ARM-DOE/pyart — pull request #175 by kirknorth (2014-06-26 04:08:51+00:00)
Title: ENH: extra volume preparation

Adding the ability to remove poor gates based on the normalized coherent power and cross correlation ratio fields, assuming `prep = 1`. This is added (quite easily) using an additional kwarg called `extra_prep`. This should further help the 4DD algorithm by removing noise from the receiver and second-trip echoes. I decided to add this feature as I noticed the `lowdbz` and `highdbz` thresholds for the reflectivity field were not adequately removing enough bad gates, especially those representing second-trip echoes.