这五个文件包含五个基本函数，例如，检验点是否在一个多边形内，计算两个时间字符串代表的时间差，显示一个vector的内容等。-/* This method is to check weather a point is inside a polygon outside it*/

The purpose of this lab exercise is to introduce the student to geometric correction of digital imagery (see Figure A- 6, in appendix). The lab exercise involves the collection of two sets of reference points from the following sources: (1) GPS