getCollection: Get available collections of MODIS product(s)
In MODIS: MODIS Acquisition and Processing

Description Usage Arguments Value Author(s) See Also Examples

Checks and retirves MODIS collection.

1 2	getCollection(product, collection=NULL, newest=TRUE, forceCheck=FALSE, as="character", quiet=TRUE)

`product`	Character. MODIS grid product to check for existing collections. For 'MODIS TERRA Vegetation Indices at 250 m ground resolution' use: 'MOD13Q1'. For vegetation indices from TERRA and AQUA use 'MxD13Q1'. See `getProduct()` for supported products.
`collection`	If provided the function only checks if the collection exists and returns the collection number formatted on base of the `as` parameter or a `FALSE` in case the collection doesn't exists. The check is performed on the primary dataseouce 'LP DAAC' https://lpdaac.usgs.gov/.
`newest`	Logical. Default `TRUE`, return only the number of the newest collection. or `FALSE` all available collections
`forceCheck`	Logical. Default `FALSE`, if `TRUE` the function connects to the 'LP DAAC'-FTP and gets available collections. Since the collections doesn't change very frequently this check once done it is rarely needed.
`as`	character. Default `'character'`, and returns the typical 3 digits long collection number ie: `"005"`. Other possibility is to set it to `'numeric'` what would give as a result the numeric `5`
`quiet`	Default `TRUE`

Vector. With three digits character or a numeric value, indicating the collection version(s). And a file in an hidden folder paste(MODIS:::.getDef('localArcPath'),'/.auxiliaries/collections.txt',sep="") as database for further calls. if collection is provided only the (formatted) collection is returned if available or a FALSE if not!

Matteo Mattiuzzi

getProduct

## Not run: 

# update or get collections for MOD11C3 and MYD11C3
getCollection(product="M.D11C3")
getCollection(product="M.D11C3",newest=FALSE)

getCollection(product="M.D11C3",collection=3)
getCollection(product="M.D11C3",collection=41)
getCollection(product="M.D11C3",collection="041")
getCollection(product="M.D11C3",forceCheck=TRUE)

## End(Not run)