geoArea.CMBDataFrame: Geodesic area covered by a 'CMBDataFrame'

In frycast/rcosmo: Cosmic Microwave Background Data Analysis

Geodesic area covered by a CMBDataFrame

Description

Gives the surface on the unit sphere that is encompassed by all pixels in cmbdf

Usage

## S3 method for class 'CMBDataFrame'
geoArea(x)

Arguments

x	a CMBDataFrame.

Value

The sum of the areas of all pixels (rows) in x.

Examples

## At low resolution, a few data points can
## occupy a large pixel area, e.g.:

cmbdf <- CMBDataFrame(nside = 1, spix = c(1,2,3))
pix(cmbdf)

## The total number of Healpix points at nside=1 equals 12. As cmbdf has 3 Healpix
## it occupies pi = 1/4*(surface area of unit sphere)

geoArea(cmbdf)
plot(cmbdf, size = 5, hp.boundaries = 1)

frycast/rcosmo documentation built on Oct. 11, 2022, 5:21 p.m.