Utilities

The simulator utility module consists of miscellaneous utility routines intended to be of broad use. Present examples include:

• turning astropy coordinates into galsim coordinates and vice-versa

• making an RGB image from image slices

• generating points at random in a region on the sky

romanisim.util Module

Miscellaneous utility routines.

Functions

skycoord(celestial)	Turn a CelestialCoord into a SkyCoord.
celestialcoord(sky)	Turn a SkyCoord into a CelestialCoord.
scalergb(rgb[, scales, gray])	Scales three flux images into an RGB image for displaying.
random_points_in_cap(coord, radius, nobj[, rng])	Choose locations at random within radius of coord.
random_points_in_king(coord, rc, rt, nobj[, rng])	Sample points from a King distribution
random_points_at_radii(coord, radii[, rng])	Choose locations at random at given radii from coord.
add_more_metadata(metadata[, usecrds])	Fill out the metadata dictionary, modifying it in place.
update_pointing_and_wcsinfo_metadata(...)	Update pointing and wcsinfo keywords to use the aperture for this SCA.
king_profile(r, rc, rt)	Compute the King profile.
sample_king_distances(rc, rt, npts[, rng])	Sample distances from a King profile.
decode_context_times(context, exptimes)	Get 0-based indices of input images that contributed to (resampled) output pixel with coordinates x and y.
default_image_meta([time, ma_table, ...])	Return some simple default metadata for input to image.simulate
update_photom_keywords(im[, gain])	Add photometry calibration keywords to image metadata.
merge_dicts(a, b)	Merge two dictionaries, replacing values in a with values in b.
calc_scale_factor(date, ra, dec)	Calculate velocity aberration scale factor