 Well it's using some satellite data but it's mainly using remote sensing techniques but on the ground like ground penetrating radar for example or ground based magnetic surveys. Now the same types of studies can be done from space but we do them on the ground on very small areas and in a very explicitly defined area where it's more or less like mowing the lawn. You put down your corner points of your grid and these are areas where you want to understand what's beneath the surface to see if those areas would be of interest to be excavated subsequently.