chandra_aca.aca_image.get_ccd_quadrant

chandra_aca.aca_image.get_ccd_quadrant(row, col, pix_zero_loc='center')

Get CCD quadrant for given row and column.

For row and col values in the “edge” coordinate system where the center of the CCD is at exactly (0.0, 0.0), the quadrants are defined as follows:

• a: row < 0 and col >= 0

• b: row < 0 and col < 0

• c: row >= 0 and col >= 0

• d: row >= 0 and col < 0

Parameters:

rowfloat, np.ndarray[float]

Row value(s) of pixel(s)

colfloat, np.ndarray[float]

Column value(s) of pixel(s)

pix_zero_locstr

Location of pixel zero, either ‘center’ or ‘edge’. Default is ‘center’.

Returns:

quadrantstr or np.ndarray[str]

CCD quadrant (‘a’, ‘b’, ‘c’, or ‘d’) for each input row and column value. If input row and col are scalars, returns a single string. If input row and col are arrays, returns an array of strings with the same shape as the broadcasted shape of row and col.