Description Usage Arguments Details Value Author(s) See Also Examples
Create a shapefile of points around the points given in the kml/shapefile.
1 | pointtobuffer(shapefile, shapedir, ndvidirectory, region, Ystart, shapeext="shp", outshape = "buffer", outdir = ".", rad = 1, type="VITO_CLIP")
|
shapefile |
name of the shape/kml file with multi-points from where the buffer is created. |
shapedir |
path to the shape/kml file. |
ndvidirectory |
path to the ndvi images folder (GeoTIFF files). |
region |
name of the region, same as in the name of the ndvi images. |
Ystart |
starting 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 . |
outshape |
name of the new shapefile where the buffer is saved. |
outdir |
path to the folder where the new shapefile is saved. |
rad |
radius, maximum distance in pixels. |
type |
type of nomenclature followed by the NDVI images : "VITO_CLIP", "VITO_VGT" or "GIMMS" (see details for more information). |
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).
Nothing is return, a shapefile is created and saved in the folder outdir
, under the name outshape
.
Romain Frelat and Bruno Gerard
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #local variables
shape="SLP_Mzimba"
shapedir=paste(system.file("extdata/shape", package="ndvits"),
"/", sep="")
ndvidirectory=paste(system.file("extdata/VITO_Mzimba",
package="ndvits"), "/", sep="")
region="Mzimba"
Ystart=2004
newshape="BufferMzimba"
dirshape="."
#the shapefile will be saved in the current directory.
pointtobuffer(shape, shapedir, ndvidirectory, region, Ystart,
outshape = newshape, outdir = dirshape)
|
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.