> Of the six camps that we used in our feasibility study, five had blank tiles at their location at zoom level 18 in Baidu, They "correlated" that out of 6 "ca

> Of the six camps that we used in our feasibility study, five had blank tiles at their location at zoom level 18 in Baidu, They "correlated" that out of 6 "camps" 5 of them had missing tiles, which gives you the chance of a blanked out tile give a "camp", but not the chance of a "camp" given blanked out tile.