default http://datalib.library.ualberta.ca/~cgcp/ilinks.html
poly http://datalib.library.ualberta.ca/~cgcp/igbp.html 121,235 81,256 64,285 64,302 71,322 92,344 113,354 140,360 161,359 195,349 216,334 229,312 232,298 230,286 221,266 208,253 198,245 181,238 165,233 133,233 122,235