ExtractVGT: Extract time series from VITO Vegetation data
In ndvits: NDVI Time series extraction and analysis

Extract time series from VITO Vegetation data

1 2	ExtractVGT(shapefile, shapedir, ndvidirectory, region, outfile = "TS.txt", Ystart, Yend, shapeext = "shp")

`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 SPOT VGT 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".

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

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

Romain Frelat and Bruno Gerard

VGT ref

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