<jupyter_start><jupyter_text>To get azimuth, elevation per pixel, include the optional second argument to du.load(). The azimuth, elevation data is not validated or checked.If the calibration data is from a different camera or camera position, the azimuth, elevation data will be incorrect.The quirk about specifying the filename cal_stem is that azimuth,elevation data are given as two files.The stem is the common part of the fullpath to these files.<jupyter_code>data_dir = "../src/dascutils/tests/data"
cal_stem = "../src/dascutils/cal/PKR_DASC_20110112"

imgs = du.load(data_dir, cal_stem)<jupyter_output><empty_output><jupyter_text>If you omit "cal_stem", `imgs` will not have "az,el" keys<jupyter_code>print(imgs.keys())
dup.contour_azel(imgs, cal_stem)
show()<jupyter_output><empty_output>
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