Ice monitoring of the Great Lakes
ERS-1 SAR image of southern Lake Michigan (March 2, 1994) shows the details
of the ice conditions during winter time. This is an area of considerable ship
traffic, and accurate ice maps are useful for the traffic planning. The image
was received at the National Ice Center (NIC) in Washington, D.C. from the Gatineau
ground station via the North American Ice Link.
The NIC produces a complete analysis of ice conditions in the Great Lakes three
times a week. In previous years, the best routinely available data source was
one kilometer resolution visible and infrared imagery from the Advanced Very
High Resolution Radiometer (AVHRR) instrument aboard the NOAA TIROS satellites.
The routine availability of 100 meter resolution imagery that is not cloud limited
has greatly improved the quality of the Great Lakes analyses.
The image shown here was annotated using World Meteorological Organization standard
codes for ice concentration and ice type in a manner typical to that used by
NIC analysts on a daily basis.
(Courtesy: C. Bertoia, National Ice Center, USA)
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,