D - F
[Source: NASA Earth System Science Pathfinder (ESSP) Program homepage, Earth System Science Pathfinder (ESSP) Program, http://science.nasa.gov/about-us/smd-programs/earth-system-science-pathfinder/ ] (The) NASA Earth Venture (EV) class of missions: a series of uncoupled, relatively low-to-moderate cost, small to medium-sized, competitively selected, full orbital missions (EVF), instruments for orbital missions of opportunity (EVi) and sub-orbital projects (EVS), legacy ESSP Projects: Projects selected under prior Announcements of Opportunity that are currently in operations, and non-competitive, directed Projects: projects that are designed to meet unique needs such as the replacement of a mission that did not fulfill its intended mission requirements.
EARTH VENTURE