crop.bands {ASIP}

R Documentation

Cropping of satellite image bands

Description

Crop desired satellite image bands either using a shapefile or draw custom extent from a plot image while running the function.

Usage

crop.bands(directory = getwd(), crop = "n", ext2crop = "none",
  op_directory = directory, b1 = 1, b2 = 1, b3 = 1, b4 = 1, b5 = 1,
  b6 = 1, b7 = 1)

Arguments

ext2crop, crop, directory	Same as mentioned in arvi.
op_directory	Specify the output directory (within double quotes). By default the input satellite image directory will be selected as the output directory.
b1	By default Band1 will be cropped. To cancel cropping of this band assign value 0.
b2	By default Band2 will be cropped. To cancel cropping of this band assign value 0.
b3	By default Band3 will be cropped. To cancel cropping of this band assign value 0.
b4	By default Band4 will be cropped. To cancel cropping of this band assign value 0.
b5	By default Band5 will be cropped. To cancel cropping of this band assign value 0.
b6	By default Band6 will be cropped. To cancel cropping of this band assign value 0.
b7	By default Band7 will be cropped. To cancel cropping of this band assign value 0.

Value

Each bands selected will cropped and produce corresponding <bandname>_crop.tif format in the input directory.

Note

1. FILENAMES OF ANY BAND FILES (*.TIF files) SHOULDN'T CHANGED.

2. Windows users should be careful while assigning directory. Use "/" to seperate folders not "\".

Examples

library (raster)
library (rgdal)
# Finding the path of the sample satellite image directory.
# User may define paths directly like "/home/ur_folder" or "C:/ur_folder"
path <- system.file ("TM_sample", package = "ASIP")
shapefil <- paste0 (path, "/test.shp")
# Assign 0 values to band names which are not required
crop.bands (path, crop = "f", ext2crop = shapefil, b3=0, b4=0, b5=0, b6 = 0, b7 = 0)

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