摘要
AutoCAD系统为现场编制的开挖边坡地质编录资料的展示交流提供了一种便利平台,根据其3D空间的VLISP变换函数,进行二次开发可实现各种投影图式的相互转化。获得了用矢量解法构造相关变换的矩阵形式,指出其为非满秩的平行投影变换,给出了相应的LISP测试代码,表明该变换矩阵形式简明、易于编程开发。通过一水电工程开挖边坡的编录图元变换实例,展示了其立面图向3D立体表面转化的结果。对所编代码在测绘数据叠加、共面边界找平等方面的拓展应用进行了讨论。
Auto CAD system provides a convenient platform for showing the geological record data of slope excavation. Accord- ing to its VLISP function of 3D space geometry, the transformation among charts in various projections can be realized by second- ary development. The matrix form for the transformation, a parallel projection with non - full rank, is constructed with vector method. The corresponding LISP test codes was developed, which show that the transformation form of matrix is of concise, easy to programming as well. By using a case study on pixel transform example of a slope excavation in a hydropower project, the transformation from elevation drawing to the 3D surface are realized. Finally the auxiliary application of the compiled code in data stacking of engineering survey and coplanar boundary leveling of 3D boundaries are discussed.
出处
《人民长江》
北大核心
2013年第4期39-43,共5页
Yangtze River
基金
国家自然科学基金项目(50539050
41130745)
关键词
几何变换
VLISP
开挖面
岩体结构
geometric transformation
VLISP
excavated surface
rock mass structure
