| Beltsville, MD |
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| County: Prince Georges |
State: MD |
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| Lat/Long: 39, -76.9 |
Observer: Smith |
| Active Since: 2007 |
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Site Description:
Site located is at the USDA’s Beltsville Agricultural Research Center (BARC) Bee Research Laboratory. The BARC facility is extensive and is adjacent to the USFWS Patuxent Wildlife Refuge, another large parcel of undeveloped land. Thus the site is in a region of very extensive mature mixed hardwood and conifers, and also extensive crop and pasture lands within foraging radius. The site is at an elevation of about 160 ft. In the photo here, the red section indicates that there is mite medication on the colony. The box above that is a hive-top feederfor sugar syrup. Scale: Fairbanks Model 1124, 0.5 lb divisions, new in 2007. Weights maintained 2/07.
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| Nectar Flow Data 2007 | Download Data File (comma delimited) 
| | | Nectar Flow Data 2008 | Download Data File (comma delimited) 
| | | Nectar Flow Data 2009 | Download Data File (comma delimited) ,MD_plot.png)
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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). |
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| 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.
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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
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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.
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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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| Meteorological Data |
coming soon...
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