time ---> Ensemble Member

33 Ensemble Forecasts at a fixed location Forecast Time ---> Ensemble Member

Examples of Ensemble Data Sets NCEP GFS Ensembles (GENS) NCEP Short Range Ensemble Forecasts (SREF) NCEP Climate Forecast System (CFS) ESRL MRF Re-Forecasting Experiment WCRP CMIP3 Multi-Model Data (IPCC AR4) ENSEMBLES THORPEX Interactive Grand Global Ensemble (TIGGE)

Ensemble Data Sets Behind GDS 2.0 Data become more usable and accessible Subsets over all dimensions Server-side analysis File aggregation and format translation Metadata standards:

Ensemble Forecast Time Series at a fixed location Forecast Time --->

Ensemble Forecast Time Series at a fixed location Forecast Time --->

TIGGE Multi-Member Multi-Model Ensemble 500mb Geopotential Height valid August 30, day Lead 3-day Lead 5-day Lead 1-day Lead

TIGGE MME Forecast Error and Ensemble Spread 500mb Geopotential Height valid August 30, day Lead 3-day Lead 5-day Lead 1-day Lead

TIGGE Multi-Member Multi-Model Ensemble 500mb Geopotential Height valid August 30, day Lead 3-day Lead 5-day Lead 1-day Lead

TIGGE MME Forecast Error and Ensemble Spread 500mb Geopotential Height valid August 30, day Lead 3-day Lead 5-day Lead 1-day Lead

The End