Struct CubeMeta 

pub struct CubeMeta {
    pub path: PathBuf,
    pub nx: usize,
    pub ny: usize,
    pub nfreq: usize,
    pub nstokes: usize,
    pub dx_deg: f64,
    pub dy_deg: f64,
    pub crpix_freq: i64,
    pub beams: Vec<Option<Beam>>,
    pub is_4d: bool,
    pub unit: BrightnessUnit,
    pub dtype: PixelType,
}

Metadata for a FITS spectral cube (3D or 4D).

Fields

path: PathBuf

nx: usize

Fastest-varying spatial axis size (RA/x pixels).

ny: usize

Slower spatial axis size (Dec/y pixels).

nfreq: usize

Number of frequency channels.

nstokes: usize

Number of Stokes planes (1 for most ASKAP data).

dx_deg: f64

|CDELT1| in degrees.

dy_deg: f64

|CDELT2| in degrees.

crpix_freq: i64

FITS 1-based CRPIX for the spectral axis (used as the header reference channel).

beams: Vec<Option<Beam>>

Per-channel beams. None means the channel is masked / has no valid beam.

is_4d: bool

True for 4D input (has a Stokes axis in the header).

unit: BrightnessUnit

Brightness unit from BUNIT (defaults to Jy/beam if absent).

dtype: PixelType

Working pixel precision, derived from FITS BITPIX.

Implementations

impl CubeMeta

pub fn channel_range(&self, chan: usize) -> (usize, usize)

Flat element range [start, end) of frequency channel chan (Stokes 0) in the primary data unit. For 3D [nfreq, ny, nx] and 4D [nstokes=1, nfreq, ny, nx] cubes the offset is chan * ny * nx.

pub fn beamlog_path(&self) -> PathBuf

Beamlog path co-located with the FITS file.

Trait Implementations

impl Debug for CubeMeta

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.