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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

Data Details

Contact Scott Collis
Resource(s) Data Directory
Content time range 14 April 2011 - 29 June 2011


Sherman Z, S Collis, and J Hemedinger. 2020. Mapped Moments to a Cartesian Grid (MMCG) Value-Added Product Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-TR-243.


van Lier-Walqui M, AM Fridlind, AS Ackerman, S Collis, J Helmus, DR MacGorman, K North, P Kollias, and DJ Posselt. 2016. "On polarimetric radar signatures of deep convection for model evaluation: Columns of specific differential phase observed during MC3E." Monthly Weather Review, 144(2), 10.1175/mwr-d-15-0100.1.
Research Highlight


Kumjian MR and OP Prat. 2014. "The Impact of Raindrop Collisional Processes on the Polarimetric Radar Variables." Journal of the Atmospheric Sciences, 71(8), 10.1175/jas-d-13-0357.1.
Research Highlight


Sivaraman S. 2013. ARM Climate Research Facility Quarterly Value-Added Product Report January 1–March 31, 2013. Ed. by U.S. Department of Energy, DOE/SC-ARM-13-010.

Collis S, S Giangrande, J Helmus, A Theisen, N Bharadwaj, K Widener, M Dunn, and K North. 2013. Value-adding the ARM Precipitation Radars. Presented at 4th Atmospheric System Research (ASR) Science Team Meeting. Potomac, MD.

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Scott Collis
Argonne National Laboratory

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