Download MODIS product files

Need maintenance for the directory path change in NASA EOSDIS. This function first retrieves the all hdf download links on a certain day, then only selects the relevant tiles from the retrieved links. Download is only done at the queried horizontal-vertical tile number combinations. An exception is MOD06_L2 product, which is produced every five minutes every day.

Usage

download_modis(
  product = c("MOD09GA", "MYD09GA", "MOD09GQ", "MYD09GQ", "MOD09A1", "MYD09A1",
    "MOD09Q1", "MYD09Q1", "MOD11A1", "MYD11A1", "MOD11A2", "MYD11A2", "MOD11B1",
    "MYD11B1", "MOD13A1", "MYD13A1", "MOD13A2", "MYD13A2", "MOD13A3", "MYD13A3",
    "MOD06_L2", "MCD19A2", "VNP46A2"),
  version = "61",
  horizontal_tiles = c(7, 13),
  vertical_tiles = c(3, 6),
  mod06_links = NULL,
  nasa_earth_data_token = NULL,
  date = c("2023-09-01", "2023-09-01"),
  directory_to_save = NULL,
  acknowledgement = FALSE,
  download = FALSE,
  remove_command = FALSE,
  hash = FALSE
)

Arguments

product: character(1). One of c("MOD09GA", "MOD11A1", "MOD06_L2", "MCD19A2", "MOD13A2", "VNP46A2")
version: character(1). Default is "61", meaning v061.
horizontal_tiles: integer(2). Horizontal tile numbers c({start}, {end}). Default is c(7, 13).
vertical_tiles: integer(2). Vertical tile numbers c({start}, {end}). Default is c(3, 6).
mod06_links: character(1). CSV file path to MOD06_L2 download links from NASA LAADS MOD06_L2. Default is NULL.
nasa_earth_data_token: character(1). Token for downloading data from NASA. Should be set before trying running the function.
date: character(1 or 2). length of 10. Date or start/end dates for downloading data. Format "YYYY-MM-DD" (ex. January 1, 2018 = "2018-01-01"). Note: ignored if product == "MOD06_L2".
directory_to_save: character(1). Directory to save data.
acknowledgement: logical(1). By setting TRUE the user acknowledges that the data downloaded using this function may be very large and use lots of machine storage and memory.
download: logical(1). Download data or only save wget commands.
remove_command: logical(1). Remove (TRUE) or keep (FALSE) the text file containing download commands.
hash: logical(1). By setting TRUE the function will return an rlang::hash_file() hash character corresponding to the downloaded files. Default is FALSE.

Value

For hash = FALSE, NULL
For hash = TRUE, an rlang::hash_file character.
HDF (.hdf) files will be stored in year/day_of_year sub-directories within directory_to_save.

Note

Both dates in date should be in the same year. Directory structure looks like input/modis/raw/{version}/{product}/{year}/{day_of_year}.

References

Lyapustin A, Wang Y (2022). “MODIS/Terra+Aqua Land Aerosol Optical Depth Daily L2G Global 1km SIN Grid V061.” doi:10.5067/MODIS/MCD19A2.061 , https://lpdaac.usgs.gov/products/mcd19a2v061/.

MODIS Atmosphere Science Team (2017). “MODIS/Terra Clouds 5-Min L2 Swath 1km and 5km.” doi:10.5067/MODIS/MOD06_L2.061 , https://ladsweb.modaps.eosdis.nasa.gov/missions-and-measurements/products/MOD06_L2.

Vermote E, Wolfe R (2021). “MODIS/Terra Surface Reflectance Daily L2G Global 1km and 500m SIN Grid V061.” doi:10.5067/MODIS/MOD09GA.061 , https://lpdaac.usgs.gov/products/mod09gav061/.

Wan Z, Hook S, Hulley G (2021). “MODIS/Terra Land Surface Temperature/Emissivity Daily L3 Global 1km SIN Grid V061.” doi:10.5067/MODIS/MOD11A1.061 , https://lpdaac.usgs.gov/products/mod11a1v061/.

Didan K (2021). “MODIS/Terra Vegetation Indices 16-Day L3 Global 1km SIN Grid V061.” doi:10.5067/MODIS/MOD13A2.061 , https://lpdaac.usgs.gov/products/mod13a2v061/.

Román MO, Wang Z, Sun Q, Kalb V, Miller SD, Molthan A, Schultz L, Bell J, Stokes EC, Pandey B, Seto KC, Hall D, Oda T, Wolfe RE, Lin G, Golpayegani N, Devadiga S, Davidson C, Sarkar S, Praderas C, Schmaltz J, Boller R, Stevens J, Ramos González OM, Padilla E, Alonso J, Detrés Y, Armstrong R, Miranda I, Conte Y, Marrero N, MacManus K, Esch T, Masuoka EJ (2018). “NASA's Black Marble nighttime lights product suite.” Remote Sensing of Environment, 210, 113–143. ISSN 00344257, doi:10.1016/j.rse.2018.03.017 , https://linkinghub.elsevier.com/retrieve/pii/S003442571830110X.

Author