University of Illinois

> online guides
  educational cd-rom
  current weather
  about ww2010

Online Guides
> remote sensing
  reading maps
  projects, activities

Remote Sensing
> satellites

  goes satellites
> poes satellites
  image interpretation

POES Satellites
> introduction
  dmsp poes
  noaa poes

User Interface
> text

NOTE: We've guessed that you're not using a client that supports colored tables and have tried to compensate. Low graphics mode looks much better on clients that do... we recommend switching to Netscape 3.0 or Microsoft Internet Explorer.
Polar Orbiting Satellites
the POES program

[Image: POES spacecraft (35K)] Polar Orbiting Environmental Satellites (POES) are placed in circular sun-synchronous (see below) orbits and their altitudes usually range from 700 to 800 kilometers, with orbital periods of 98 to 102 minutes.
Image provided by: National Climatic Data Center

POES satellites include: Defense Meteorological Satellite Program (DMSP), Landsat, SPOT and NOAA Polar-orbiting Operational Environmental Satellites (NPOES). The DMSP and NPOES satellites are operational meteorological satellites. Imagery from successive orbits overlay each other, providing global daily coverage from each satellite. Commercial polar orbiters like Landsat and SPOT, on the other hand, are intended for geophysical remote sensing, with an emphasis on high-resolution and multispectral imagery, at the cost of daily global coverage.

POES have meteorological and geophysical importance because of their high-resolution global coverage and well calibrated channels. They are designed to stay in a low earth orbit and reach high latitudes. The POES program began in 1960 with the launch of TIROS-1. Later satellites in the Improved TIROS Operational Satellite (ITOS) program were expanded to capture concurrent multiple-channel data on a daily basis.

[Image: (49K)]
Image provided by: Satellite Coverages and Orbits (NCAR)

The POES orbit (above) relative to the Earth's surface is sun-synchronous. Its track is due to a combination of the orbital plane of the satellite coupled with the rotation of the Earth beneath the satellite. The orbit is slightly tilted towards the northwest and does not actually go over the poles. The red path follows the earth track of the satellite, the transparent overlay indicates the coverage area for the Advanced Very High Resolution Radiometer (AVHRR) imaging instrument carried by NOAA/POES satellites. This instrument scans a swath roughly 3000 kilometers wide.

Text Provided By: Satellite Coverages and Orbits (NCAR)

GOES Satellites
Terms for using data resources. CD-ROM available.
Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.

dmsp poes