readNWISqw.Rd

% Generated by roxygen2 (4.0.2): do not edit by hand
\name{readNWISqw}
\alias{readNWISqw}
\title{Raw Data Import for USGS NWIS QW Data}
\usage{
readNWISqw(siteNumbers, parameterCd, startDate = "", endDate = "",
  expanded = TRUE, reshape = FALSE, tz = "")
}
\arguments{
\item{siteNumbers}{character of USGS site numbers.  This is usually an 8 digit number}

\item{parameterCd}{character of USGS parameter code(s).  This is usually an 5 digit number.}

\item{startDate}{character starting date for data retrieval in the form YYYY-MM-DD. Default is "" which indicates
retrieval for the earliest possible record.}

\item{endDate}{character ending date for data retrieval in the form YYYY-MM-DD. Default is "" which indicates
retrieval for the latest possible record.}

\item{expanded}{logical defaults to \code{TRUE}. If \code{TRUE}, retrieves additional information. Expanded data includes
remark_cd (remark code), result_va (result value), val_qual_tx (result value qualifier code), meth_cd (method code),
dqi_cd (data-quality indicator code), rpt_lev_va (reporting level), and rpt_lev_cd (reporting level type). If \code{FALSE},
only returns remark_cd (remark code) and result_va (result value). Expanded = \code{FALSE} will not give
sufficient information for unbiased statistical analysis.}

\item{reshape}{logical, reshape the data. If \code{TRUE}, then return a wide data frame with all water-quality in a single row for each sample.
If \code{FALSE} (default), then return a long data frame with each water-quality result in a single row.}

\item{tz}{character to set timezone attribute of datetime. Default is an empty quote, which converts the
datetimes to UTC (properly accounting for daylight savings times based on the data's provided tz_cd column).
Possible values to provide are "America/New_York","America/Chicago", "America/Denver","America/Los_Angeles",
"America/Anchorage","America/Honolulu","America/Jamaica","America/Managua","America/Phoenix", and "America/Metlakatla"}
}
\value{
A data frame with the following columns:
\tabular{lll}{
Name \tab Type \tab Description \cr
agency_cd \tab character \tab The NWIS code for the agency reporting the data\cr
site_no \tab character \tab The USGS site number \cr
datetime \tab POSIXct \tab The date and time of the value converted to UTC (if asDateTime = TRUE), \cr
\tab character \tab or raw character string (if asDateTime = FALSE) \cr
tz_cd \tab character \tab The time zone code for datetime \cr
code \tab character \tab Any codes that qualify the corresponding value\cr
value \tab numeric \tab The numeric value for the parameter \cr
}

There are also several useful attributes attached to the data frame:
\tabular{lll}{
Name \tab Type \tab Description \cr
url \tab character \tab The url used to generate the data \cr
queryTime \tab POSIXct \tab The time the data was returned \cr
comment \tab character \tab Header comments from the RDB file \cr
siteInfo \tab data.frame \tab A data frame containing information on the requested sites \cr
variableInfo \tab data.frame \tab A data frame containing information on the requested parameters \cr
}
}
\description{
Imports data from NWIS web service. This function gets the data from here: \url{http://nwis.waterdata.usgs.gov/nwis/qwdata}
A list of parameter codes can be found here: \url{http://nwis.waterdata.usgs.gov/nwis/pmcodes/}
A list of statistic codes can be found here: \url{http://nwis.waterdata.usgs.gov/nwis/help/?read_file=stat&format=table}
}
\examples{
siteNumbers <- c('04024430','04024000')
startDate <- '2010-01-01'
endDate <- ''
parameterCd <- c('34247','30234','32104','34220')
\dontrun{
rawNWISqwData <- readNWISqw(siteNumbers,parameterCd,startDate,endDate)
rawNWISqwDataReshaped <- readNWISqw(siteNumbers,parameterCd,
          startDate,endDate,reshape=TRUE)
         }
}
\seealso{
\code{\link{readWQPdata}}, \code{\link{whatWQPsites}},
\code{\link{readWQPqw}}, \code{\link{constructNWISURL}}
}
\keyword{USGS}
\keyword{data}
\keyword{import}
\keyword{service}
\keyword{web}