ESRI SHAPE文件读/写源代码。SHAPE是GIS中的重要文件格式，本代码对于研究SHAPE文件格式，实现独立代码读/写SHAPE而言，将非常轻松。建议首先阅读SHAPE文件格式白皮书。-ESRI SHAPE document read / write source code. SHAPE is a major GIS file format, the code for research SHAPE file format, achieve independent code reading

Drale编写的升力面模型，机翼表面被离散为涡格。与升力线模型相比，升力面模型更多的考虑了机翼的几何形状。-Lifting surface model Drale write the wing surface the discrete vortex lattice. Compared with the lifting line model, the lifting surface model consideration of the geometric shape of the wing.