›› 2013, Vol. 15 ›› Issue (5): 655-661.doi: 10.3724/SP.J.1047.2013.00655

• ARTICLES • Previous Articles     Next Articles

Appllication Analysis of the Improved HASM-AD in the Spatial Variable Simulation

ZHAO Mingwei1,2, YUE Tianxiang1, ZHAO Na1,2   

  1. 1. State Key Laboratory of Resources and Environment Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-04-02 Revised:2013-04-18 Online:2013-09-29 Published:2013-09-29

Abstract:

As a new surface modeling method, the HASM model can improve the spatial surface simulation significantly. However, the slow solution speed limited the wider application, at the same time, there is little analysis about how to select proper HASM algorithm for practical application because so many HASM algorithms were put forward in the past years. In order to improve the HASM model on speed, in this paper we improved the HASM-AD algorithms. Firstly, index information of sample points were added into the solution process, which could improve the solution speed greatly. At the same time, the computation of the first fundamental coefficients, the second fundamental coefficients and the Christoffel symbols of the second kind were moved to the calculation process of the independent units, which could decrease the memory demand. Mathematical test show that the improved HASM-AD indeed andvance the speed and meanwhile save the EMS memory. At last, in order to test the accuracy and speed advantage of the improved HASM-AD, the improved HASM-AD was applied into the rainfall distribution simulation of the China. The simulation result shows that the improved HASM-AD not only improves the simulation accuracy, but also improves the speed signicantly. For example, the HASM-PCG, another HASM algorithm used widely for its highe solution speed and accuracy, takes 1920 second, while the improved HASM-AD only takes 4 second and meanwhile abtain a better simulation result. So the HASM-AD indeed advance the solution speed greatly and it is proper to applied this algorithm into the large scale simulation of spatial variable.

Key words: solution speed, independent computation unit, HASM-AD, spatial variable