Estimates of agricultural-chemical use in counties in the conterminous United States as reported in the 1987 Census of Agriculture
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资源简介：
This coverage contains estimates of agricultural-chemical use in counties in
the conterminous United States as reported in the 1987 Census of Agriculture
(U.S. Department of Commerce, 1989a). Agricultural-chemical use data are
reported as either acres on which used, tons, or as a percentage of county
area. Agricultural-chemical use estimates were generated from surveys of all
farms where $1,000 or more of agricultural products were sold, or normally
would have been sold, during the census year.
Most of the attributes summarized represent 1987 data, but some information
from the 1982 Census of Agriculture also was included.
The polygons representing county boundaries in the conterminous United States,
as well as lakes, estuaries, and other nonland-area features were derived from
the Digital Line Graph (DLG) files representing the 1:2,000,000-scale map in
the National Atlas of the United States (1970).
提供机构：
CEOS_EXTRA
