Atmospheric Radiation Measurement Climate Research Facility US Department of Energy

mascparticles > Multi-Angle Snowflake Camera Particle AnalysisVAP Type(s) > Baseline

The MASC generates a collection of data for every detected particle. The MASCPARTICLES VAP uses these values as input to derive variables it reports. The VAP produces two datastream files per day.

At the very first stage, the VAP checks whether input is appropriate. If the fallspeed is determined to be too fast (valid_max), the appropriate quality bit is set for all data for this particle. If either camera index is set to MISSING_VALUE or the image cannot be found, the analysis data for this image are set to MISSING_VALUE (and appropriate quality bits are set). If, for the particle, all camera indexes or images are missing or no images were used to compute per-particle average, then the particle averages are set to MISSING_VALUE (and appropriate quality bits are set).

This VAP relies on OpenCV for image processing.


  • Fixed
  • AMF1
  • AMF2
  • AMF3


masc: Multi-Angle Snowflake Camera

Active Locations

Facility Name Start Date
Central Facility, Barrow AK 2021-04-27


Cooper SJ, NB Wood, and TS L'Ecuyer. 2017. "A variational technique to estimate snowfall rate from coincident radar, snowflake, and fall-speed observations." Atmospheric Measurement Techniques, 10(7), 10.5194/amt-10-2557-2017.


Shkurko K, T Garrett, A Talaei, and K Gaustad. 2016. Multi-Angle Snowflake Camera Particle Analysis Value-Added Product. Ed. by Robert Stafford, DOE ARM Climate Research Facility. DOE/SC-ARM-TR-187.

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Krista Gaustad
Pacific Northwest National Laboratory

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