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Athens, GA
Return to Regional/National map
County:  Clark State: GA
Active Since: 2011 Observer: Vonk
Lat/Long: 33.9, -83.3 Landsat WRS Path/Row: 18/36
MODIS TIle V/H: 0/0 MODIS Line, Samp: 0.00, 0.00

Site/Hive Description:

The six colony apiary sits at the edge of an urban to rural transition. The area is partially wooded, with fields and residences intermixed. The hives were moved to Athens in September 2011 from Scaly Mountain pending fabrication of other units.

The hive consists of a 10-frame brood chamber of 2 deeps, with 2-4 8 frame mediums for honey supers. The queen is a local mutt captured from a swarm.

The hive is exposed to weather, the scale is beneath the hive and protected from inclement weather. The scale is a home-crafted electronic logging scale fabricated from an Adam Equipment CPWplus200 440 capacity scale with R S232 interface, sampling at 5 min intervals. Resolution is 0.1 lb. The information is accessable on the internet at

For more information and data, contact the observer at

Nectar Flow Data 2011

Download Data File (comma delimited), download QA flag key


Nectar Flow Data 2012

Download Data File (comma delimited), download QA flag key



MODIS Subset Data (from the ORNL DAAC)
Red dots are the average of all pixels with acceptable quality (see landcover extract below for area covered).
Blue dots are the center pixel only (point is not plotted if the pixel is of unacceptable quality).




The Normalized Difference Vegetation Index (NDVI) is the ratio of the  difference between visible (red) and infra-red (IR) wavebands to the sum of these bands. 

NDVI = nir - red / nir + red

 NDVI provides an indication of the amount and vigor of vegetated  surfaces. 

 NDVI has been widely used with multiple generations of satellite data.


 The Enhnaced Vegetation Index (EVI) is a more complicated combination of wavebands compared to the more widely used index, NDVI.  The advantage of this newer index is improved sensitivity in high biomass regions and reduction in atmospheric influences.
pNIR = NIR reflectance
pRed = red reflectance
pBlue = blue reflectance
C1 = atmosphere resistance red correction coefficient
C2 = atmosphere resistance blue correction coefficient
L = canopy background brightness
G = gain factor

The MODIS sensor on the Terra satellite platform provides us with 16-day composite measures of NDVI/EVI throughout the year.  NASA distributes MODIS data from many of their distributed data centers.

MODIS Land Cover

MODIS Data Subset Citation:
Oak Ridge National Laboratory Distributed Active Archive Center (ORNL DAAC). 2007. MODIS subsetted land products, Collection 4. Available on-line [] from ORNL DAAC, Oak Ridge, Tennessee, U.S.A..

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NASA Official: Sadashiva Devadiga
Last Updated: February 1, 2024