Stereophotogrammetry of oceanic clouds

Rusen Öktem, Prabhat, James Lee, Aaron Thomas, Paquita Zuidema, David M. Romps

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

This study extends ground-based stereophotogrammetry of clouds to oceanic settings, where there are often none of the landmarks used in traditional camera calibration. This paper introduces a zero-landmark calibration technique and tests it with two off-the-shelf digital cameras situated about 1 km apart facing Biscayne Bay in Miami, Florida. The precision of the stereo reconstruction is studied theoretically, and the accuracy of the reconstructions is validated against lidar and radiosondes. The stereo cameras are able to accurately reconstruct a histogram of cloud-base heights from a single-image pair, a task that requires tens of minutes of observation from a cloud lidar. The stereo cameras are also able to accurately reconstruct horizontal winds in cloud layers with a temporal resolution in the range of 30 s to 5 min, compared to once every 12 h for a typical radiosonde launch site.

Original languageEnglish (US)
Pages (from-to)1482-1501
Number of pages20
JournalJournal of Atmospheric and Oceanic Technology
Volume31
Issue number7
DOIs
StatePublished - Jul 2014

Keywords

  • Cloud tracking/cloud motion winds
  • Clouds
  • Convective clouds
  • Cumulus clouds

ASJC Scopus subject areas

  • Ocean Engineering
  • Atmospheric Science

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