Winter Bird Counts at SERC.
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https://cmr.earthdata.nasa.gov/search/concepts/C1214608859-SCIOPS.html
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资源简介：
Volunteers (# Range: 7-22) walked and drove through 4 areas (70 km2
site size) around SERC property and recorded the number of each species of
bird that they saw. Most observations were done between 8:00 am and
4:00 pm on one day in the middle of winter (usually in Jan.). Surveys
were conducted in 1982, 1983, 1989-2000 so far.
Information to create metadata was taken from information at:
http://serc.si.edu/research/longterm_data/dtoc/bird002.htm
提供机构：
SCIOPS
