use DBSCAN to find molecular clouds and extract catalog

Most of the files are useless and they are copied here only to make the script runable.

Author : Qing-Zeng Yan

Paper Link: https://ui.adsabs.harvard.edu/abs/2020arXiv200613654Y

example.py

Please make sure the example.py file run correctly

You may need to install lots of python packages.

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Cloud Table colnames: "_idx": index of clouds

"area_exact": Area of cloud

"v_cen": average radial veloicty, km/s

"v_rms": weighted (by temperature) standard deviation of velocity, km/s

"x_cen": average Galactic longitude in degree

"l_rms": same as "v_rms" but for the Galadctic longtitude in degree

"y_cen": average Galactic latitude in degree

"b_rms": same as "v_rms" but for the Galadctic latitude in degree

"sum": sum of voxel values in Kelvin

"pixN": total number of voxels

"peak": Peak value of clouds

"peakL": Index of peak in PPV

"peakB": Index of peak in PPV

"peakV": Index of peak in PPV

"area_accurate": Exact area of cloud (considering the factor of cos(b), current not calculated for the speed purpose)

"allChannel": total number of channels

"hass22": has a 2x2 compact region (a beam)