Natural　disaster　observation　technology　has　significant　progress　with　the　development　of　advanced　satellite　remote　sensing　(RS),　Unmanned　Aerial　Vehicles　(UAVs),　and　Internet　of　Things　(IOT)　technologies.　In　this　paper,　we　discuss　the　architecture　of　an　integrated　natural　disaster　observation　system　using　RS,　UAVs,　and　IOT　technologies.　We　concern　three　aspects:　heterogeneous　communication,　air-ground　cooperation　mechanism,　and　data　visualization　using　Geographic　Information　System　(GIS).　A　Real-world　system　has　been　developed,　and　a　series　of　simulation　and　experiments　have　been　performed,　and　the　proposed　architecture　provides　better　system　scalability　in　complex　environment.　©　2022　IEEE.