wtss_to_ts {Rwtss}

Export data to be used to the ts format

Description

Converts data from a wtss tibble to a time series "ts". A WTSS tibble contains data retrieved from a WTSS server. These data sets are time series with irregular intervals. Given that of many functions that use the R "ts" format, this function converts a time series (a tibble with data and metadata) to the "ts" format. Since "ts" requires regular time series, it interpolates the original irregular time series to a regular time series. To do this, the user needs to specify a period which is recognised by the "ts" format. This period can be either "month", "week", "day", "months", "weeks", "days" or 12, 52, 365. This function creates a new time series with the required frequency and intepolates the missing values using spline interpolation from the "zoo" package (zoo::na.spline).

Usage

wtss_to_ts(data, band = NULL, period = "week")

Arguments

data

A sits tibble with time series.

band

Name of the band to be exported (optional if series has only one band)

period

One of c("month", "week", "day"), c("months", "weeks", "days") or c(12, 52, 365)

Value

A time series in the ts format.

Author(s)

Gilberto Camara, [e-mail]

Examples

## Not run: 
# connect to a WTSS server
wtss_service <- "https://brazildatacube.dpi.inpe.br/wtss/"
# retrieve a time series
ts_wtss  <- Rwtss::time_series(
                 wtss_service,
                 "MOD13Q1-6", 
                 c("NDVI","EVI"),
                 longitude = -45.00, 
                 latitude  = -12.00,
                 start_date = "2000-02-18", 
                 end_date = "2016-12-18",
                 token = "YOUR-BDC-TOKEN")
# convert to ts
ts <- Rwtss::wtss_to_ts(ts_wtss, band = "NDVI")

## End(Not run)