SeaDAS Tutorial: Loading Data

Seadisp: Loading data

Loading SeaWiFS L1A, L1B, L2,L3 Binned, L3 SMI and Browse: Levels 1A and 2
Loading SeaWiFS L0 files.
Loading MODIS L1A, L1B,, L2, L3 Binned, and L3 SMI: Levels 1A, 2 and 3
Loading OCTS/NASDA files: Levels 0, L1A, L1B , L2, L3 Mapped, L3 Binned Mapped
Loading OCTS/SeaDAS files: Level 2
Loading CZCS/DAAC HDF files
Loading CZCS/SEAPAK files
Loading SeaDAS mapped (projected) HDF files
Loading general HDF files
Loading Flat Binaryfiles
Loading PNG files
Loading True Color files

Loading SeaWiFS L1A Data (load)

Interactive mode:

From Seadisp Main Menu->Load, select menu item SeaWiFS.
From the Product Selection For SeaWiFS File widget:

Enter the file name or select a file using the Select button. Try file '$SDSDEMO/L1_gac1.hdf'.
Press the Okay button or simply <RETURN> to view all available products in the file.
Select the band(s) to be loaded and press the Load button.

Command mode:

Load bands 1 and 5 from SeaWiFS Level-1 file '$SDSDEMO/L1_gac1.hdf':

load

prod_ix

Loading SeaWiFS L2 Data (load)

Interactive mode:

From Seadisp Main Menu->Load, select menu item SeaWiFS.
From the Product Selection For SeaWiFS File widget:

Enter the file name or select a file using the Select button. Try file '$SDSDEMO/L2_gac1.hdf'.
Press the Okay button or simply <RETURN> to view all available products in the file.
Select the band(s) to be loaded and press Load button .

Command mode:

Load products 'La_865' and 'chlor_a' from SeaWiFS Level-2 file '$SDSDEMO/L2_gac1.hdf'

load, '$SDSDEMO/L2_gac1.hdf', prod_name=['La_865', 'chlor_a']

Loading SeaWiFS Level-3 binned Data (load)

Interactive mode:

From Seadisp Main Menu->Load, select menu item SeaWiFS.

From the Product Selection For SeaWiFS File widget:

Enter the file name or select a file using the Select button. Try file 'L3_daily1.hdf'.
Press the Okay button or simply <RETURN> to view all available products in the file.
Required inputs are the measurecategory, band product, projection and window size inputs.
It is better to not modify the projection default values for Center Lat/Lon, Rotation , Lat Limit and Long Limit until viewing an output image first.
Press Load button to load.

Command mode:

Load product 'chlor_a' from a SeaWiFS Level-3 space-binned file.

load

prod_name =

Load product 'chlor_a' from a SeaWiFS Level-3 time-binned file.

load,

prod_name =

, /ORTHO

Loading SeaWiFS L3 SMI Data (load)

Interactive mode:

From Seadisp Main Menu ->Load select the menu item SeaWiFS.
From the Product Selection For SeaWiFS File widget:

Enter the file name or select a file using the Select button. Try file '$SDSDEMO/L3_daily1_smi_CHLO_mn.hdf'.
Press the Okay button .
The L3 SMI product is a byte array of size 4096 pixels x 2048 lines. The sample rate default of 8 is set to return sub-sampled data array 512 x 256. Be aware that you may exceed the memory limits of your display device if you decrease the default sub-sampling rate.
Select the single available band and press the Load button.

