Skip to data content Skip to data search




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 ┬Ám. This dataset contains CPI roi images collected by the 3V-CPI aboard the NCAR GV (HIAPER) during the DC3 project.

For all of the flights, the CPI makes as many *.roi files as it needs; each file can be maximum 92Mb size and then a new file is opened.

Data access

  • ORDER data for delivery by FTP

Additional information

Data Quality final
  • 1.0 (2013-03-01)
Subscribe Subscribe to receive email when new or updated data is available.
Related projects
Spatial Type raster
Frequency continuous
Language English
GCMD Science Keywords Expand keywords
Related links

Temporal coverage

Begin datetime 2012-04-24 00:00:00
End datetime 2012-07-01 01:32:59

Spatial coverage

Map data from IBCSO, IBCAO, and Global Topography.

Maximum (North) Latitude: 42.06574, Minimum (South) Latitude: 24.96023
Minimum (West) Longitude: -106.76535, Maximum (East) Longitude: -84.94339

Primary point of contact information

EOL Data Support <>

Additional contact information


UCAR/NCAR - Earth Observing Laboratory, Rogers, D. 2013. NSF/NCAR GV (HIAPER) 3V-CPI Raw CPI ROI Imagery. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. Accessed 25 Jul 2024.

Today's date is shown: please replace with the date of your most recent access.

Additional citation styles

The citation text below is from the DataCite Content Resolver service and may take a few seconds to load. The styles and locales are obtained from CrossCite, which also provides a citation formatter. See ReFindit for another alternative. Formatting is not perfect: please verify and edit before use. Today's date is shown: please replace with the date of your most recent access.

Style: Locale:

Ancillary information

Metadata download

Note that your browser may not display the above metadata links, but automatically save them as files in a folder such as "Downloads"