Exploration - Visualization
Exploration - Topography & Land Cover Data
NASA Zulu Server (color balanced LandSAT images)
Exploration - Weather & Water
PRISM Climate Group (global precipitation & temperature)
Tropical Rainfall Measuring Mission (TRMM global precipitation)
NOAA Advanced Hydrologic Prediction Service (river gauges)
Observatories
Scientific Societies
Science & Education Blogs
Universities
Links