In the model , the overall atmospheric state at any given instant is represented by the values of the variables at systematically arranged points set up within a three - dimensional grid 模式内的大气三维空间被分割成为排列整齐的网格点阵，而各网格点上气象变数的数值则代表了当时大气的整体状态。
Only center and neighboring points are used in present scheme , so the method of forward elimination and backward substitution can be directly used to solve linear simultaneous equations obtained from the scheme 该方法仅涉及中心点及相邻网格点，具有四阶精度，并且由所提格式得到的线性方程组是三对角线型的，可以直接采用追赶法进行求解。
As tropical cyclones can cover distances of hundreds of kilometres , the area covered by the open coast model has to be large and the grids used in the model correspondingly coarse 由于热带气旋的影响范围可以广达数百公里，开阔海岸风暴潮模式的覆盖范围亦要相应扩大以致模式内网格点间的距离大了，一些细微的海岸线变化如港湾和河口就不能在这网格上显示出来。
As tropical cyclones can cover distances of hundreds of kilometres , the area covered by the open coast model has to be large and the grids used in the model correspondingly coarse 由于热带气旋的影响范围可以广达数百公里，开阔海岸风暴潮模式的覆盖范围亦要相应扩大以致模式内网格点间的距离大了，一些细微的海岸线变化如港湾和河口就不能在这网格上显示出来。
The other is based on contour line . the way is that first editing the contour line , then saving these heights , finally depending on linear calculating middle value , thus getting the height of every mesh point , and the 3d terrain model 另一种方法是基于等高线的方法，该方法是通过对等高线进行编辑，保存相应点的高程，再根据线性插值，得到各个网格点的高程，从而生成对应的地形模型。
The bay model complements the first by using a very fine grid to resolve those geographic features such as bays and inlets at which storm surge observations are absent and where storm surge information is required as design parameters for coastal structures such as embankments 而港湾风暴潮模式的覆盖范围较小，这模式利用一套非常密集的网格点来计算出例如港湾和河口等地理位置的风暴潮资料以补开阔海岸模式的不足。
Surface reconstruction method using 4 - point interpolatory subdivision surface is produced according to request of surface fea in this thesis . 3 . algorithm design of surface reconstruction based on fea algorithm was designed according to surface reconstruction method in the thesis ( 3 )基于有限元分析的曲面重构算法设计根据论文提出的离散数据点的曲面重构方法，设计了采用四点插值细分曲面网格点的曲面重构算法。
Thus this approach is dominant over conventional ones . in chapter 5 , accelerating techniques for the extraction of iso - surface is discussed . a modified mc algorithm is presented with cache mechanism , which can greatly reduce the redundant calculation and visit on grid points 我们提出了用cache方法来进行加速，这是’一种效率较高的等值面抽取mc （ marchingcubes ）方法，大大减少了冗余计算和对于数据网格点的冗余访问。
As tropical cyclones can cover distances of hundreds of kilometres , the area covered by the open coast model has to be large and the grids used in the model correspondingly coarse . the disadvantage is that small variations in coastlines such as bays and inlets cannot be resolved 由于热带气旋的影响范围可以广达数百公里，开阔海岸风暴潮模式的覆盖范围亦要相应扩大以致模式内网格点间的距离大了，一些细微的海岸线变化如港湾和河口就不能在这网格上显示出来。
We also take into account the relation of wind direction and hilly aspect to calculate the wind accurate distribution in chongqing for different wind direction . the networkware ' s hilly aspect date is calculated with the chongqing dem ( 100m 100m ) . it can provide base datum for chongqing agriculture region compartment 由重庆市1 ： 25万dem计算了100m 100m网格点的坡向，由此计算了不同风向下的精细风速分布图，为重庆地区农业气候区划提供可参考的基础资料。
