text: Systematic surveys can be used to in searching for mineral deposits or locating lost objects. Such surveys are divided into:
  *Aeromagnetic survey
  *Borehole
  *Ground
  *Marine
  Aeromag datasets for Australia can be downloaded from the [https://web.archive.org/web/20110601172707/http://www.geoscience.gov.au/bin/mapserv36?map=%2Fpublic%2Fhttp%2Fwww%2Fgeoportal%2Fgadds%2Fgadds.map&mode=browse GADDS database].
  Data can be divided in point located and image data, the latter of which is in ERMapper format.