Description Usage Format Details Source References Examples
Daily median pH for the Red River of the North at Grand Forks, North Dakota, streamgage 05082500, from March 31, 2001, to December 31, 2011. At the time these data were downloaded, some of it was provisional data subject to revision.
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A dataframe containing 1,737 rows. There are four variables, staid, the USGS streamgage station number; val, the daily meadian pH value in standard unites; dates, the dates of the observations; and qualcode, the USGS data qualification code.
Name | Type | Description |
staid | factor | USGS station identification number |
val | numeric | Daily median pH |
dates | Date | Date of daily value |
qualcode | factor | Qualification code |
pH data for USGS streamgage 05082500, Red River of the North at Grand Forks, North Dakota, from March 31, 2001, to December 31, 2011. At the time these data were downloaded, some of the data were provisional and subject to revision, indicated by "P" in the qualcode column. Definitions of the daily data qualification codes can be found at http://help.waterdata.usgs.gov/codes-and-parameters/daily-value-qualification-code-dv_rmk_cd (U.S. Geological Survey, 2011).
Imported from the USGS Daily Values Site Web Service http://waterservices.usgs.gov/rest/DV-Service.html (U.S. Geological Survey, 2012) using the function importDVs, July 23, 2012.
U.S. Geological Survey, 2011, Daily value qualification code (dv_rmk_cd):
National Water Information System: Help System, accessed September 7,
2012, at
http://help.waterdata.usgs.gov/codes-and-parameters/daily-value-qualification-code-dv_rmk_cd.
U.S. Geological Survey, 2012, National Water Information System (NWISWeb):
U.S. Geological Survey database, accessed July 23, 2012, at
http://waterservices.usgs.gov/.
1 2 3 4 5 6 7 8 | data(exampleWaterData)
par(las=1, tck=0.02, mar=c(3,5,2,2), cex.axis=0.75)
plot(pH05082500$dates, pH05082500$val, type="l",
ylab="Daily median pH, water, \nunfiltered, field, standard units",
xlab="", yaxs='i', xaxs='i', ylim=c(7.4, 9),
xlim=c(as.Date("2007-01-01"), as.Date("2012-01-01")), col="red")
title("Red River of the North at Grand Forks, North Dakota",cex.main=0.95)
summary(pH05082500$val)
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Min. 1st Qu. Median Mean 3rd Qu. Max. NA's
7.600 7.900 8.200 8.158 8.400 8.900 227
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