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GTOS Observing Networks The Global Terrestrial Observing System (GTOS) programme structure is composed of panels, regional projects and technical programmes. Implementation of the observing programs is accomplished using satellite missions, technical programs, and existing and expanded terrestrial networks. Users can access GTOS data and information through the GTOS MATRIX below or in the "more about GTOS" section. The GTOS MATRIX is based on the GHOST hierarchical strategy. The hierarchy divides into five tiers, each with unique characteristics and roles, although existing facilities often straddle more than one tier. The concept is applicable to the three main areas which GHOST is concerned with - the land surface, freshwater ecosystems and ice surfaces - each with its own hierarchy, but all share tier five.
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