Instrument : Total Sky Imager (TSI)

Instrument Categories
Cloud Properties

Picture of the Total Sky Imager (TSI)

General Overview

The total sky imager (TSI) provides time series of hemispheric sky images during daylight hours and
retrievals of fractional sky cover for periods when the solar elevation is greater than 10 degrees. To view current sky cover retrievals at the ARM sites, see the TSI most recent sky images.

Output Datastreams

  • tsicldmask : Total Sky Imager (TSI): cloud decision images, PNG format
  • tsimovie : Total Sky Imager (TSI): daily movie generated from 30-sec sky image
  • tsiskycover : Total Sky Imager (TSI): fractional sky coverage
  • tsiskyimage : Total Sky Imager (TSI): sky image (JPEG)

Primary Measurements

The following measurements are those considered scientifically relevant.


Eastern North Atlantic
ENAC1 Browse Data Browse PlotsGraciosa Island, Azores, Portugal
North Slope Alaska
NSAC1 Browse DataCentral Facility, Barrow AK
NSAX1 Browse DataExternal Data (satellites and others)
Southern Great Plains
SGPC1 Browse Data Browse PlotsCentral Facility, Lamont, OK
Tropical Western Pacific
TWPC1 Browse Data Browse PlotsCentral Facility, Manus I., PNG retired
TWPC2 Browse Data Browse PlotsCentral Facility, Nauru Island retired
TWPC3 Browse Data Browse PlotsCentral Facility, Darwin, Australia retired
ARM Mobile Facility
ACXM1 Browse DataOff the Coast of California - NOAA Ship Ronald H. Brown; AMF2
FKBM1 Browse Data Browse PlotsBlack Forest, Germany retired
GANM1 Browse Data Browse PlotsGan Airport, Gan Island, Maldives retired
GRWM1 Browse Data Browse PlotsGraciosa Island, Azores, Portugal retired
HFEM1 Browse Data Browse PlotsShouxian, Anhui, China retired
MAGM1 Browse Data Browse PlotsLos Angeles, CA to Honolulu, HI - container ship Horizon Spirit; AMF2 retired
MAOM1 Browse DataManacapuru, Amazonas, Brazil; AMF1
NIMM1 Browse Data Browse PlotsNiamey, Niger retired
OLIM1 Browse Data Browse PlotsOliktok Point, Alaska
PGHM1 Browse DataARIES Observatory, Nainital, Uttarkhand, India retired
PVCM1 Browse Data Browse PlotsHighland Center, Cape Cod MA; AMF 1 retired
PYEM1 Browse Data Browse PlotsPoint Reyes, CA retired
SBSM1 Browse Data Browse PlotsSteamboat Springs CO, Valley Site retired
TMPM1 Browse Data Browse PlotsU. of Helsinki Research Station (SMEAR II), Hyytiala, Finland; AMF2
 retired = Originating instrument has been retired at this location


Victor Morris
Pacific Northwest National Laboratory
(509) 372-6144