【摘要】 基于GRID和TIN的优缺点,提出了GRID和TIN的混合建模模型,详细讨论了建立混合模型的步骤。最后利用OpenGL技术,对地形模拟区域进行了实验测试,并以时间消耗和内存开销为评价指标对GRID,TIN和混合建模方法进行了比较。结果表明,在分辨率一定的情况下,混合建模的效率要高于TIN方法,小于GRID方法,在内存开销方面,TIN方法开销最大,混合建模次之,GRID建模方法最小,综合两方面因素可以看出,混合建模方法要优于TIN和GRID方法。混合建模模型既保持了矩形格网存储量小,易于管理、使用的特点,又继承了三角网能较好的顾及地貌特征的优点,起到了扬长避短的作用。更多还原

【Abstract】 Based on the advantages and disadvantages of GRID and TIN,a hybrid modeling model of GRID and TIN is proposed,and the steps to establish a hybrid model are discussed in detail. Finally,using OpenGL technology,the terrain simulation area is tested experimentally,and GRID,TIN and hybrid modeling methods are compared with time consumption and memory overhead as evaluation indicators. The results show that the mixed model has higher efficiency than the TIN method when the resolution is fixed,and less than the GRID method. In terms of memory overhead,the TIN method has the largest overhead,the hybrid model takes the second place,and the GRID modelling method has the least. Aspect factors can be seen that the hybrid modeling approach is superior to the TIN and GRID methods. The hybrid modeling model not only maintains the characteristics of small grid storage,easy management,and use,but also inherits the advantages of the triangulation network that can take into account the features of the terrain,and plays a role in avoiding weaknesses.更多还原