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NSF/NCAR C-130 3V-CPI Raw 2D-S Imagery (RAF OAP .2d format)



The Three-View Cloud Particle Imager (3V-CPI) is a combination of three imaging instruments. Two of them comprise a 2D-S instrument, in which two 2D probes image particles as they pass through beams that are oriented orthogonally to each other and the airflow. If particles also lie in the intersection of the sensitive areas of the two beams, they are seen by both 2D probes. In that case, the CPI is triggered to take a high-resolution picture, via a briefly illuminated high-resolution imaging array, to provide a third image at high resolution. The probe is particularly suited to imaging ice crystals, but also provide good detection of other hydrometeors including large cloud droplets, drizzle and small rain drops, and precipitation particles. The 3V-CPI measures the size, shape and concentration of water drops and ice particles in clouds in the size range of 15-250 micrometers. This dataset contains 2D-S imagery collected by the 3V-CPI aboard the NSF/NCAR C130 during the IDEAS-4 C130 project. These data have been converted to a format compatible with xpms2d, available from the EOL xpms2d download page.

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Additional information

Data Quality final
  • 1.0 (2018-06-27)
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Related projects
Spatial Type raster
Frequency continuous
Language English
GCMD Science Keywords Expand keywords
Related links

Temporal coverage

Begin datetime 2011-11-01 14:35:10
End datetime 2011-11-16 03:26:04

Spatial coverage

Map data from IBCSO, IBCAO, and Global Topography.

Maximum (North) Latitude: 45.00, Minimum (South) Latitude: 40.00
Minimum (West) Longitude: -106.00, Maximum (East) Longitude: -100.00

Primary point of contact information

EOL Data Support <>

Additional contact information


Example citation following ESIP guidelines:

UCAR/NCAR - Earth Observing Laboratory. 2018. NSF/NCAR C-130 3V-CPI Raw 2D-S Imagery. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. Accessed 29 Sep 2023.

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