| E. Falmouth, MA |
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| County: Barnstable |
State: MA |
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| Active Since: 2008 |
Observer: |
| Lat/Long: 41.5,-70.5 |
Landsat WRS Path/Row: 11/31 |
| MODIS TIle V/H: 4/12 |
MODIS Line, Samp: 1009.29, 871.04 |
Site/Hive Description:
Site is located on Cape Cod about .25 mi from a large saltwater estuary. Natural vegetation is a low mixed pine/oak forest on impoverished, sandy soils; nearby marshes and streams have many willows and several dense standsof black locust exist within 1-3 mi of site.
Hive is located in a sparsely developed residential area with large lots and wooded land interspersed. Climate on our narrow peninsula is strongly influenced by the surrounding ocean temperature, with milder winters, cooler springs and warmer autumns than the rest of New England.
Hive has broad southeasterly exposure, and receives full sun from early morning until ~2pm. Colony consists of dark-colored bees of unknown pedigree that appear to be Carniolan; acquired as a 5-frame nuc from Vermont in May, 2007. Hive is constructed of recycled mahogany shelving and consists of 2 deep boxes with screened bottom board and stand, inner cover and an insulated, weighted telescoping cover.
Scale is a Fairbanks 500lb, .25 lb increments, on cinderblocks.
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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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