Go to the NASS Home Page U.S. Department of Agriculture
National Agricultural Statistics Service
Research and Development Division

of the Director
Census and Survey Research Branch
Data Quality | Statistical Methodology
Geospatial Information Branch
Area Frame | Spatial Analysis

Vegetation Condition Formats
Main | History | Limitations | Products | Sensors | Formats | Download

New vegetation condition images are created every week during the crop season. Historically, they were created every two weeks. These images are in GIF format, type GIF87A. The images are 256 color (8-bit) GIF's created using a 1024x768 screen resolution (viewing at 640x480 will cause further sampling). The images are derived directly from postscript print files intended for 11"x17" color prints; they are approximately 300 - 500K bytes in size.

Starting in 1999, the images for the entire US (NDVI, Ratio/Previous, and Ratio/Median - as available) for a given period are also being created in an Adobe PDF format. The PDF format allows for browsing user-defined areas and zooming in more closely to view them. The PDF files were created with 256 colors for printing on 8.5"x11" size paper. Anyone with a standard Acrobat reader will be able to view the files. The PDF images have a higher resolution that the GIF files, but are also much larger; PDF images may be as large as 2.0MB.

Starting with the 2004 season, the entire US NDVI composite for each period has been or will be converted to a GeoTiff image for use in geographic information systems software. (2011 will be loaded as available). Due to the size of these files (13-14 MB), each GeoTiff has been compressed into a "Tar" format file for easier download (4-5 MB). Select the "Download" option above to access these tiff files. Standard products are selectable below:

For more information about this topic or about the NASS Spatial Analysis Research Section (SARS), contact the GeoSpatial Information Branch at HQ_RDD_GIB@nass.usda.gov.

Available Years (Return to Standard Graphics Products)
NOAA-18: 2011 2010
NOAA-17: 2009 2008 2007 2006 2005 2004
NOAA-16: 2003 2002 2001
NOAA-14: 1999 1998 1997 1996 1995

Growing Season Animations | National Crop Progress

Back | NASS Home| USDA Home| USDA Remote Sensing Page