getNASA: Find and download NASA products

In rspatial/luna: Tools for Satellite Remote Sensing (Earth Observation) Data Processing

Find and download NASA products

Description

Find and download NASA data for a specific product, area, and time period. The function returned is list of filenames that may have been downloaded.

It is important to fist consult getProducts to discover what products and version numbers are available, and which server to use.

Usage

getNASA(product, start_date, end_date, aoi, version=NULL, download=FALSE, path, 
	username, password, server="LPDAAC_ECS", limit=100000, overwrite=FALSE, ...)

Arguments

product	character. Supported products can be found using getProducts
start_date	character. Start date for the data requested formatted yyyy-m-d
end_date	Character. end date for the data requested formatted yyyy-m-d
aoi	numeric vector of four elements (minimum longitude, maximum longitude, minimum latitude, maximum latitude) encompassing the area of interest. It can also be a SpatExtent, or any object from which an extent can be extracted
version	character. product version number
download	logical. If TRUE data will be downloaded unless it is present in the download directory
path	character. Path name indicating where to store the data
username	character. EOSDIS user name (see Details)
password	character. EOSDIS password (see Details)
server	character. The server to download the data from
limit	positive integer
overwrite	logical. If TRUE, existing files are overwritten
...	Additional arguments. These can be product specific. See Details)

Details

This function is an R interface to the EOSDIS system. Access is free, but it requires a "Earthdata" account. If you do not have an account, you can sign up here: https://urs.earthdata.nasa.gov/users/new

If no data is available between start_date and end_date, files for the closest dates are returned.

Value

Character vector of file names pointing to the downloaded files (if download=TRUE)

See Also

getProducts, getLandsat

Examples

  
product <- "MOD09A1"
# information about the product
getProducts(product)
sdate <- "2019-05-17" 
edate <- "2019-05-23"
area <- c(33, 34, -5, -4)
path <- tempdir()
# list available tiles
f <- getNASA(product = product,
            start_date = sdate, end_date = edate,
            aoi = area, download = FALSE, path=path)
f

# get the date from the filenames
modisDate(f)

# to download the tiles, set download = TRUE
# and provide your credentials 

usr <- "your user name"
pwd <- "your password"
#f <- getNASA(product = product, username=urs, password=pwd,
#            start_date = sdate, end_date = edate,
#            aoi = area, download = TRUE, path=path)

rspatial/luna documentation built on Dec. 26, 2024, 12:33 a.m.