Vegetation Products

The Vegetation Health Product (VHP) consists of gridded weekly global vegetation indices (VCI, TCI and VHI) derived from AVHRR GAC orbital data for the global area between latitude 55°S to 75°N. The projection of VHP is Plate Carree (also called geographic projection or equal latitude-longitude interval grid). The interval of grid is 0.036° (about 4km at equator). Noise is minimized by applying the time series smoothing technique and other correction algorithms. Details on the algorithm can be found at Algorithm Description

Products include:
• Temperature Condition Index
• Vegetation Condition Index
• Vegetative Health Index
• Normalized Difference Vegetation Index
• Brightness Temperature
• TIF Files on FTP Server

The GOES Evapotranspiration and Drought (GET-D) products are derived from the Atmosphere-Land Exchange Inversion model (ALEXI). ALEXI ET is retrieved over clear-sky pixels daily and ALEXI drought product is generated over 1 to 6 month compositing periods each day. The satellite derived ET data products are critical to improving land surface model simulations and in order to improve numerical weather/climate forecasts; more accurate and complete ET and drought data products are critical for global and US agricultural management forecasts.

Product:
GOES Evapotranspiration and Drought (GET-D)

The third generation polar Global Vegetation Index (GVI) products are used for monitoring the density and vigor of green vegetation. Useful applications of GVI products include classifying land cover, estimating crop acreage, and detecting plant stress. The GVI operational products are weekly composites, and have a resolution of about 16 km. A comprehensive description of GVI products may be found at the national Climatic Data Center's NOAA GVI Guide.

Products include:
• Normalized Difference Vegetation Index (NDVI): a calculation of the differences between AVHRR channels 1 and 2
•  Fractional Vegetation: NDVI displayed as a fraction
• Precipitable Water Index: a measurement of how much water vapor is in the atmosphere

The Global Vegetation Processing System (GVPS) is designed to generate global vegetation health and vegetation fraction products based on weekly GVI data. The GVPS delivers an integrated software application system that is capable of full automation in operation and provides customized user control through the application GUI towards the generation of real time weekly land surface NDVI, Green Vegetation Fraction (GVF), and vegetation health products. The primary product of this system is GVF. The secondary products are drought mornitoring indices including weekly Vegetation Condition Index (VCI), Temperature Condition Index (TCI), and Vegetation-Temperature Index (VTI) or the so-called Vegetation Health (VH) Index. Other intermediate products include Smoothed NDVI SMN) and Smoothed Temperature (SMT).

Products include:
• Green Vegetation Fraction
• Vegetation Health Index

The Green Vegetation Fraction (GVF) system was developed to generate GVF as a NOAA-Unique Product (NUP) from data from the Visible Infrared Imager Radiometer Suite (VIIRS) sensor onboard Suomi National Polar-orbiting Partnership (SNPP) satellite, for applications in numerical weather and seasonal climate prediction models at the National Centers for Environmental Prediction (NCEP). The retrieval algorithm uses VIIRS red (I1), near-infrared (I2) and blue (M3) bands centered at 0.640 μm, 0.865 µm and 0.490 µm respectively, to calculate the Enhanced Vegetation Index (EVI) and derive GVF from EVI. GVF will be produced as a daily rolling weekly composite at 4-km resolution (global scale) and 1-km resolution (regional scale).

The Metop Global Vegetation Index (MGVI) product is used for monitoring the density and vigor of green vegetation. Useful applications of GVI products include classifying land cover, estimating crop acreage, and detecting plant stress. The weekly composite Metop Global Vegetation Index (MGVI) is derived from MetOp AVHRR global 16 km FRAC data. When the daily map is created, the most nadir pixel is selected. The weekly composite product is created from daily maps of 7 days on pixel basis by selecting the data of the day with Maximum NDVI.

Product:
• Normalized Difference Vegetation Index (NDVI)

The VIIRS Vegetation Health Product (VVHP) is gridded weekly global vegetation indices (Vegetation Condition Index (VCI), Temperature Condition Index (TCI) and Vegetation Health Index (VHI).) derived from VIIRS Scientific Data Records (SDR) for the global area between latitude 55°S to 75°N. The projection of VHP product is Plate Carree projection (geographic projection, a grid with equal latitude-longitude interval). The interval of grid is 0.036° (about 4km at equator). Noise is minimized by applying the time series smoothing technique and other correction algorithms. Details on the algorithm can be found at Algorithm Description.

Products include:
• Temperature Condition Index
• Vegetation Condition Index
• Vegetative Health Index
• TIF Files on FTP Server