dataRetrieval (version 2.5.1)

readNWISuv: Instantaneous value data retrieval from USGS (NWIS)

Description

Imports data from NWIS web service. This function gets the data from here: http://waterservices.usgs.gov/ A list of parameter codes can be found here: http://nwis.waterdata.usgs.gov/nwis/pmcodes/ A list of statistic codes can be found here: http://nwis.waterdata.usgs.gov/nwis/help/?read_file=stat&format=table. More information on the web service can be found here: http://waterservices.usgs.gov/rest/IV-Service.html.

Usage

readNWISuv(siteNumbers, parameterCd, startDate = "", endDate = "", tz = "")

Arguments

siteNumbers

character USGS site number (or multiple sites). This is usually an 8 digit number

parameterCd

character USGS parameter code. This is usually an 5 digit number.

startDate

character starting date for data retrieval in the form YYYY-MM-DD. Default is "" which indicates retrieval for the earliest possible record. Simple date arguments are specified in local time. See more information here: http://waterservices.usgs.gov/rest/IV-Service.html#Specifying.

endDate

character ending date for data retrieval in the form YYYY-MM-DD. Default is "" which indicates retrieval for the latest possible record. Simple date arguments are specified in local time. See more information here: http://waterservices.usgs.gov/rest/IV-Service.html#Specifying.

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:

Name	Type
Description	agency_cd
character	The NWIS code for the agency reporting the data
site_no	character
The USGS site number	dateTime
POSIXct	The date and time of the value converted to UTC
tz_cd	character
The time zone code for dateTime	code
character	Any codes that qualify the corresponding value
value	numeric
The numeric value for the parameter	Name

Note that code and value are repeated for the parameters requested. The names are of the form: X_D_P_S, where X is literal, D is an option description of the parameter, P is the parameter code, and S is the statistic code (if applicable).There are also several useful attributes attached to the data frame:

Name	Type
Description	url
character	The url used to generate the data
siteInfo	data.frame
A data frame containing information on the requested sites	variableInfo
data.frame	A data frame containing information on the requested parameters
statisticInfo	data.frame
A data frame containing information on the requested statistics on the data	queryTime
POSIXct	The time the data was returned

See Also

renameNWISColumns, importWaterML1

Examples

siteNumber <- '05114000'
parameterCd <- '00060'
startDate <- "2014-10-10"
endDate <- "2014-10-10"
## Not run: 
# rawData <- readNWISuv(siteNumber,parameterCd,startDate,endDate)
# 
# timeZoneChange <- readNWISuv(c('04024430','04024000'),parameterCd,
#          "2013-11-03","2013-11-03")
#  
# centralTime <- readNWISuv(siteNumber,parameterCd,
#                            "2014-10-10T12:00", "2014-10-10T23:59",
#                            tz="America/Chicago")
# 
# # Adding 'Z' to the time indicates to the web service to call the data with UTC time:
# GMTdata <- readNWISuv(siteNumber,parameterCd,
#                            "2014-10-10T00:00Z", "2014-10-10T23:59Z")
# ## End(Not run)