periodtoMap: period to full path of the NDVI map.
In ndvits: NDVI Time series extraction and analysis

Description Usage Arguments Details Value Author(s) See Also Examples

Returns the full path of the map of a given period and a given year.

1	periodtoMap(ndvidirectory, region, year, period, type = "VITO_CLIP")

`ndvidirectory`	path of the ndvi image folder (GeoTIFF files). /cr Please note that paths to files in R can be specified with either "/" or "\\" in Windows OS and with "/" in UNIX OS.
`region`	name of the region, same as in the name of the ndvi images.
`year`	year of the map to load
`period`	period of the map to load. Be careful, for GIMMS data, period is between 1 and 24 while for VITO data, period is between 1 and 36.
`type`	type of nomenclature followed by the NDVI images : "VITO_CLIP", "VITO_VGT" or "GIMMS" (see details for more information). By default, `type` = "VITO_CLIP".

More about the variable type :
type = GIMMS : nomenclature from Global Land Cover Facility
[RE][YY][MMM][DDD].[SAT]-VIg.tif

RE : identifies the continent (AF for Africa,AZ for Australia and New Zealand, EA for Eurasia, NA for North America and SA for South America and Central America)
YY : the two last digits of the year
MMM : three-letter abbreviation of the month
DDD : identifies the composite period, 15a denotes the days 1-15 of the month, and 15b denotes the days from 16 to the end of the month.
SAT : identifies the satellite, NOAA-7, 9, 11, 14, 16, or 17 from which the data originated.

type = VITO_VGT : FreeVGT VITO's nomenclature
NDV_[YYYYMMDD]_[REGION]_Extract.tif

YYYY : identifies the year (four digits)
MM : identifies the months (two digits)
DD : identifies the date of the period : "01", "11" or "21" (10-day composite).
REGION : idendifies the region selected while extracting maps

type = VITO_CLIP : nomenclature after clipping the images in a particular region.
[REGION][YYYY]M[MM]P[D].tif

REGION : the region as entered while clipping data.
YYYY : identifies the year (four digits)
MM : identifies the months (two digits)
D : identifies the period (0, 1 or 2).

Returns the complete path of the desired map. If the map doesn't exist, an error message is displayed.

Romain Frelat and Bruno Gerard

timetoMap

library(ndvits)
# Local variables
ndvidirectory=paste(system.file("extdata/VITO_Mzimba", package="ndvits"), "/", sep="")
region="Mzimba"
year=2004
period=15

filein=periodtoMap(ndvidirectory,region, year, period)
print(filein)