Selected observations and variables from U.S. Geological Survey water quality stations in south San Francisco Bay. Data include <acronym>CTD</acronym> and nutrient measurements.
选择从美国地质调查局在旧金山南湾的水质站的意见和变量。数据包括<acronym> CTD> </首字母缩写和营养物质的测量。
用法----------Usage----------
sfbay
格式----------Format----------
sfbay is a data frame with 23207 observations (rows) of 12 variables (columns):
sfbay是23207意见(行)的12个变量(列)的数据框:
date
date
time
time
stn
stn
depth
depth
chl
chl
dox.pct
dox.pct
spm
spm
ext
ext
sal
sal
temp
temp
nox
nox
nhx
nhx
sfbayStns is a data frame with 16 observations of 6 variables:
sfbayStns是一个数据框有16个观测6个变量:
site
site
description
description
lat
lat
long
long
depthMax
depthMax
distFrom36
distFrom36
sfbayVars is a data frame with 7 observations of 3 variables:
sfbayVars是一个观察3个变量的数据框:
variable
variable
description
description
units
units
sfbayChla is a time series matrix (380 months x 16 stations) of average 0-5 m chlorophyll a concentrations calculated from the data in sfbay.
sfbayChla是一个时间序列矩阵(380个月x16站),平均0-5米叶绿素a浓度计算中的数据sfbay。
Details
详细信息----------Details----------
The original downloaded dataset was modified by taking a subset of six well-sampled stations and the period 1985–2004. Variable names were also simplified. The data frames sfbayStns and sfbayVars describe the stations and water quality variables in more detail; they were created from information at the same web site. Note that the station numbers in sfbayStns have been prefixed with s to make station codes into legal R variable names. sfbayChla was constructed from the entire downloaded sfbay dataset and encompasses the period 1969–2009.
原来下载的数据集的一个子集的6个采样良好的站期间2085至04年进行了修改。变量的名字也被简化。数据框sfbayStns和sfbayVars描述站和水质更详细的变量,他们被创建在同一网站的信息。需要注意的是sfbayStns前缀s已站号站代码到法律R变量名。 sfbayChla从整个下载sfbay数据集的构建,包括期间1969-2009。
源----------Source----------
Downloaded from http://sfbay.wr.usgs.gov/access/wqdata on 2009-11-17.
2009-11-17下载http://sfbay.wr.usgs.gov/access/wqdata。
实例----------Examples----------
data(sfbay)
str(sfbay)
str(sfbayStns)
str(sfbayVars)
plot(sfbayChla[, 1:10], main = "SF Bay Chl-a")