pstack
wfc3tools.pstack Module
Plot the stack of MultiAccum sample values for a specified pixel in an IR multiaccum image. Pixels from any of the SCI, ERR, DQ, or TIME image extensions can be plotted. The total number of samples is determined from the primary header keyword NSAMP and all samples (excluding the zeroth read) are plotted. The SCI, ERR, DQ, values are plotted as a function of sample time, while TIME values are plotted as a function of sample number. The sample times are read from the SAMPTIME keyword in the SCI header for each readout. If any of the ERR, DQ, SAMP, or TIME extensions have null data arrays, the value of the PIXVALUE extension header keyword is substituted for the pixel values. The plotted data values can be saved to an output text table or printed to the terminal.
The BUNIT keyword value is used to determine the starting units of the data,
but you can plot either counts or rate using the optional keyword units.
>>> from wfc3tools import pstack
>>> xdata, ydata = pstack(
... 'ibh719grq_ima.fits', column=100, row=25, extname='sci')
>>> xdata
array([ 100.651947, 93.470573, 86.2892 , 79.107826, 71.926453,
64.745079, 57.563702, 50.382328, 43.200954, 36.019581,
28.838205, 21.65683 , 14.475455, 7.29408 , 0.112705,
0. ])
>>> ydata
array([ 136.75660802, 151.46077054, 133.8688648 , 108.50410805,
109.17918583, 81.5139582 , 90.26712192, 61.68512157,
59.11241987, 39.01870227, 32.63157047, 16.07532735,
33.69198196, 16.90631634, 13.54113704, 0. ])
Warning
Note that the arrays are structured in SCI order, so the final exposure is the first element in the array.
Functions
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A function to plot the statistics of one pixels up the IR ramp image. |