Functions by Category

MEALPix Toolbox Version 3.0 21 February 2011

Contents

Coordinate Conversions
Coordinate-Pixel Conversions
Functions on the sphere
Map Statistics
Pixel Indexing Conversions
Pixel Topology
Plotting
Resolution Relations

Coordinate Conversions

ang2vec - Convert from spherical to cartesian coordinates
vec2ang - Convert cartesian direction vector to position angle on sphere

Coordinate-Pixel Conversions

ang2pix - Convert spherical coordinate location to HEALPix pixel number
pix2ang - Find spherical coordinate location of HEALPix pixels
pix2vec - Convert HEALPix pixel numbers to (x,y,z) unit vector
ring2z - Find HEALPix ring number corresponding to a given z coordinate
vec2pix - Convert cartesian direction vectors to MEALPix pixel numbers
z2ring - Find HEALPix ring numbers from direction vector z coordinate

Functions on the sphere

alm2pix - Evaluate spherical harmonic function expansion on HEALPix pixels
angDist - Computes angular distance on the unit sphere
pix2alm - Find spherical harmonic decomposition of function on sphere
ylm - returns spherical harmonic basis on the HEALPix sphere

Map Statistics

alm2spec - valuate angular power spectral density
hpStat - Compute descriptive statistics of a pixel value list

Pixel Indexing Conversions

nest2ring - Convert MEALPix pixel numbers from nest to ring indexing
ring2nest - Convert MEALPix pixel numbers from ring to nest indexing

Pixel Topology

corners - Find pixel corners
inRing - return pixels in ring or ring section
pix2xy - Find pixel cartesian face coordinates
queryDisc - Find all pixels whose centers are within a specified disc
xy2pix - gives the pixel number ipix (NESTED) of ix, iy and face_num

Plotting

hp3d - Plots a HEALPix dataset on a 3D sphere

Resolution Relations

nPix2nSide - Convert number of pixels to number of facet side subdivisions
nSide2nPix - Convert resolution parameter to number of pixels
nSide2res - Calculates angular resolution of a HEALPix map in arcsec
res2nSide - Finds minimum base pixel sub-division for required resolution

Copyright 2010-2011 Lee Samuel Finn. Terms of Use.