| Williamsport, MD |
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| County: Washington |
State: MD |
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| Active Since: 2008 |
Observer: Troup |
| Lat/Long: 39.5, -77.8 |
Landsat WRS Path/Row: 16/33 |
| MODIS TIle V/H: 5/12 |
MODIS Line, Samp: 47.50, 4.14 |
Site/Hive Description:
Hive is located in a low density residential in rural area with pasture land and patches of mature hardwood forest land. Near Potomac River. Open southeast exposure, sparse woods on property. Colony:
Double deeps. 2008 Troup queen stock. 2009 colony swarmed an requeened. Requeened from purchased queen in Aug. Scale: Fairbanks, 0.5 lb increments. Scale on patio blocks, base exposed to weather, weighing elements protected. Calibrated June 2008. Forage:
April Dandelion, May Black Locust, May/June Clover, Tulip Poplar, July/Aug Bee-bee tree, Sep/Oct Milkweed, Goldenrod/Aster
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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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