ClipVGT: Clip Vegetation data

In ndvits: NDVI Time series extraction and analysis

Description

Clip the original map over a define rectangle. This operation reduce the size of the map and the time to load it.

Usage

ClipVGT(ndvidirectory, region, xlim, ylim, Ystart, Yend, outdirectory, regionout)

Arguments

ndvidirectory	directory of the original ndvi files
region	name of the region (as coded in the name of the file
xlim	longitude of the desired area
ylim	latitude of the desired area
Ystart	year of start of the clipping process
Yend	year of start of the clipping process
outdirectory	directory where to save the clipped maps
regionout	name of the region of the clipped area

Details

This function takes, as input, maps from FreeVGT (type=VITO_VGT) and save maps with "our" nomenclature (type=VITO_CLIP).

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

• YYYYcorresponging to the year (four digits)

• MMcorresponging to the months (two digits)

• DDcorresponging to the date of the period : "01", "11" or "21" (10-day mesures).

• REGIONthe region selected while extracting maps

Our nomenclature : : (type=VITO_CLIP)
After a process of clipping the images in a particular region, we rename the files as following :
[REGION][YYYY]M[MM]P[D].tif

• REGIONthe region as entered while clipping data.

• YYYYcorresponging to the year (four digits)

• MMcorresponging to the months (two digits)

• Dcorresponding to the period (0, 1 or 2).

Value

Nothing is return, clipped map are saved in the outdirectory.

Author(s)

Romain Frelat and Bruno Gerard

See Also

ExtractVGT, ExtractVito

ndvits documentation built on May 2, 2019, 4:47 p.m.