Parallel method for large-area drainage basin extraction
A large area and watershed technology, applied in the parallel field of watershed extraction, can solve problems such as decision-making mistakes, economic losses of the country and the people, and increase the cost of computing, so as to reduce the impact of computing efficiency, expand the breadth of applications, and ensure the effect of load balance.
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[0046] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
[0047] In the present invention, the data division, fusion strategy and parallel I / O mechanism under the data parallel mode:
[0048] 1. Data partition strategy
[0049] (1) division method
[0050] Row Band Communication Partition (RBCP): When the DEM data is calculated, it is in the form of a matrix with m rows and n columns, which can be organized in a two-dimensional array. The storage form of DEM data based on two-dimensional arrays in the physical layer is row-by-row (such as figure 1 shown) and load balancing is an important factor for each computing node to achieve maximum computing efficiency in the parallel computing process. Considering two aspects, the present invention uses row-band redundancy partitioning when dividing DEM data. The line-band communication domain division refers to a strip-like division method that incl...
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