Release 0.2.1: cs_util.size#67
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skyproj not optional
…FWHM)
Single source of truth for the size conversions used across the
UNIONS / ShapePipe stack, so producers (ShapePipe ngmix writer) and
consumers (sp_validation) stop re-deriving the factors locally:
T = 2 sigma^2 (ngmix / DES area parameter)
r50 = sqrt(2 ln 2) sigma (half-light radius, the primary size in
the UNIONS shape-catalogue papers)
FWHM = 2 sqrt(2 ln 2) sigma
Primitives (T <-> sigma, sigma <-> r50, sigma <-> fwhm) plus the
composites consumers actually call (T_to_r50, r50_to_T, T_to_fwhm).
T_to_fwhm in particular replaces a dimensionally wrong local version in
sp_validation (T / 1.17741 * 2.355, which treats the area T as if it
were already sigma); here the area-to-length conversion carries the
required square root.
Constants are exact (sqrt(2 ln 2), 2 sqrt(2 ln 2)) rather than the
truncated 1.1774 / 2.355 literals. Tests cover closed forms, unit-sigma
values, round trips, FWHM = 2 r50, and array input.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
feat: size module — Gaussian size-conversion web (T, sigma, r50, FWHM)
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
chore: bump version to 0.2.1
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Brings
developintomainfor the 0.2.1 release: the newcs_util.sizemodule (#65) plus the version bump (#66). Taggingv0.2.1after merge triggers the PyPI publish workflow.— Claude on behalf of Cail