▁and ▁phot ometric ▁data ▁products , ▁a ▁ge od etic ▁control ▁network ▁tied ▁to ▁rad ar ▁alt imet ry , ▁and ▁a ▁database ▁of ▁pl ume - search ▁observations . ▁ ▁Over view ▁ ▁E IS ▁comb ines ▁a ▁narrow - angle ▁camera ▁( N AC ) ▁and ▁a ▁wide - angle ▁camera ▁( W AC ) ▁designed ▁to ▁address ▁the ▁reconna issance ▁goals . ▁Both ▁cam eras ▁operate ▁on ▁the ▁visible ▁spectrum ▁( 3 9 0 ▁to ▁ 7 0 0   nm ) ▁and ▁make ▁use ▁of ▁push ▁bro om ▁sc ann ers ▁for ▁obtain ing ▁images ▁with ▁spect ro scop ic ▁sens ors . ▁ ▁The ▁Princi pal ▁investig ator ▁is ▁Elizabeth ▁T urt le . ▁ ▁Object ives ▁ ▁The ▁object ives ▁of ▁the ▁E IS ▁instrument ▁are : ▁▁▁ ▁Character ize ▁the ▁ice ▁shell ▁by ▁determ ining ▁its ▁thick ness ▁and ▁correl ating ▁surface ▁features ▁with ▁sub sur face ▁structures ▁detected ▁by ▁ice ▁pen etr ating ▁rad ar . ▁Con stra in ▁formation ▁processes ▁of ▁surface ▁features ▁and ▁the ▁potential ▁for ▁current ▁activity ▁by ▁character izing ▁end ogen ic ▁structures , ▁surface ▁units , ▁global ▁cross - cut ting ▁relationships , ▁and ▁relationships ▁to ▁Europa ' s ▁sub sur face ▁structure , ▁and ▁by ▁searching ▁for ▁evidence ▁of ▁recent ▁activity , ▁including ▁potential ▁pl umes . ▁Character ize ▁scientific ally ▁comp elling ▁landing ▁sites ▁and ▁ha z ards ▁by ▁determ ining ▁the ▁nature ▁of ▁the ▁surface ▁at ▁scales ▁relevant ▁to ▁a ▁potential ▁Europa ▁Land er . ▁ ▁General