wq (version 0.2-2)

tsMake: Create time series from water quality data

Description

Creates a matrix time series object from an object of class "WqData", either all variables for a single site or all sites for a single variable.

Usage

## S3 method for class 'WqData':
tsMake(object, focus, layer, type = c("ts.mon", "zoo"))

Value

A matrix of class "mts" or "zoo".

Rdversion

1.1

Details

The function currently averages values within the indicated layer for each day, the implicit assumption being that the layer is well-mixed and/or the samples are evenly distributed with depth in the layer. It produces a matrix time series of all variables for the specified site or all sites for the specified variable. A monthly time series is produced, from which a quarterly or annual series can be created if needed. If you want to include observations with missing depths, temporarily assign them to a unique depth within the layer of interest. If you want values for the actual dates of observation, then set type = "zoo".

See Also

WqData-class

Examples

# Create new WqData object
sfb <- wqData(sfbay, c(1, 3:4), 5:12, site.order = TRUE, 
         time.format = "%m/%d/%Y", type = "wide")

y <- tsMake(sfb, focus = 's27', layer = c(0, 2)) 
plot(y, main = 'Station 27')

y <- tsMake(sfb, focus = 'chl', layer = c(0, 5))
plot(y, main = 'Chlorophyll a, ug/L')

y <- tsMake(sfb, focus = 'chl', layer = c(0, 5), type = 'zoo')
head(y)
plot(y, main = 'Chlorophyll a, ug/L')