Image ProductsWelcome to the image products home page. Operational image products are generated from the Advanced Very High Resolution Radiometer (AVHRR) Global Area Coverage (GAC) data recorded on the NOAA polar orbiting satellites. Some of these products are now available online. NOTE: Online products are not considered "operational" - please read our disclaimer. Global Vegetation Index (GVI) ProductsGVI products consist of the normalized density vegetation index, the fractional vegetation index, and the precipitable water index. The first two products are a measurement of the Earth's 'greenness' and the third product is a measurement of the water vapor amount.
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