"The risk factors include the dimensions of the structure, its location and its location relative to other buildings around it, " explainsMatthew Waldrum from Omega Red Group, who assesses the risk of lightning hitting buildings.
Many firms now know that it offers more flexibility than proprietary programs, the licences for which often include restrictions on how they can be used, explainsMatthew Aslett, of the 451 Group, a market-research firm.
"It would take three or four hours to clear a ridge line so soldiers could advance, " explains Lieutenant Colonel Matthew England of the Army's training and doctrine command, which develops equipment for soldiers.