A thermal image revealing features on/under a grassed playing field.  Visualisation is through differential 'drying', as the image was produced following a shower of rain a few hours earlier. Differential evapotranspiration is involved along with other factors. (*<a rel="nofollow" class="external autonumber" href="http://web.archive.org/web/20200922151826/http://www.armadale.org.uk/aerialthermography.htm">[1]</a>/)
West Lothian Archaeological Trust: ARCHIVE - <a rel="nofollow" class="external free" href="https://web.archive.org/web/20181124082056/http://www.armadale.org.uk/wlat.htm">https://web.archive.org/web/20181124082056/http://www.armadale.org.uk/wlat.htm</a> (John Wells)
<span class="int-own-work" lang="en">Own work</span>