satellite mapping aids darfur easing help workers trying house feed clothe gazillion homeless refugees sudanese region darfur fetch serve hand advanced mapping technology european pool companies university groups known answer do work provide accurate date represent aim overcome huge logistic challenges getting supplies needed respond using satellite imagery produce accurate maps used field rapidly respond produced elaborate maps example road networks rivers villages maps utilitarian oecumenical contrive purposes said einar bjorgo unosat un satellite mapping organisation part respond syndicate group uses satellites nasa european space agency disaster supervise constellation satellite datum transmitted dry land stations information makes way respond organisations specialise interpreting data point convert data images interpreter convert crisis damage situation maps tell stefan voigt works remote perception department one organisations german aerospace centre kind detail analysis usually takes couple months react gets done hours users usually much familiar read satellite imagery reading planet maps task transfer datum information people read understand easily efficiently said mr voigt answer supplies represent aid groups via web compact record best map one hold hands especially remote areas net connections laptops scarce map exploit text file explains victor herbert hansen respond belgian partner keyobs need use need write correct give feedback ask paper write print maps laminate maps encapsulate maps needed take shower map completely protected humanitarian groups darfur making good use respond maps come especially handy sudan rainy season normally dry river bottom wadis became flooded wadis small amount flooding generally condition profundity greatly close up transport capabilities capacities humanitarian groups ground says stephen candillon react imaging partner sertit respond speedy mental imagery allowed aid groups find ways some wadis allowing print maps roads washed times aid groups say combination satellite technology observation helped keep relief flowing needed clark boyd technology correspondent world bbc world service