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Cahaba River, AL
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County:  Jefferson State: AL
Active Since: 2010 Observer: Hurst
Lat/Long: 33.4, -86.7 Landsat WRS Path/Row: 20/37
MODIS TIle V/H: 5/10 MODIS Line, Samp: 786.95, 917.06

Site/Hive Description:

The hive is located in a backyard apiary near the Cahaba River outside of Birmingham. The hilly region is forested, primarily deciduous - mixed southern forest. The hive faces southeast and is located in the in center of group of seven hives on top of a hill with full sun exposure until approximately 2 pm daily.

The colony of three banded Italian bees is in a 10 frame deep plus a shallow honey super on a screened bottom board. The queen was 1.5 yrs old in 2010.

The scale is a Toledo model (#4181), with a 17x22 in. platform, with 1000 lb capacity. The scale sits on a concrete paver base and is exposed. Counterpoise weights were adjusted September 2010 , ±_0.5 gm with electronic kitchen scale.

The principal spring forage consists of tulip trees (April-May), white dutch clover (early April), and wildflowers (March- April).

Nectar Flow Data 2010

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


Nectar Flow Data 2011

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