landmarks.txt

avoid 16:
{30.6357604, 114.2102454},
 {30.6206240, 114.4190201},
 {30.6201832, 114.2132492},
 {30.6551874, 114.2988177},
 {30.5827114, 114.4114266},
 {30.5211646, 114.2465313},
 {30.5005932, 114.2935017},
 {30.5751089, 114.2354420},
 {30.6550336, 114.2822843},
 {30.5017398, 114.4292775},
 {30.5617746, 114.4432224},
 {30.6385844, 114.3949592},
 {30.6433098, 114.2586681},
 {30.5226665, 114.4503951},
 {30.6474337, 114.3370946},
 {30.6018754, 114.4224124},
 {30.4942223, 114.3210146},
 {30.6049409, 114.4286292},
 {30.5996193, 114.2154722},
 {30.6291274, 114.4206168},
 {30.4979479, 114.3620929},
 {30.5701618, 114.4089203},
 {30.4986034, 114.3283489},
 {30.6567048, 114.3121701},
 {30.4910525, 114.3276655},
 {30.6371074, 114.3733771},
 {30.5027901, 114.3822579},
 {30.5656868, 114.2133197},
 {30.4929671, 114.3842194},
 {30.5059596, 114.4076078},
 {30.5529102, 114.2353832},
 {30.5824735, 114.4119657}