cmac > Corrected Radar Moments in Antenna CoordinatesVAP Type(s) > Baseline • Evaluation

Raw moments from the scanning ARM precipitation radars (SAPRs) are subject to a number of instrumental and atmospheric phenomena that must be retrieved and corrected for. The Corrected Moments in Antenna Coordinates (CMAC) value-added product contains both raw data and fields that have been processed to:

  • correct for velocity aliasing
  • unfold and generate a cross-polarimetric phase difference that is monotonically increasing, removing impulses caused by non-uniform beam filling and phase shift on backscatter
  • recalculate specific differential phase using a 20-point Sobel filter on the aforementioned phase
  • correct for liquid path attenuation using the polarimetric signals
  • estimate rainfall rates at the gate using the specific attenuation.

In addition, CMAC writes the data out into a community-standard-format netCDF file using the CF/Radial conventions. The data are therefore compatible with new and existing National Center for Atmospheric Research (NCAR) tools, such as RadxConvert for converting to a variety of popular file formats.


  • Fixed
  • AMF1
  • AMF2
  • AMF3