Command mode:

Load the SeaWiFS Level-3 SMI file '$SDSDEMO/L3_daily1_smi_CHLO_mn.hdf ' and subsample by 10 instead of by the default of 8.

load

XSAMPLE

YSAMPLE

Loading SeaWiFS Browse Data for L1A and L2 files (load)

Interactive mode:

From Seadisp Main Menu->Load select the menu item SeaWiFS.
From the Product Selection For SeaWiFS File widget:

Enter the file name or select a file using the Select button for any SeaWiFS browse file. Try files:

L1A browse : '$SDSDEMO/L1_gac1_brs.hdf' (contains band 8)
L2 browse : '$SDSDEMO/L2_gac1_brs.hdf' (contains chlor_a product)

Press the Okay button.
All SeaWiFS browse files contain a single raster image and a color palette:

Select the single available band
Decide whether to load the color palette stored in the file
Press the Load button

Command mode:

Load the SeaWiFS L1A band 8 browse file '$SDSDEMO/L1_gac1_brs.hdf'

load

Load the SeaWiFS L2 chlorophyll_a browse file '$SDSDEMO/L2_gac1_brs.hdf'

load

Loading SeaWiFS L0 Data(load)

Interactive mode:

From Seadisp Main Menu->Load, select menu item SeaWiFS L0.
From the Product Selection For SeaWiFS L0 File widget:

Enter the file name or select a file using the Select button. Try file '$SDSDEMO/L0_hrpt1.dat'.
Press the Okay button or simply <RETURN> to view all available products in the file.
These files are very large. To display the image more quickly, you can subsample the image or view a portion of the full resolution data.

Increase Pixel Sample Rate and/or Line Sample Rate to subsample the image further.
Reduce Pixel range and/or Line range and reduce the sample rates to 1 to view a small portion of the full resolution data.

Select the band to be loaded and press Load button. (Just select one. These files are very large).

Command mode:

Load bands 1 and 8 from SeaWiFS Level-0 file '$SDSDEMO/L0_hrpt1.dat' subsampled by a factor of 10.

load, '$SDSDEMO/L0_hrpt1.dat', ftype='L0', xsample=10, ysample=10, prod_ix=[1,8]

Loading MODIS L1A Data (load)

Interactive mode:

From Seadisp Main Menu->Load, select menu item MODIS.
From the Product Selection For MODIS File widget:

Enter the file name or select a file using the Select button. Try file '$SDSDEMO/A2005191123500.L1A_LAC'.
Press the Okay button or simply <RETURN> to view all available products in the file.
Select the band(s) to be loaded and press the Load button.

Command mode:

Load bands 1 and 5 from MODIS Level-1 file '$SDSDEMO/A2005191123500.L1A_LAC':

load

prod_ix

Loading MODIS L1B Data (load)

Interactive mode:

From Seadisp Main Menu->Load, select menu item MODIS.
From the Product Selection For MODIS File widget:

Enter the file name or select a file using the Select button. Try file '$SDSDEMO/A2005191123500.L1B_LAC'.
Press the Okay button or simply <RETURN> to view all available products in the file.
Select the band(s) to be loaded and press the Load button.

Command mode:

Load bands 1 and 5 from MODIS Level-1B file '$SDSDEMO/A2005191123500.L1B_LAC':

load

prod_ix

Loading MODIS L2 Data (load)

Interactive mode:

From Seadisp Main Menu->Load, select menu item MODIS.
From the Product Selection For MODIS File widget:

Enter the file name or select a file using the Select button. Try file '$SDSDEMO/A2005191123500.L2_LAC'.
Press the Okay button or simply <RETURN> to view all available products in the file.
Select the band(s) to be loaded and press Load button .

Command mode:

Load products 'La_865' and 'chlor_a' from MODIS Level-2 file '$SDSDEMO/A2005191123500.L2_LAC'

load, '$SDSDEMO/A2005191123500.L2_LAC', prod_name=['La_865', 'chlor_a']

Loading MODIS Level-3 binned Data (load)

Interactive mode:

From Seadisp Main Menu->Load, select menu item MODIS.

From the Product Selection For MODIS File widget:

Enter the file name or select a file using the Select button. Try file 'A2005191123500.L3b_LAC'.
Press the Okay button or simply <RETURN> to view all available products in the file.
Required inputs are the measurecategory, band product, projection and window size inputs.
It is better to not modify the projection default values for Center Lat/Lon, Rotation , Lat Limit and Long Limit until viewing an output image first.
Press Load button to load.

