mf_list_collections_cloud: Check LP DAAC MODIS and VIIRS collections on Earthdata Cloud...

In modisfast: Fast and Efficient Access to MODIS Earth Observation Data

Check LP DAAC MODIS and VIIRS collections on Earthdata Cloud OPeNDAP

Description

CMR is paginated to discover every LPCLOUD collection supported by modisfast. For each collection, the function tests up to 'n_granules' granules (newest first), including a single pixel data request. A successful sample does not imply that every granule or date is available.

Usage

mf_list_collections_cloud(
  collections = NULL,
  time_range = NULL,
  n_granules = 2L,
  verbose = "inform"
)

Arguments

collections	Optional character vector of collection names, for example 'c("MOD11A1.061", "VNP43MA4.002")'. By default check LP DAAC MODIS collections from the modisfast catalogue and tiled VIIRS '.002' collections published by LPCLOUD in CMR.
time_range	Optional one or two Dates restricting sampled granules.
n_granules	Number of granules to check per collection (default 2).
verbose	Character string: '"quiet"', '"inform"' (default), or '"debug"'. Controls progress messages.

Value

A data.frame with collection, collection_id, status, tested, succeeded, checked_at, and detail. Status is 'operational' when all sampled granules served one pixel, 'partial' when only some did, 'unavailable' when none did, and 'no_granules' when CMR found none for the chosen dates. 'unverified' means no suitable two-dimensional variable was found. These statuses apply only to the granules sampled at 'checked_at'.

Examples

## Not run: 
Sys.setenv(EARTHDATA_TOKEN = "your Earthdata bearer token")
status <- mf_list_collections_cloud("VJ121A2.002")
subset(status, status == "operational")
mf_list_collections_cloud("VJ121A2.002",
  time_range = as.Date(c("2026-01-01", "2026-01-30")))

## End(Not run)

modisfast documentation built on Oct. 1, 2026, 1:09 a.m.