Stratosphericplatforms, Geostationary Located at Altitudes Of 17 – 25 Km, Offer The Possibility of Becoming A New Generation Of Infrastructural Elements For Future Earth Observation And Telecommunication Systems. They Can Act As Pseudo- Satellites, But With The Advantage Of Being Much Cheaper And Closer to The Ground And They Can Per- Form Missions That Offer Greater Flexibility. They Could Be Self-Launched, Easily Recovered For Maintenance, Whenevernecessary, and Moved to Cover Different Regions, If Desired. They Allow A More Detailed Land Vision, Due Totheir Relative Closeness to The Earth, At a Much Lower Cost Than Conventional Satellites; Furthermore They Are Geostationary Locatedand Do Not Suffer from Typical Satellite Revisiting Time Limits from 12 H Up to 20 Days. These Platforms Could Cover a Wide Range of Applications: Real-Time Monitoring of Seismic-Risks or Volcanicareas, Early Forest Fire Detection, Border Securitysurveillance, Pipeline, And Power-Linesurveys; Telecommunication Servicessuch As Cellular-Telephone Networks,Photogram- Metry, Hydrographicmonitoring System, Agriculture Monitoring, Etc.