histogram-methods: Histogram of Raster objects.

In rasterVis: Visualization Methods for Raster Data

Histogram of Raster objects.

Description

Draw histograms (with lattice) of Raster objects.

Usage

## S4 method for signature 'Raster,missing'
histogram(x, data=NULL, layers, FUN,
            maxpixels = 1e+05, nint=100,
            xlab='', ylab='', main='', col='gray',
            between=list(x=0.5, y=0.2),
            as.table=TRUE,
            scales=list(x=list(relation='free'),
              y=list(relation='free',
                draw=FALSE)),
            names.attr,
            par.settings=rasterTheme(),
            att = 1,
            ...)

## S4 method for signature 'SpatRaster,missing'
histogram(x, data=NULL, layers, FUN,
            maxpixels = 1e+05, nint=100,
            xlab='', ylab='', main='', col='gray',
            between=list(x=0.5, y=0.2),
            as.table=TRUE,
            scales=list(x=list(relation='free'),
              y=list(relation='free',
                draw=FALSE)),
            names.attr,
            par.settings=rasterTheme(),
            att = 1,
            ...)

## S4 method for signature 'formula,Raster'
histogram(x, data, dirXY,
            maxpixels = 1e+05,
            strip=TRUE,
            par.settings=rasterTheme(),
            att = 1,
            ...)

## S4 method for signature 'formula,SpatRaster'
histogram(x, data, dirXY,
            maxpixels = 1e+05,
            strip=TRUE,
            par.settings=rasterTheme(),
            att = 1,
            ...)

Arguments

x	A Raster* object, a SpatRaster object or a formula.
data	NULL, a Raster object, or SpatRaster object.
layers	A numeric or character which should indicate the layers to be displayed.
dirXY	A direction as a function of the coordinates (see xyLayer).
FUN	A function to applied to the z slot of a RasterStackBrick object or to the time index of the SpatRaster object. The result of this function is used as the grouping variable of the plot.
nint	Number of breaks for the histogram. See the documentation of lattice::histogram at lattice for details.
maxpixels	A numeric, for sampleRandom or spatSample.
att	If x is a factor, integer or character to choose which variable (column) in the RAT table should be used.
xlab, ylab, main, col	Arguments for histogram.
names.attr	Character or expression, names to use in each panel. If missing its default value is the result of names(x) (after subsetting the layers to be displayed).
between, as.table, scales, strip, par.settings	Graphical parameters of lattice. See lattice::xyplot for details.
...	Additional arguments for lattice::histogram

Note

If you need different breakpoints in each panel, set breaks explicitely with NULL, a numeric or a character (for example, 'Sturges'; see hist for details)

Author(s)

Oscar Perpiñán Lamigueiro

See Also

histogram,xscale.raster, yscale.raster, rasterTheme

Examples

library(raster)
library(terra)

f <- system.file("external/test.grd", package="raster")
r <- raster(f)
histogram(r)
s <- stack(r, r+500, r-500)
## Same breakpoints across panels
histogram(s)
## Each panel with different breakpoints
histogram(s, breaks=NULL)
histogram(s, breaks='Sturges')
histogram(s, breaks=30)

## Categorical data
r <- raster(nrow=10, ncol=10)
r[] = 1
r[51:100] = 3
r[3:6, 1:5] = 5
r <- ratify(r)
     
rat <- levels(r)[[1]]
rat$landcover <- c('Pine', 'Oak', 'Meadow')
rat$class <- c('A1', 'B2', 'C3')
levels(r) <- rat

histogram(r)
histogram(r, att = "class")

## Not run: 
library(zoo)

dataURL <- "https://raw.github.com/oscarperpinan/bookvis/master/data/"

##Solar irradiation data from CMSAF http://dx.doi.org/10.5676/EUM_SAF_CM/RAD_MVIRI/V001
old <- setwd(tempdir())
download.file(paste0(dataURL, "SISmm2008_CMSAF.zip"),
   "SISmm2008_CMSAF.zip", method='wget')
unzip("SISmm2008_CMSAF.zip")

listFich <- dir(pattern='\\.nc')
stackSIS <- stack(listFich)
stackSIS <- stackSIS*24 ##from irradiance (W/m2) to irradiation Wh/m2

idx <- seq(as.Date('2008-01-15'), as.Date('2008-12-15'), 'month')

SISmm <- setZ(stackSIS, idx)
names(SISmm) <- month.abb

histogram(SISmm)
histogram(SISmm, FUN=as.yearqtr)

## With the formula interface you can create histograms for a set of variables
histogram(~ Jan + Dec, data=SISmm)
## Or use the coordinates for generating zonal histograms.
## For example, five histograms for each latitude zone  
histogram(~ Jan | cut(y, 5), data=SISmm)
## More sophisticated bands can be defined using the dirXY argument 
histogram(~ Jan | cut(dirXY, 5), dirXY = x^2 + y^2, data=SISmm)
 
setwd(old)

## End(Not run)

## Not run: 
##http://neo.sci.gsfc.nasa.gov/Search.html?group=64
pop <- raster('875430rgb-167772161.0.FLOAT.TIFF')
pop[pop==99999] <- NA
levelplot(pop, zscaleLog=10, par.settings=BTCTheme,
          panel=panel.levelplot.raster, interpolate=TRUE)

##http://neo.sci.gsfc.nasa.gov/Search.html?group=20
landClass <- raster('241243rgb-167772161.0.TIFF')
landClass[landClass==254] <- NA


s <- stack(pop, landClass)
names(s) <- c('pop', 'landClass')

histogram(~asinh(pop)|landClass, data=s,
            scales=list(relation='free'),
            strip=strip.custom(strip.levels=TRUE))

## End(Not run)

rasterVis documentation built on Nov. 2, 2023, 5:25 p.m.