clumpSize: Calculate size of pixel clumps in a RasterLayer

In loicdtx/bfastSpatial: Utilities to monitor for change on satellite image time-series

Description

Calculate the size of pixel clumps in a RasterLayer. The clump area is assigned to each clump, and araster with identical dimensions, but values representing the clump size is output. The definition of a pixel clump follows that of clump, where diagonals are either included or ignored in defining clumps. An optional conversion factor can be supplied based on pixel size.

Usage

clumpSize(x, f = 1, stats = FALSE, ...)

Arguments

x	RasterLayer.
f	Numeric. Optional: conversion factor for number of pixels (e.g. f=900/10000 for converting Landsat pixels to area in hectares).
stats	Logical. Include summary statistics per clump? If TRUE, a list with (1) a raster layer showing clump sizes and (2) a summary table per clump. If FALSE, only a raster layer is returned.
...	Additional arguments to pass to clump

Details

Note that if stats=TRUE, a summary table is also produced. This table is not the same table that would result if the resulting raster was passed to summary. The summary table in this case is based on pixel clumps, rather than individual pixel values. The conversion factor f is also factored into the summary table.

Value

If stats=FALSE, a raster layer with pixel values indicating the size of the clumps to which those pixels belong. If stats=TRUE, a list with 2 objects: (1) a raster layer as above; and (2) a summary table of the pixel clump sizes.

Author(s)

Ben DeVries

loicdtx/bfastSpatial documentation built on May 21, 2019, 7:37 a.m.