modisfast (version 1.0.2)

mf_modisfast: Download (and possibly import) MODIS, VIIRS and GPM Earth Observation data

Description

Download and possibly import MODIS, VIIRS and GPM Earth Observation data quickly and efficiently. This function is a wrapper for mf_login, mf_get_url, mf_download_data and mf_import_data. Whenever possible, users should prefer executing the functions mf_login, mf_get_url, mf_download_data and mf_import_data sequentially rather than using this high-level function

Usage

mf_modisfast(
  collection,
  variables,
  roi,
  time_range,
  path = tempfile("modisfast_"),
  earthdata_username,
  earthdata_password,
  parallel = FALSE,
  verbose = "inform",
  import = TRUE,
  ...
)

Value

if the parameter import is set to TRUE, a terra::SpatRast

object ; else a data.frame providing details of the data downloaded (see output of mf_download_data).

Arguments

collection

string. mandatory. Collection of interest (see details of mf_get_url).

variables

string vector. optional. Variables to retrieve for the collection of interest. If not specified (default) all available variables will be extracted (see details of mf_get_url).

roi

object of class sf. mandatory. Area of region of interest. Must be a Simple feature collection with geometry type POLYGON, composed of one or several rows (i.e. one or several ROIs), and with at least two columns: 'id' (an identifier for the roi) and 'geom' (the geometry).

time_range

date(s) / POSIXlt of interest . mandatory. Single date/datetime or time frame : vector with start and end dates/times (see details).

path

string. Target folder for the data to download. Default : temporary folder.

earthdata_username

EarthData username

earthdata_password

EarthData username

parallel

boolean. Parallelize the download ? Default to FALSE

verbose

string. Verbose mode ("quiet", "inform", or "debug"). Default "inform".

import

boolean. Import the data as a SpatRast object ? default TRUE. FALSE will download the data but not import them it in R.

...

Further arguments to be passed to mf_import_data

See Also

mf_login, mf_get_url, mf_download_data, mf_import_data

Examples

if (FALSE) {

### Set-up parameters of interest
coll <- "MOD11A1.061"

bands <- c("LST_Day_1km", "LST_Night_1km")

time_range <- as.Date(c("2017-01-01", "2017-01-30"))

roi <- sf::st_as_sf(
  data.frame(
    id = "roi_test",
    geom = "POLYGON ((-5.82 9.54, -5.42 9.55, -5.41 8.84, -5.81 8.84, -5.82 9.54))"
  ),
  wkt = "geom", crs = 4326
)

### Download and import the data
modis_ts <- mf_modisfast(
  collection = coll,
  variables = bands,
  roi = roi,
  time_range = time_range,
  earthdata_username = "earthdata_un",
  earthdata_password = "earthdata_pw"
 )

### Plot the data
terra::plot(modis_ts)
}