| Woodbine2, MD |
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| County: Howard |
State: MD |
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| Active Since: 2008 |
Observer: Harbin |
| Lat/Long: 39.3, -77.0 |
Landsat WRS Path/Row: 15/33 |
| MODIS TIle V/H: 5/12 |
MODIS Line, Samp: 78.87, 48.68 |
Site/Hive Description:
Hive is located close to several large farms that grow corn, soybeans, clover and alfalfa. There are also many single family homes on lots of three acres with various lawn shrubs and flowering trees. South facing hive with afternoon shade. Hive has two deeps and a medium of very hard working Carniolians. This (2008) is the second year of the queen (yellow dot). Fairbanks- platform 17""x22Ó 1,000 lb capacity, 0.5 lb increments, leveled on pea gravel base, exposed to weather.
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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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