Changes between Version 11 and Version 12 of WikiStart


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Timestamp:
Aug 26, 2010, 9:27:45 AM (10 years ago)
Author:
lnerger
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  • WikiStart

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    8 PDAF enables data assimilation.
     8The Parallel Data Assimilation Framework - PDAF - is a software framework that simplifies the implementation of data assimilation systems using existing numerical models. Reducing the work required for the implementation will enable users to obtain a data assimilation system with less work such that they can focus on applying data assimilation, rather than implementing it. The defined interface of PDAF allows to continue the development of the assimilation methods and the model independently. New developments on the algorithmic side can be readily made available through the interface such that can be tested immediately with existing implementations.
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    10 Data assimilation is used to combine observations of some system, like the ocean or the atmosphere, with a numerical model simulating this system. As both, the observations and the numerical model are not exact, the combined information of both sources can provide a better estimate of the true state of the system than each of the information sources alone.
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    12 Performing data assimilation with advanced algorithms and large-scale models is computationally extremely demanding. However, with ensemble-based data assimilation algorithms supercomputers can be used very efficiently. PDAF simplifies the implementation of data assimilation systems for supercomputers using existing model code by the following:
     10PDAF is optimized for the application with large-scale models that usually run on big parallel computers. However, also smaller models and even toy models can be used.  PDAF simplifies the implementation of data assimilation systems using existing model code by the following:
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    1412 1. PDAF provides fully implemented, parallelized, and optimized ensemble-based algorithms for data assimilation. Currently, these are ensemble-based Kalman filters like the LSEIK, LETKF, and EnKF methods.
     
    1816 1. PDAF does not require that your model can be called as a subroutine. Rather PDAF is added to the model and the formed data assimilation system can be executed pretty much like the model-program would without data assimilation.
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    20 This Wiki contains a growing documentation for PDAF. We will also add a possibility to register and download PDAF.
     18PDAF is an open-source project. Thus, users are welcome to contribute to the further enhancement of PDAF, e.g. by contributing further assimilation methods or interface routines for different numerical models.
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     20This Wiki contains a growing documentation for PDAF. We will also add a possibility to register and download PDAF.
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    2222Documentation[[BR]]