specVar: specVar

In RRemelgado/rsMove: Guidelines for the use of Remote Sensing in Movement Ecology

Description

Tool to support the selection of adequate satellite spatial resolution. Evaluates how the spectral variability within a pixel change with the change in spatial resolution.

Usage

specVar(x, y)

Arguments

x	Object of class RasterLayer.
y	Spatial resolution (unit depends on the spatial projection).

Details

Given a raster object (x), the function determines how degrading its spatial resolution impacts our ability to perceive the complexity of the landscape. For the pixel resolution given by y, The function resamples x and estimates the Mean Absolute Percentage Error (MAPE) for each pixel. The MAPE is estimated as 100 / n * sum(abs(O - A / O) where O are the original value in x, A the aggregated value in the aggregated image and n the number of non-NA pixels in the original image The output of the function consists of:

• mape - MAPE raster.

• plot - Histogram of mape.

Value

A list.

See Also

tMoveRes sMoveRes

Examples

## Not run: 

 require(raster)

 # read raster data
 r <- raster(system.file('extdata', '2013-07-16_ndvi.tif', package="rsMove"))

 # apply function
 s.var <- specVar(r, 60)


## End(Not run)

RRemelgado/rsMove documentation built on June 7, 2020, 5:12 p.m.