Command mode:

Load product 'chlor_a' from a MODIS Level-3 space-binned file.

load

prod_name =

Load product 'chlor_a' from a MODIS Level-3 time-binned file.

load,

prod_name =

, /ORTHO

Loading MODIS L3 SMI Data (load)

Interactive mode:

From Seadisp Main Menu ->Load select the menu item MODIS.
From the Product Selection For MODIS File widget:

Enter the file name or select a file using the Select button. Try file '$SDSDEMO/A2005191123500.L2_LAC_smi_CHLO_mn.hdf'.
Press the Okay button .
The L3 SMI product is a byte array of size 4096 pixels x 2048 lines. The sample rate default of 8 is set to return sub-sampled data array 512 x 256. Be aware that you may exceed the memory limits of your display device if you decrease the default sub-sampling rate.
Select the single available band and press the Load button.

Command mode:

Load the MODIS Level-3 SMI file '$SDSDEMO/A2005191123500.L2_LAC_smi_CHLO_mn.hdf' and subsample by 10 instead of by the default of 8.

load

XSAMPLE

YSAMPLE

Loading OCTS/NASDA Data (load)

Interactive mode:

From Seadisp Main Menu->Load, select menu item OCTS/NASDA.
From the Product Selection For OCTS File widget:

Enter the file name or select a file using the Select button. Try file '$SDSDEMO/octs_nasda_L2oc2.hdf'.
Press the Okay button or simply <RETURN> to view all available products in the file.
Select the band(s) to be loaded and press Load button.

Command mode:

Load chlorophyll data from NASDA L2 file. Subset in both the pixel and line direction:

load

prod_name

lin_range

pix_range

Loading OCTS/SeaDAS Data (load)

Interactive mode:

From Seadisp Main Menu->Load, select menu item OCTS/SeaDAS.
From the Product Selection For OCTS/SeaDAS File widget:

Enter the file name or select a file using the Select button. Try file '$SDSDEMO/L2_octs1.hdf'.
Press the Okay button or simply <RETURN> to view all available products in the file.
Select the band(s) to be loaded and press Load button.

Command mode:

Load CZCS pigment from SeaDAS Level-2 OCTS file. Subsample by 10.

load,

prod_name

xsample

ysample

ftype

Loading Flat Binary Data (load)

Interactive mode:

From Seadisp Main Menu->Load, select the menu item Flat File.
From the Flat File Selection Widget:

Enter the file name or select a file using the Select button. Try file '$SDSDEMO/seapak5.img'.
Enter in information about this flat file. The above file has a 512-byte header to skip, followed by a 512x512 byte array:

Enter Skip bytes: 512, Number of points: 512, Number of lines: 512, Data type: BYTE.

Press the Load button.

Command mode:

Load the flat binary file of data type byte and size 512x512 with a 512-byte header '$SDSDEMO/seapak5.img '.

load

ftype

pixel

line

skipbytes

datatype

Loading SeaDAS Mapped (Projected) Files (load)

Interactive mode:

From Seadisp Main Menu->Load, select the menu item SeaDAS Mapped.
From the SeaDAS Mapped Product Selection Widget :

Enter the file name or select a file using the Select button. Try files '$SDSDEMO/L1_gac1_map.hdf' and '$SDSDEMO/L3_monthly1_map.hdf'.
Press the Okay button to view all available mapped products in the file.
Select the bands to be loaded and press Load button.

Command mode:

Load the first two products found in SeaDAS mapped file '$SDSDEMO/L1_gac1_map.hdf'.

load

ftype

prod_ix

Curator: OceanColor Webmaster

Authorized by: gene carl feldman

Updated: Monday, 10-Nov-2008 10:46:20 EST