将经纬度格式的txt文件转为google earth能够显示的kml文件。(To convert the TXT file with latitude and longitude to the KML file that Google earth can show)

kml与txt互相转化；注意：txt转kml文件时，txt文件数据格式如下： 多条线、区之间用空行间隔(KML and TXT transform each other; note: when TXT is transferred to KML file, the data format of TXT file is as follows: multiple lines, between empty intervals.)