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Archived Content

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Archived - SeaWiFS Satellite Images

The on-line archive contains five images for each SeaWiFS pass which is received in an encrypted format. The decryption key is provided to the IOS receiving station with a three week delay.  All decrypted data are stored on CD. Reasonably cloud free scenes are selected and processed using NASA's SeaDAS software. An IDL procedure is used to extract the desired products and convert the raw data to geophysical values, from which the five images for each SeaWiFS scene are produced:
  1. Water leaving radiance at 443 nm (L443)
  2. Water leaving radiance at 490 nm (L490)
  3. Water leaving radiance at 555 nm (L555)
  4. Chlorophyll A concentration (chlo)
  5. A set of diagnostic flags.  The cloud and land masks in all the images are derived from the flag dataset.

Examples of SEAWIFS images 

Some examples of SeaWifs images are provided below. Many more are available in our on-line archive.
thermalcolorbar.jpg (26257 bytes)

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bright

 Seawifs Water leaving radiance at 555 nm Anchorage, Alaska on March 1,1998 at 22:39 UTC . An199803012239_L555_seaw.jpg
Water leaving radiance at 555 nm.
Anchorage, Alaska on March 1,1998 at 22:39 UTC.
SeaWifs Water leaving radiance at 490 nm Anchorage, Alaska on August 14,1998 at 22:56 UTC . An199808142256_L490_seaw.jpg
Water leaving radiance at 490 nm.
Anchorage, Alaska on August 14,1998 at 22:56 UTC.
SeaWifs Water leaving radiance at 490 nm Vancouver Island on May 28, 1998 at 20:38 UTC . VI199805282038_L490_seaw.jpg
Water leaving radiance at 490 nm.
Vancouver Island on May 28, 1998 at 20:38 UTC.
SeaWifs Chlorophyll A concentration Vancouver Island on June 26, 2000 at  22:27 UTC . VI200006262227_chlo_seaw.jpg
Chlorophyll A concentration
Vancouver Island on June 26, 2000 at 22:27 UTC.
Seawifs Bering Sea on September 16,2000. beringsea.jpg
The Seawifs scanner is designed to image ocean colour patterns. The instrument has higher sensitivity and more spectral bands than the AVHRR.  Bands in blue (443 nm), green (555 nm) and red (670 nm) light have been combined to show the colours of blooms in the following three images. (not available in the archive)
Bering Sea on September 16,2000.
 Seawifs Vancouver Island on May 28,1998 vancouverisl.jpg
Vancouver Island on May 28,1998
(not available in the archive)
 SeaWifs Lake Michigan on September 28,2000 michigan.jpg
A bright patch in Lake Michigan may be due to phytoplankton or water chemistry. All three pictures were collected by the receiver at IOS, with the Bering Sea and Lake Michigan scenes at the west and east limits of reception. (not available in the archive)
Lake Michigan on September 28,2000