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 DataCentral Facility, Lamont, OK
SGPS01 Browse DataSupplemental 1, Lamont, OK
Tropical Western Pacific
TWPC1 Browse DataCentral Facility, Manus I., PNG retired
TWPC2 Browse DataCentral Facility, Nauru Island retired
TWPC3 Browse DataCentral Facility, Darwin, Australia retired
ARM Mobile Facility
ACXM1 Browse DataOff the Coast of California - NOAA Ship Ronald H. Brown; AMF2
ASIM1 Browse DataAscension Island, South Atlantic Ocean; AMF1
AWRM1 Browse Data Browse PlotsMcMurdo Station Ross Ice Shelf, Antarctica; AMF2
FKBM1 Browse DataBlack Forest, Germany retired
GANM1 Browse DataGan Airport, Gan Island, Maldives; AMF2 retired
GRWM1 Browse DataGraciosa Island, Azores, Portugal; AMF1 retired
HFEM1 Browse DataShouxian, Anhui, China retired
MAGM1 Browse Data Browse PlotsLos Angeles, CA to Honolulu, HI - container ship Horizon Spirit; AMF2 retired
MAOM1 Browse Data Browse PlotsManacapuru, Amazonas, Brazil; AMF1
NIMM1 Browse Data Browse PlotsNiamey, Niger retired
OLIM1 Browse Data Browse PlotsOlikiok Point, Alaska; AMF3
PGHM1 Browse Data Browse PlotsARIES Observatory, Nainital, Uttarkhand, India; AMF1 retired
PVCM1 Browse DataHighland Center, Cape Cod MA; AMF1 retired
PYEM1 Browse DataPoint Reyes, CA retired
SBSM1 Browse DataSteamboat Springs CO, Valley Site; AMF2 retired
TMPM1 Browse DataU. 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