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04/12 - 04/25/2006

COMPARABLE 2005 PERIOD: 04/13 - 04/26/2005

NDVI data calculated from the AVHRR sensor on the NOAA-17 satellite are used to create vegetation condition imagery beginning in March of the 2005 crop season. No water vapor correction was applied. The images selectable below include displays of the NDVI index for selected US areas. Ratio images to the previous year are shown. Agricultural Statistics District (ASD) and/or county boundaries are shown where the resolution allows. Thumbnail images, which start when at least eight prior periods are available, allow season to-date review. US images with average first frost isolines overlaying NDVI are available starting with the period containing September 1st. Select a GIF or PDF image to view from the tables below. Images are in GIF format unless otherwise noted.

Note: Due to the start of weekly posting in 2006 and the reprocessing of 2005 with updated calibration coefficients, some comparable 2005 data for this period is not yet available. Side-by-side and ratio images for this period are greyed out (not selectable), but will be put online as they become available.

Biweekly NDVI Displays:
2006 Continental US US w/Average 1st Frost 9 Period US Thumbnail 2005 Comparable Period
KS/OK '06 & '05 ND/SD/NE '06 & '05 IL/IN/IA/MO '06 & '05 WA/OR/ID '06 & '05
Southeast US '06 & '05 CA/NV '06 & '05 Miss. Delta '06 & '05 Texas '06 & '05
Northeast '06 & '05 Southwest '06 & '05 Nebraska '06  

Ratio Comparison to Previous Year, in Percent:
Continental US US w/Average 1st Frost 9 Period US Thumbnail
TX/LA Northeast Southwest

Browse Continental US (PDF Format)
Biweekly NDVI Biweekly NDVI w/Frost Ratio/Previous Ratio/Previous w/Frost

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