morphfits.utils.science#
Science utility functions for MorphFITS.
Functions#
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Get a resolution name from its corresponding scale. |
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Get a resolution scale from its corresponding name. |
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TODO May be deleted. Check if unused. |
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Get a FICL's pixscale from its science frame. |
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Calculate image zeropoint in passed magnitude system. |
Module Contents#
- morphfits.utils.science.get_pixname_from_scale(pixscale: float) str#
Get a resolution name from its corresponding scale.
- Parameters:
pixscale (float) – Pixel scale.
- Returns:
Pixel scale as human-readable text.
- Return type:
str
- morphfits.utils.science.get_pixscale_from_name(pixname: str) float#
Get a resolution scale from its corresponding name.
- Parameters:
pixname (str) – Pixel scale as text.
- Returns:
Corresponding pixel scale.
- Return type:
float
- morphfits.utils.science.get_pixels_from_skycoord(skycoord: astropy.coordinates.SkyCoord, wcs: astropy.wcs.WCS, image_size: int) tuple[tuple[int, int], tuple[int, int]]#
TODO May be deleted. Check if unused.
Calculate corresponding pixels in an image based on sky coordinates and a WCS.
- Parameters:
skycoord (SkyCoord) – Position of object in sky.
wcs (WCS) – Coordinate system from pixel to sky.
image_size (int) – Number of pixels along one square image side.
- Returns:
Integer pixel coordinates in order of less x, greater x, less y, greater y.
- Return type:
tuple[tuple[int, int], tuple[int, int]]
- morphfits.utils.science.get_pixscale(science_path: pathlib.Path)#
Get a FICL’s pixscale from its science frame.
Used because not every frame has the same pixel scale. For the most part, long wavelength filtered observations have scales of 0.04 “/pix, and short wavelength filters have scales of 0.02 “/pix.
- Parameters:
science_path (Path) – Path to science frame.
- Raises:
KeyError – Coordinate transformation matrix element headers missing from frame.
- morphfits.utils.science.get_zeropoint(image_path: str | pathlib.Path, magnitude_system: str = 'AB') float#
Calculate image zeropoint in passed magnitude system.
- Parameters:
image_path (str | Path) – Path to image FITS file.
magnitude_system (str, optional) – Magnitude system to calculate zeropoint from, by default “AB”.
- Returns:
Zeropoint of image.
- Return type:
float
- Raises:
NotImplementedError – Magnitude system unknown.
Notes
Image header must contain keys PHOTFLAM and PHOTPLAM.
References