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The whole-sky imager (WSI) is an automated imager used for assessing and documenting cloud fields and cloud field dynamics. The WSI is a ground-based electronic imaging system that monitors the upper hemisphere. It is a passive, i.e., non-emissive, system that acquires images of the sky dome through three spectral filters (neutral, red, and blue).

From these sky images, we can assess the presence, distribution, shape, and radiance of clouds over the entire sky using automated cloud decision algorithms and related processing. The current WSI model (EO System 6) is capable of image acquisition under daylight, moonlight, and starlight conditions.

WSI stationary calibrated red or clear quicklook images (JPEG), 10 min intervals

North Slope Alaska

• Latitude: 71.323
• Longitude: -156.609
• Publication Date: 1998-12-01
• Start Date: 1998-12-01
• End Date: 2001-09-10
• Last Updated: 2002-03-06

https://www.arm.gov/connect-with-arm/organization/instrument-mentors/list#wsi

Adam Theisen

Argonne National Laboratory

http://dx.doi.org/10.5439/1025029
Atmospheric Radiation Measurement (ARM) user facility. 1998, updated hourly. Whole Sky Imager (10WSIPARTRADJPG). 1998-12-01 to 2001-09-10, North Slope Alaska (NSA) Central Facility, Barrow AK (C1). Compiled by A. Theisen. ARM Data Center. Data set accessed at http://dx.doi.org/10.5439/1025029.