Community Gridpoint Statistical Interpolation System

Welcome to the users page for the Community Gridpoint Statistical Interpolation (GSI) system. The GSI system is a variational data assimilation system. It is designed to be a flexible, state-of-art system that is efficient on available parallel computing platforms. The GSI system is in the public domain and is freely available for community use.

The core of this community system is primarily developed at National Oceanic and Atmospheric Administration/National Centers for Environmental Prediction/ Environmental Modeling Center (NOAA/NCEP/EMC) and National Aeronautics and Space Administration/Global Modeling and Assimilation Office (NASA/GMAO). Lately, NOAA/Earth System Research Laboratory/Global Systems Division (NOAA/ESRL/GSD) and National Center for Atmospheric Research/Earth & Sun Systems Laboratory/Mesoscale and Microscale Meteorology Division (NCAR/ESSL/MMM) are also contributing to the GSI development.

The Developmental Testbed Center (DTC) is currently maintaining and supporting a community GSI system with various capabilities developed by all the GSI developers, including the research community. To achieve this goal, the GSI system has been ported to and tested on multiple platforms by the DTC. The DTC also prepared the documents to help researchers to use GSI and provides support to the research community on GSI related issues by working closely with the GSI developers. The testing and support of this GSI system at the DTC currently focus on limited area numerical weather prediction (NWP) applications coupled with the Weather Research and Forecasting (WRF) Model , but this sytem may be applied to global forecast applications as well as other modelling systems.