auromat.coordinates.wcs module

auromat.coordinates.wcs.pix2world(wcsHeader, width, height, startX=0, startY=0, corner=True, ascartesian=False)

Calculate RA, Dec coordinates of a given pixel coordinate rectangle.

ra, dec = pix2world(..) ra and dec are indexed as [y,x]

Each array element contains the RA,Dec coords of the top left corner of the given pixel if corner==True, otherwise the coords of the pixel center. If corner==True, an additional row and column exists at the bottom and right so that it is possible to get the bottom and right corner values for those pixels.

Parameters:

• wcsHeader (dictionary) – WCS header
• width – width of rectangle
• height – height of rectangle
• startX – x coordinate of rectangle, can be negative
• startY – y coordinate of rectangle, can be negative

If ascartesian=False:

Return type:tuple(ra, dec) with arrays of shape (height+1,width+1) if corner==True, else (height,width)

If ascartesian=True:

Return type:array of shape (height[+1],width[+1],3) with x,y,z order

auromat.coordinates.wcs.tan_pix2world(header, px, py, origin, ascartesian=False)

Fast reimplementation of astropy.wcs.wcs.wcs_pix2world with support for only the TAN projection. Speedup is about 2x.

Return type:tuple (ra,dec) in degrees, or cartesian coordinates in one array (h,w,3) if ascartesian=True