The five CZCS data products archived at the Goddard Space Flight Center Distributed Active Archive Center (Goddard DAAC) include: Level 1, Level 1a, Level 2, Level 3 PST (Postage Stamp) images, and Level 3 Composite images. Level 1 and 1a data contain calibrated radiances and earth location information for each CZCS scene (a maximum of 2 minutes of data). Level 1 data are at full Local Area Coverage (LAC) resolution (1 km) and level 1a data are subsampled (every 4th pixel, every 4th line) providing 4 km Global Area Coverage (GAC) resolution. Level 2 data were derived from the level 1a data, and contain six derived geophysical parameters for each CZCS scene. The level 3 PSTs are earth-gridded (binned) composites of the derived geophysical parameters, along with compositing statistics, at various temporal resolutions (daily, 5-day weekly, and monthly). They contain the sums of the values, the sums of the squares of the values, and the number of valid samples in each composite bin. The level 3 data are binned to a fixed, linear latitude-longitude (equal angle) grid of dimension 1024 (latitude) x 2048 (longitude) with ~18.5 km resolution at the equator. The level 3 Composites are the means of the level 3 PST products represented as 8-bit raster images."
-- From on-line CZCS Data Set Readme
Measure concentrations of chlorophyll-a and phaeophytin. Map biologically productive areas. Map suspended sediment distribution and determine the type of materials suspended in the water. Map Gelbstoff (yellow substances) as an indicator of salinity. Detect pollutants in the upper level of the oceans. Map temperature of coastal waters and the open ocean. Study the interactions between coastal effluents and open waters." -- Taken from CZCS on-line data set guide document
In order to find CZCS level 1, level 1a, and level 2 data for a specified region, the tool to use is the CZCS data browser, accessible through the World Wide Web. To initiate a browse session, go the following URL: <http://daac.gsfc.nasa.gov/data/dataset/CZCS/index.html>
A telnet option for accessing data is also available. For more information on all of these options see the Data Set Readme at <http://daac.gsfc.nasa.gov/CAMPAIGN_DOCS/OCDST/czcs_readme.html#400>
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