... freeforacademicpurposes.Theextensionusesbothvector and raster data. The analysis tool forfinalpurposeisusingdata in rasterformat.3.1.1.Creatingthemap of originsAccording to the data interpolation in AccessMod,map of originscontaininformation of ... newquantitativeandcoremethod.Accessibilityisthebroadconceptandithasa wide range of applications, in particular:urban studies (housing planning, socialfacilities planning ... VNUJournal of Science,EarthSciences23(2007)265‐272265 An assessment of healthcaresystemaccessibility of localcommunities in YenChauDistrict,SonLaProvinceTranAnhTuan1,*,TranVanTuan1,LeTuan An 2,HoangThanhTung11College of Science,VNU2CentreforEnvironmentalStudies,Alliance of Vietnam CooperativeReceived10October2007;received in revisedform28November2007Abstract.SonLaHydroelectricProjecthasdesignedtheplantwiththecapacity of 2400MW.Itwillprovideelectricityfornotonlythenorthwestregionbutalsofortheotherregions of Vietnam. Theprojectwasapprovedbythe Vietnam NationalAssemblyonDecember16th,2002, in detail:SonLaHydroelectric...