USF IMaRS MODIS GCOOS SeaDAS Chlorophyll and Related Fields

Interactive WCS Coverage Request Form

This interactive form allows you to choose spatial and temporal subsets of USF IMaRS MODIS GCOOS chlorophyll and related fields for the Gulf of Mexico, and then obtain them from the THREDDS WCS server. There is a similar page for SST and related variables.

Further information about how this data is obtained and processed can be found at both IMaRS and NASA MODIS RRS.

Questions, problems or suggestions should be sent to


In the interactive form below, you will choose the parameters for your data request and then press the SUBMIT form to obtain your data. If you make a mistake, just re-enter the correct desired parameters and hit the SUBMIT button again.

Available Fields

This table lists the available variables. Immediately below the table is an expandable menu that enables you to select one of these variables.

Variable Name Description Units
Kd_488_lee diffuse attenuation coefficient at 488 nm, Lee Algorithm m^-1
l2_flags level-2 processing flags NA
taua_551 aerosol optical thickness at 551 nm dimensionless
angstrom_551 angstrom coefficient, 551 to 869 nm dimensionless
bbp_551_qaa particulate backscatter at 551 nm, QAA algorithm m^-1
cfe fluorescence efficiency dimensionless
seadas_K_490 diffuse attenuation coefficient at 490 nm (OBPG) m^-1
adg_443_qaa absorption due to gelgstoff and detrital material at 443 nm, QAA algorithm m^-1
nLw_678 normalized water-leaving radiance at 678 nm m^-1
aph_443_qaa absorption due to phytoplankton at 443 nm, QAA algorithm m^-1
sena sensor azimuth angle degrees
tau_869 aerosol optical thickness at 869 nm dimensionless
senz sensor zenith angle degrees
nLw_443 normalized water-leaving radiance at 443 nm mW cm^-2 um^-1 sr^-1
adg_443_carder absorption due to gelbstoff and detrital material at 443 nm, Carder algorithm degrees
nLw_488 normalized water-leaving radiance at 488 nm mW cm^-2 um^-1 sr^-1
nLw_412 normalized water-leaving radiance at 412 nm mW cm^-2 um^-1 sr^-1
tsm_clark total suspended matter, D. Clark, 2003 mg l^-1
nLw_869 normalized water-leaving radiance at 869 nm mW cm^-2 um^-1 sr^-1
chlor_a chlorophyll concentration, OC3 algorithm mg m^-3

Select one of the variables listed above from the expandable menu below.

Choosing a Spatial Subset

Select a spatial extent. The ranges are shown in parentheses. The defaults are the entire range.

Min. longitude (-98.0):
Max. longitude (-79.01099):
Min. latitude (18.01039):
Max. latitude (31.0):

Choosing a Time Subset

Select a time range. For a single time, select the same value for the starting and ending times. The default is the first available time. The available times are listed in chronological order in the expandable menus below in the format YYYY-MM-DDTHH:MN:SSZ indicating, consecutively: year, month, day, hours, minutes and seconds.



Choosing an Output Format

The available output formats are:

Variable Name Description
NetCDF3 a NetCDF file following the CF-1.0 convention
GeoTIFF a grayscale 8-bit GeoTIFF file
GeoTIFF_Float a floating point GeoTIFF file

Select a format for the file to be downloaded. The default is NetCDF3.

Available file types:

Choosing a Name for the Output File

Select a name for the file to be downloaded. The default is

Output filename:

Checking Your Choices and/or Obtaining the File

Click SUBMIT to see the values you have selected.

No values have been chosen. You must choose them above and click on SUBMIT.