constructNWISURL {dataRetrieval}

Construct NWIS url for data retrieval

Description

Imports data from NWIS web service. This function gets the data from here: https://nwis.waterdata.usgs.gov/nwis/qwdata A list of parameter codes can be found here: https://nwis.waterdata.usgs.gov/nwis/pmcodes/ A list of statistic codes can be found here: https://nwis.waterdata.usgs.gov/nwis/help/?read_file=stat&format=table

Usage

constructNWISURL(
  siteNumbers,
  parameterCd = "00060",
  startDate = "",
  endDate = "",
  service,
  statCd = "00003",
  format = "xml",
  expanded = TRUE,
  ratingType = "base",
  statReportType = "daily",
  statType = "mean"
)

Arguments

siteNumbers

string or vector of strings USGS site number. This is usually an 8 digit number

parameterCd

string or vector of 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.

endDate

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

service

string USGS service to call. Possible values are "dv" (daily values), "uv" (unit/instantaneous values), "qw" (water quality data), "gwlevels" (groundwater),and "rating" (rating curve), "peak", "meas" (discrete streamflow measurements), "stat" (statistics web service BETA).

statCd

string or vector USGS statistic code only used for daily value service. This is usually 5 digits. Daily mean (00003) is the default.

format

string, can be "tsv" or "xml", and is only applicable for daily and unit value requests. "tsv" returns results faster, but there is a possibility that an incomplete file is returned without warning. XML is slower, but will offer a warning if the file was incomplete (for example, if there was a momentary problem with the internet connection). It is possible to safely use the "tsv" option, but the user must carefully check the results to see if the data returns matches what is expected. The default is therefore "xml".

expanded

logical defaults to TRUE. If TRUE, retrieves additional information, only applicable for qw data.

ratingType

can be "base", "corr", or "exsa". Only applies to rating curve data.

statReportType

character Only used for statistics service requests. Time division for statistics: daily, monthly, or annual. Default is daily. Note that daily provides statistics for each calendar day over the specified range of water years, i.e. no more than 366 data points will be returned for each site/parameter. Use readNWISdata or readNWISdv for daily averages. Also note that "annual" returns statistics for the calendar year. Use readNWISdata for water years. Monthly and yearly provide statistics for each month and year within the range individually.

statType

character Only used for statistics service requests. Type(s) of statistics to output for daily values. Default is mean, which is the only option for monthly and yearly report types. See the statistics service documentation at https://waterservices.usgs.gov/docs/statistics/ for a full list of codes.

Value

url string

Examples

site_id <- "01594440"
startDate <- "1985-01-01"
endDate <- ""
pCode <- c("00060", "00010")
url_daily <- constructNWISURL(site_id, pCode,
  startDate, endDate, "dv",
  statCd = c("00003", "00001")
)
url_unit <- constructNWISURL(site_id, pCode, "2012-06-28", "2012-06-30", "iv")

url_qw_single <- constructNWISURL(site_id, "01075", startDate, endDate, "qw")
url_qw <- constructNWISURL(
  site_id, c("01075", "00029", "00453"),
  startDate, endDate, "qw"
)
url_daily_tsv <- constructNWISURL(site_id, pCode, startDate, endDate, "dv",
  statCd = c("00003", "00001"), format = "tsv"
)
url_rating <- constructNWISURL(site_id, service = "rating", ratingType = "base")
url_peak <- constructNWISURL(site_id, service = "peak")
url_meas <- constructNWISURL(site_id, service = "meas")
urlQW <- constructNWISURL("450456092225801", "70300",
  startDate = "", endDate = "",
  "qw", expanded = TRUE
)