hydroDat {hmm.discnp}

Canadian hydrological data sets.

Description

Five data sets obtained from the “HYDAT” database, Environment and Climate Change Canada's database of historical hydrometric data. The data were obtained using the tidyhydat package. The data have been trimmed so that there are no gaps in the observation dates and are presented in “raw” form and in discretised form as deciles of the residuals (difference between raw values and the daily mean over years).

Usage

    data("linLandFlows")
    data("ftLiardFlows")
    data("portMannFlows")
    data("portMannSedLoads")
    data("portMannSedCon")

Format

Data frames with observations on the following 3 variables.

Date

Dates on which observations were made.

Value

Numeric vector of observation values.

mean

The mean over years of Value.

resid

The difference Value - mean.

deciles

A factor with levels d1, ..., d10, which are the deciles of the variable resid

Details

The variable mean was calculated as follows:

        yday <- as.POSIXlt(X$Date)$yday
        mn   <- tapply(X$Value,yday,mean,na.rm=TRUE)
        mean <- mn[as.character(yday)]
   

where X is the data set being processed.

The data set linLandFlows originally consisted of 2008 observations; there were 1980 observations after “trimming”. The data set ftLiardFlows originally consisted of 22364 observations; there were 11932 observations after “trimming”. The data set portMannFlows originally consisted of 6455 observations; there were 3653 observations after “trimming”. The data set portMannSedLoads consists of 2771 observations; no observations were trimmed. The data set portMannSedCon consists of 4597 observations; no observations were trimmed.

The units of the “Flows” variables are cubic metres per second (m^3/s); the units of “portMannSedLoads” are tonnes; the units of “portMannSedCon” are milligrams per litre (mg/l).

The “linLandFlows” data were obtained at the Lindberg Landing hydrometric station on the Liard River in the Northwest Territories of Canada. The “ftLiardFlows” data were obtained at the Fort Liard hydrometric station on the Liard River in the Northwest Territories of Canada. The “portMann” data were obtained at the hydrometric station located at the Port Mann pumping station on the Fraser River in the Province of British Columbia in Canada.

Source

Environment and Climate Change Canada's database “HYDAT”, a database of historical hydrometric data. The data were obtained vis the tidyhydat package, which is available from “CRAN”, https://cran.r-project.org

Examples

fit <- hmm(linLandFlows$deciles,K=4,itmax=10)