slope_rast: calculate slope of rast object

In rtrend: Trend Estimating Tools

calculate slope of rast object

Description

calculate slope of rast object

Usage

slope_rast(
  r,
  period = c(2001, 2020),
  outfile = NULL,
  fun = rtrend::slope_mk,
  ...,
  overwrite = FALSE,
  .progress = "text"
)

rast_filter_time(r, period = c(2001, 2020))

Arguments

r	A yearly rast object, which should have time attribute
period	c(year_begin, year_end)
outfile	The path of outputed tiff file. If specified, slope and pvalue will be written into outfile.
fun	the function used to calculate slope, see slope() for details.
...	other parameters ignored
overwrite	logical. If TRUE, outfile is overwritten.
.progress	name of the progress bar to use, see create_progress_bar

Value

A terra rast object, with bands of slope and pvalue.

See Also

terra::rast()

Examples

library(rtrend)
library(terra)

f <- system.file("rast/MOD15A2_LAI_China_G050_2001-2020.tif", package = "rtrend")
r <- rast(f)
r
time(r)

slp <- slope_rast(r,
  period = c(2001, 2020), 
  outfile = "LAI_trend.tif", overwrite = TRUE,
  fun = rtrend::slope_mk, .progress = "none"
)
# if you want to show progress, set `.progress = "text"`
slp
plot(slp)

file.remove("LAI_trend.tif")

rtrend documentation built on Nov. 10, 2022, 6:14 p.m.