提取等高线程序，map.c为源程序，map.exe为测试程序，.txt是数据文件-contour extraction procedures for the source map.c, map.exe to test procedures . txt file data

等高线提取、显示，以及光滑的程序。希望能够对大家有所帮助。-Extraction of contour lines to show, as well as the smooth process. We hope to be able to help.