| The wide swath and frequent overflights permit generation of a wide variety
of SeaWinds Image products. For highest possible spatial resolution, multiple
orbit passes are combined. These are the 'all pass' images. Since generally
orbit passes of a given point on the Earth occur at nearly the same time
of day, time-of-day studies are facilitated by computing images from ascending
(morning) passes only, and descending (evening) passes only.
For improved temporal resolution in the polar regions, daily
local-time-of-day images have been generated.
Images are made both from the SeaWinds on QuikScat "egg" backscatter
measurements and from the "slice" measurements. Generally, slice measurements
yield higher spatial resolution but are noiser than egg measurements.
Further information is available in the QuikSCAT
Enhanced Resolution Image Users Notes.
Note that these enhanced resolution sigma-0 images are different than the
QuikSCAT Sigma-0 Browse Product images,
which are non-enhanced resolution image products designed for rapid browings.
NOTE: This page provides access only to images processed from
the VERSION 2 QuikSCAT L1B files. JPL switched to
VERSION 2 processing in mid 2006 (JD 189). Due to differences in the
processing, the slice location, incidence angles, and calibration, the
VERSION 1 files are slightly different than the VERSION 2 L1B files.
JPL is reprocesing the entire mission to VERSION 2. To avoid
continuity problems between the two versions, the sigma-0 images are
kept separate.
Images processed from the old VERSION 1 data (all data before JD 189,
2006) can be found in the data/qscatv2 directory on the ftp site or
accessed here
The file format naming scheme, etc. for SCP images made from
VERSION 1 and VERSION 2 QuikSCAT files are identical and all
utilities, land masks, etc. work the same on both versions. Note,
however, that ascending and descending polar images have been
discontinued in Version 2, to be replaced with local time of day
images.
|
Available Version 2 (2006+)
Image Classes
* Only Ant, Arc, and Grn regions
** Only Ant region
*** Only Arc and Grn regions
+ Ascending/descending polar images have been discontinued in Version 2
|
