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ABOUT SCALE HIVES HONEYBEES SITE DATA NEWS LINKS
Blandy Exp. Farm, VA
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County:  Clarke State: VA
Active Since: 2010 Observer: Roulston
Lat/Long: 39, -78.1 Landsat WRS Path/Row: 16/33
MODIS TIle V/H: 5/11 MODIS Line, Samp: 111.84, 1125.96

Site/Hive Description:

Scale hive is located at the Blandy Experimental Farm, a 700-acre University of Virginia research facility and arboretum in the Shenandoah Valley. The surrounding landscape is mixed agricultural. There are three hives located at interfaces of 100 yr old mixed hardwood lots with crops and pastureland.

Colonies:
The colonies are in 2-3 mediums, of indeterminate strain, with supers added by the beekeeper as needed. In 2010 they were weighed weekly.

Scale:
The scale is a battery operated mobile postal scale with 150 lb capacity with 0.2 lb intervals. It is placed on a jack under the hive and raised to record the weight. If necessary, the supers are weighed separately.

Forage:
Major forage sources are black locust and tulip trees in May, bee bee tree in July, spiny plumeless thistle in June-August, and Canada thistle in June-July.


Nectar Flow Data 2010

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).

 

NDVI

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.

EVI

 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.
where,
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 [http://www.daac.ornl.gov/MODIS/modis.html] from ORNL DAAC, Oak Ridge, Tennessee, U.S.A..


 
 
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Last Updated: February 1, 2024