| l1aextract_seawifs | |
Creates an extracted L1A SeaWiFS file.
Location
Details
Command Line Usage
SeaDAS-OCSSW -> extractor
l1aextract_seawifs is used to create a sub-scene file by extracting and/or sub-sampling from an original SeaWiFS L1A file. The output file is an HDF file and has the same format as the original L1A file.
The l1aextract_seawifs GUI allows the user to specify either the pixel/line ranges, the lat/lon ranges, or the two lat/lon corner points for the subscene to be extracted.
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| UI Element Name | Type | Description | Required/Optional | Default Value |
| infile | Text Field | Input MODIS Aqua or Terra L1A file to be extracted, or an L1A filelist for multiple file extraction. (Required) | Required | |
| ofile | Text Field | Output filename for the L1A extracted subscene. A default ofile name is generated by the program. | Required | |
| swlon | Text Field | Longitude of southwest corner of the box to be extracted. | Conditional | |
| swlat | Text Field | Latitude of southwest corner of the box to be extracted. | Conditional | |
| nelon | Text Field | Longitude of northeast corner of the box to be extracted. | Conditional | |
| nelat | Text Field | Latitude of northeast corner of the box to be extracted. | Conditional | |
| spix | Text Field | Starting pixel in infile for extracting. | Conditional | |
| epix | Text Field | Ending pixel in infile for extracting. | Conditional | |
| sscan | Text Field | Starting line in infile for extracting. | Conditional | |
| escan | Text Field | Ending line in infile for extracting. | Conditional | |
| pix_sub | Text Field | Pixel sub-sampling rate. | Optional | |
| sc_sub | Text Field | Scan line sub-sampling rate. | Optional |
| UI Element Name | Type | Description |
| Browser Button | Button | Selects infile/ofile |
| Compute PixLines from LonLat | Button | Derives spixl, epixl, sline, and eline arguments from swlon, swlat, nelon, and nelat arguments by internally executing the lonlat2pixline program. |
| Load Parameters ... | Button | Reads in previously saved parameters and populates the fields in GUI. |
| Store Parameters ... | Button | Saves the current arguments in GUI in a file. |
| Run | Button | Executes the l1aextract_seawifs command with arguments provided in the UI. |
| Cancel | Button | Closes current processor GUI. |
| Apply | Button | Makes current arguments effective. |
| Open in SeaDAS | Checkbox | If selected, the ofile will be added to the open products list right after its generation. |
| ? | Button | Displays the help content of the current command. |
Usage: l1aextract_seawifs infile spix epix sscan escan pix_sub sc_sub outfile
where:
infile - input l1a data HDF file
spix - start pixel number
epix - end pixel number
sscan - start scan line
escan - end scan line
pix_sub - pixel subsampling rate
sc_sub - scan line subsampling rate
outfile - output file name
NOTE: Start and End pixel/scanline will be set to input file's nsamp
and nrec respectively, if, the given values are out of range