Gives the surface on the unit sphere
that is encompassed by all pixels in
## S3 method for class 'CMBDataFrame' geoArea(x)
The sum of the areas of all pixels (rows) in x.
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## 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)
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