ursa (version 3.10.4)

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, ...)

Value

Object of class ursaRaster

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.

Author

Nikita Platonov

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.

Examples

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]))