head: Extract first and last bands of raster image
Description
Functions to extract first bands (head), last bands (tail) and first+last bands (series) of raster image.
Usage
# S3 method for ursaRaster
head(x, n = 3L, ...)
# S3 method for ursaRaster
tail(x, n = 3L, ...)
series(x, n = 3L, s=170, ...)
Arguments
x
Object of class ursaRaster
n
Positive integer. Number of extracted bands.
s
Positive numeric. Maximal size of memory in MB for extracted raster image in the assumption that class of values is numeric.
…
Not used.
Value
Object of class ursaRaster
Details
Function series combines consequtive calling head(x); tail(x) with checking the size of extracted part of raster image. If size exceeds specified value of the argument s, then number of extracted bands n is decreased.
# NOT RUN {session_grid(NULL)
session_grid(regrid(mul=1/8))
a <- ursa_dummy(nband=101)
print(head(a))
print(tail(a))
print(series(a,2))
print(series(a[1:5]))
# }