ExtractVito: Extract time series from clipped VITO data

In ndvits: NDVI Time series extraction and analysis

Description

Extract time series from clipped VITO data.

Usage

ExtractVito(shapefile, shapedir, ndvidirectory, region, 
    outfile = "TS.txt", Ystart, Yend, shapeext = "shp")

Arguments

shapefile	name of the shape/kml file with multi-points or polygons from where time series are extracted. For a shapefile called ‘name.shp’ , shapefile="name". For a kml file, write the name of the layer.
shapedir	path to the shape/kml file. For a shapefile, shapedir is the path to the folder containing the shapefile. For example if the directory of the shapefile is ‘C:/Dir/name.shp’, shapefile="C:/Dir/". For a kml file, shapedir is the full directory of the kml file. For example shapefile="C:/Dir/name.kml". Please note that paths to files in R can be specified with either "/" or "\\" in Windows OS and "/" in UNIX OS.
ndvidirectory	path to the ndvi images folder (GeoTIFF files). 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. Please refer to details section for more information on the nomenclature.
outfile	name of the file where the time series are saved (extension ".txt"). By default, outfile = " .".
Ystart	starting year of the analysis (in four-digit format).
Yend	ending year of the analysis (in four-digit format).
shapeext	extension of the shape/kml file : "shp" for a Esri shapefile or "kml" for a kml file from Google earth . By default, shapeext = "shp".

Details

Files should follow this 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

Return the time series of the points/polygons in the shapefile over the desired period.

Author(s)

Romain Frelat and Bruno Gerard

See Also

TimeSeriesAnalysis, ClipVGT

Examples

#local variables
ndvidirectory=paste(system.file("extdata/VITO_Mzimba",
    package="ndvits"), "/", sep="")
region="Mzimba"
Ystart=2004
Yend=2009
shape="SLP_Mzimba"
shapedir=paste(system.file("extdata/shape", package="ndvits"),
    "/", sep="")

#executing ExtractFiles
signal = ExtractVito(shape, shapedir, ndvidirectory, region, 
    outfile = "TS-Mzimba.txt", Ystart = Ystart, Yend = Yend)

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