orgTime: Handle Input and Output Dates Used for Filtering

In MODIS: Acquisition and Processing of MODIS Products

Handle Input and Output Dates Used for Filtering

Description

This function lets you define the period to be filtered, the output temporal resolution, and select the required data from your input files.

Usage

## S4 method for signature 'character'
orgTime(
  files,
  nDays = "asIn",
  begin = NULL,
  end = NULL,
  pillow = 75,
  pos1,
  pos2,
  format = "%Y%j"
)

## S4 method for signature 'Date'
orgTime(files, nDays = "asIn", begin = NULL, end = NULL, pillow = 75)

## S4 method for signature 'Raster'
orgTime(
  files,
  nDays = "asIn",
  begin = NULL,
  end = NULL,
  pillow = 75,
  pos1,
  pos2,
  format = "%Y%j"
)

Arguments

files	A character, Date, or Raster* object. Typically MODIS file names created e.g. from runGdal() or runMrt(), but any other file names holding date information are supported as well. If a Raster* object is supplied, make sure to adjust 'pos1', 'pos2', and 'format' according to its layer raster::names().
nDays	Time interval for output layers. Defaults to "asIn" that includes the exact input dates within the period selected using 'begin' and 'end'. Can also be "1 month" or "1 week", see seq.Date() and Examples.
begin	character. Output begin date, defaults to the earliest input data set.
end	character. Output end date, defaults to the latest input data set. Note that the exact end date depends on 'begin' and 'nDays'.
pillow	integer. Number of days added to the beginning and end of a time series.
pos1, pos2, format	Arguments passed to extractDate().

Value

A list with the following slots (to be completed):

• $inSeq

• $outSeq

• $inDoys

• $inputLayerDates

• $outputLayerDates

• $call

Author(s)

Matteo Mattiuzzi, Florian Detsch

See Also

seq.Date().

Examples

# Using MODIS files
files <- c("MOD13A2.A2010353.1_km_16_days_composite_day_of_the_year.tif",
           "MOD13A2.A2011001.1_km_16_days_composite_day_of_the_year.tif",
           "MYD13A2.A2010361.1_km_16_days_composite_day_of_the_year.tif",
           "MYD13A2.A2011009.1_km_16_days_composite_day_of_the_year.tif")

orgTime(files)
orgTime(files,nDays=2,begin="2010350",end="2011015")

# Using other files, e.g. from AVHRR GIMMS NDVI (Jul 1981 to Dec 1982)
## Not run: 
library(gimms)

files.v1 <- system.file("extdata/inventory_ecv1.rds", package = "gimms")
files.v1 <- readRDS(files.v1)[1:3]
dates.v1 <- monthlyIndices(files.v1, timestamp = TRUE)

orgTime(dates.v1)

## End(Not run)

MODIS documentation built on Jan. 6, 2023, 5:10 p.m.