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Pacific, MO
Return to Regional/National map
County:  St. Louis State: MO
Active Since: 2012 Observer: Hutchins
Lat/Long: 38.4, -90.7 Landsat WRS Path/Row: 0/0
MODIS TIle V/H: 0/0 MODIS Line, Samp: 0.00, 0.00

Site/Hive Description:

Site is on the north edge of an open 1 acre field about ½ mile from the Meramec river, in a low spot in the hills just above the river valley. Protected by large trees and brush from the north, east and west. Exposed to sun from mid morning to late afternoon.

2 deep brood boxes, currently + 1 medium super. Locally raised Italian queen 1 yr old in 2012.

Howe platform scale, 1,000 lb capacity, graduated in ¼ lb increments, with a small roof over the beam arm.

Dandelion, wild plum, autumn olive, Blackberry, persimmon, crabapple, Black locust, honey locust, clover, soybeans, aster, goldenrod.

Nectar Flow Data 2012

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).



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.


 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.
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 [] from ORNL DAAC, Oak Ridge, Tennessee, U.S.A..

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Last Updated: February 1, 2024