Data Set Name:  NDVI 2001

Contact Person  Steven F. Oberbauer
        Department of Biological Sciences
        Florida International University
        Miami, FL 33199
        ph: 305-348-2580
        email: oberbaue@fiu.edu

Source of support: OPP-9907185.  This work is part of the U.S.effort of the     
international tundra experiment (ITEX)

Study site      Toolik Lake Field station, east facing slope aboveentrance 
stream to lake

Purpose:        document differences in on study site in control andtreatment 
plots

Treatments      controls, snow removal (May 2), snow removal + soilheating 
(heating started May 4).

Design  10 replicates of each treatment in randomized blocks located 3m apart.  
Treatment plots are 1.5 x 1.5 m.

Sampling frequency   approximately biweekly over the growing season

Techniques      We used a digital camera (Dycan ADC agricultural camera) to 
monitor changes in Normalized Difference Vegetation Index (NDVI) on our season-
length manipulation treatments.  The camera uses optical filters to select the 
desired wavelengths.  Digital images were taken biweekly throughout the growing 
season in 1999.  The camera was calibrated to a teflon reference plate.  Images 
were analyzed using image analysis software (BRIV-32) which calculates NDVI and 
maps it in false color on to the image.  We attempted to take images only under
sunny conditions but that was not always possible.

Level of precision      0.05-0.1

Data Format     Microsoft Excel 97.

Computer        Data prepared on Dell Optiplex running Windows 95

Data fields     YYYYMMDD (integer), Treatment (alphanumeric), Plot (integer), 
NDVI_base (real), NDVI_plot, Calplate (real). 

Conditions for use:     Permission of contact required prior to release.

NOTE: Snow covered plots (controls) are not sampled in early season.