| Type | Description |
|---|
tessellation{T} | Base tessellation on unit sphere: npix, unit_xyz (npix,5,3), unit_spherical (npix,5,3), tessellation_type (0=HEALPix, 1=lon/lat) |
stellar_geometry{T} | Rotated/projected geometry for one epoch: vertices, normals, visibility mask, projwest/projnorth, polyflux, polyft, epoch time t |
| Function | Description |
|---|
tessellation_healpix(n; T=Float32) | Create HEALPix tessellation with nside=2^n, npix=12*nside^2 |
nside2npix(nside) | Convert nside to number of pixels |
npix2n(npix) | Convert npix to resolution parameter n |
tv_neighbors_healpix(n; T=Float32) | Sparse difference matrix and Hessian for TV regularization |
tv_neighbors_healpix_visible(n, stars; T=Float32) | TV neighbors excluding always-invisible pixels |
upsample_map_stars(tmap, stars, star_params, tepochs) | Double resolution (each pixel splits into 4) |
downsample_map_stars(tmap, stars, star_params, tepochs) | Halve resolution (average groups of 4) |
These work with any tessellation type (HEALPix or lon/lat) via stellar_geometry. Spots use Euclidean chord distance in 3D, so they remain circular on non-spherical surfaces.
| Function | Description |
|---|
make_circ_spot(tmap, star_geom, radius, lat, lon; bright_frac) | Create circular temperature spot on any surface |
make_circ_spot_spotfill(star_geom, radius, lat, lon; profile) | Spot fill-fraction map ("flat" or "linear" profile) |
make_meridional_band(tmap, star_geom, width, lon; bright_frac) | Meridional (N-S) temperature band |
make_equatorial_band(tmap, star_geom, width, lat; bright_frac) | Equatorial (E-W) temperature band |
| Function | Description |
|---|
tessellation_latlong(ntheta, nphi; T=Float32) | Create regular lat/lon grid with ntheta rings of nphi pixels |
tv_neighbors_longlat(ntheta, nphi) | TV neighbor structure for lat/lon grid |
make_circ_spot(tmap, ntheta, nphi, radius, lat, lon; bright_frac) | Create circular spot (pixel-index based, lon/lat only) |
make_spot_move(tmap, ntheta, nphi, period, B_rot, tepochs) | Move spot in longitude with differential rotation |
| Function | Description |
|---|
pix2ang_nest(nside, ipix) | Pixel index to (colatitude, longitude) |
pix2vec_nest(nside, ipix) | Pixel index to 3D unit vectors (center + 4 vertices) |
ang2pix_nest(nside, theta, phi) | (colatitude, longitude) to pixel index |
vec2ang(vector) | 3D vector to (colatitude, longitude) |
neighbors_nest(nside, ipix) | Find 8 neighbors of a pixel in nested scheme |
all_neighbors_nest(n) | Neighbors for all pixels |