Greenness Maps

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from Wildland Fire Assessment System website http://www.fs.fed.us/land/wfas/welcome.htm Live Fuel Moisture - Greenness Maps Vegetation greenness maps are derived weekly from Normalized Difference Vegetation Index (NDVI) date observed by satellites and provided by the EROS Data Center, US Geological Survey. These maps have a 1 kilometer (.6 mile) spatial resolution. Maps with historical references (RG and DA) are based on the years 1989 through 1995. The derived maps include: Visual Greenness Maps - portray vegetation greenness compared to a very green reference such as an alfalfa field or a golf course. The resulting image is similar to what you would expect to see from the air. Normally dry areas will never show as green as normally wetter areas. Relative Greenness Maps - portray how green the vegetation is compared to how it has been historically (since 1989). Because each pixel is normalized to its own historical range, all areas (dry to wet) can appear fully green at some time during the growing season. Departure from Average Greenness Maps - portray how green each pixel is compared to its average greenness for the current week of the year. NOTE - some users may experience a delay in download time.

from Wildland Fire Assessment System website http://www.fs.fed.us/land/wfas/welcome.htm

Live Fuel Moisture - Greenness Maps

Vegetation greenness maps are derived weekly from Normalized Difference Vegetation Index (NDVI) date observed by satellites and provided by the EROS Data Center, US Geological Survey. These maps have a 1 kilometer (.6 mile) spatial resolution. Maps with historical references (RG and DA) are based on the years 1989 through 1995. The derived maps include:

Visual Greenness Maps - portray vegetation greenness compared to a very green reference such as an alfalfa field or a golf course. The resulting image is similar to what you would expect to see from the air. Normally dry areas will never show as green as normally wetter areas.

Relative Greenness Maps - portray how green the vegetation is compared to how it has been historically (since 1989). Because each pixel is normalized to its own historical range, all areas (dry to wet) can appear fully green at some time during the growing season.

Departure from Average Greenness Maps - portray how green each pixel is compared to its average greenness for the current week of the year.

NOTE - some users may experience a delay in download time.

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