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Gambier, OH
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County:  Knox State: OH
Active Since: 2008 Observer: Bennett
Lat/Long: 40.3, -82.4 Landsat WRS Path/Row: 19/32
MODIS TIle V/H: 4/11 MODIS Line, Samp: 1153.50, 867.04

Site/Hive Description:

The hives are on a hilltop immediately surrounded by pasture, old field and row-crop field (corn-soybean rotation). Nearby are substantial stands of mixed, mesophytic hardwood forest and a few acres of wetland. The site is on the edge of the Wisconsin glacial advance and underlying bedrock is Mississippian sandstones and shales.

Scale is an old Fairbanks platform beam scale, 18"x27” 1000 lb capacity, .5 increments, leveled on wooden platform raised 12” on 4x4 posts.

Typically two deeps with Italian or Carniolan stock. The queen was a year old in 2008.

As far as forage, early in the season we expect wildflower mix and tree pollen (especially cherry); later there will be substantial goldenrod and aster contribution.

Nectar Flow Data 2008

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


Nectar Flow Data 2009

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