Difference between revisions of "GSM"
| Line 15: | Line 15: | ||
For daily files:<br> | For daily files:<br> | ||
<br> | <br> | ||
| − | Prod_name.YearDay. | + | Prod_name.YearDay.L3b_DAY.Sat_combo.Proc_vers.Type<br> |
<br> | <br> | ||
where:<br> | where:<br> | ||
| Line 42: | Line 42: | ||
----------<br> | ----------<br> | ||
Describes which sensor or combination of sensors were used to produce the data:<br> | Describes which sensor or combination of sensors were used to produce the data:<br> | ||
| − | SeaWiFS only = | + | SeaWiFS only = 01<br> |
| − | MODIS-Aqua only = | + | MODIS-Aqua only = 02<br> |
| − | SeaWiFS and Aqua = | + | SeaWiFS and Aqua = 03<br> |
<br> | <br> | ||
Proc_vers:<br> | Proc_vers:<br> | ||
----------<br> | ----------<br> | ||
| − | Refers to the version of the data | + | Refers to the version of the data (current processing is 5, associated with the R2009.1 reprocessing effort (http://oceancolor.gsfc.nasa.gov/forum/oceancolor/board_show.pl?bid=27) |
<br> | <br> | ||
Type:<br> | Type:<br> | ||
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'''Examples of daily file names''': | '''Examples of daily file names''': | ||
----------------<br> | ----------------<br> | ||
| − | ''GSMchl.2003121.L3b_DAY. | + | ''GSMchl.2003121.L3b_DAY.01.4.hdf'' -> GSM chlorophyll product from SeaWiFS only L3b data for day 121 of 2003 (May 1, 2003), version 5<br> |
<br> | <br> | ||
| − | ''GSMacdm.2005021.L3b_DAY. | + | ''GSMacdm.2005021.L3b_DAY.03.2.hdf'' -> GSM acdm(443) product from SeaWiFS and MODIS-Aqua L3b data for day 21 of 2005 (January 21, 2005), version 5<br> |
<br> | <br> | ||
<br> | <br> | ||
| Line 78: | Line 78: | ||
_ID:<br> | _ID:<br> | ||
----------<br> | ----------<br> | ||
| + | |||
is "_4D" for four-day, "_8D" for weekly, and "_MO" for Monthly data<br> | is "_4D" for four-day, "_8D" for weekly, and "_MO" for Monthly data<br> | ||
<br> | <br> | ||
| + | |||
'''Examples of composite image names''':<br> | '''Examples of composite image names''':<br> | ||
----------------<br> | ----------------<br> | ||
| − | ''GSMchl.20030012003031_MO.5 | + | ''GSMchl.20030012003031_MO.03.5.hdf'' -> Monthly GSM chlorophyll product from SeaWiFS and Aqua data for January 2003, version 5<br> |
<br> | <br> | ||
| − | ''GSMbbp.20050812005088_8D. | + | ''GSMbbp.20050812005088_8D.02.5.hdf'' -> Weekly GSM bbp(443) product from Aqua only data (March 22-29, 2005), version 5<br> |
<br> | <br> | ||
<p>The data products are available in HDF (Hierarchical Data Format) files. Each product is represented in a 4320 x 2160 array. For each time period considered (Day, 8D, Monthly) there is one HDF file per product. HDF files are compressed and will self extract when opening. PNG images are also available for browsing purposes. </p> | <p>The data products are available in HDF (Hierarchical Data Format) files. Each product is represented in a 4320 x 2160 array. For each time period considered (Day, 8D, Monthly) there is one HDF file per product. HDF files are compressed and will self extract when opening. PNG images are also available for browsing purposes. </p> | ||
Revision as of 15:18, 16 August 2010
Contents
GSM Product Family Description
The ocean color products available here were made using Level 3, daily, binned imagery from SeaWiFS and MODIS-Aqua. The products themselves are 9km daily, weekly (8D) and monthly imagery of GSM products, confidence intervals and coverage maps. The products were generated using the Garver-Siegel-Maritorena (GSM) model described in:
Maritorena S., D.A. Siegel & A. Peterson. 2002. Optimization of a Semi-Analytical Ocean Color Model for Global Scale Applications. Applied Optics. 41(15): 2705-2714.
When multiple sensors are used, the GSM model uses the Normalized Water-Leaving radiances (LwNs) from all available sources over a given bin of the L3 grid as described in:
Maritorena, S. and D.A. Siegel. 2005. Consistent Merging of Satellite Ocean Color Data Sets Using a Bio-Optical Model. Remote Sensing of Environment, 94(4): 429-440.
File Naming convention:
For daily files:
Prod_name.YearDay.L3b_DAY.Sat_combo.Proc_vers.Type
where:
Prod_name:
----------
GSMchl (Chlorophyll concentration) GSMacdm (Dissolved and detrital organic matter absorption coefficent at 443 nm) GSMbbp (Particulate backscattering coefficient at 443 nm) GSMChl_sig (Confidence interval of the Chl product) GSMacdm_sig (Confidence interval of the acdm product) GSMbbp_sig (Confidence interval of the bbp product) GSMcovMask (Coverage map)
Year:
----------
Year in yyyy format
Day:
----------
Day in ddd format (i.e. sequential day of the year)
Sat_combo:
----------
Describes which sensor or combination of sensors were used to produce the data:
SeaWiFS only = 01
MODIS-Aqua only = 02
SeaWiFS and Aqua = 03
Proc_vers:
----------
Refers to the version of the data (current processing is 5, associated with the R2009.1 reprocessing effort (http://oceancolor.gsfc.nasa.gov/forum/oceancolor/board_show.pl?bid=27)
Type:
----------
Describes the type of file (HDF or PNG)
Examples of daily file names:
GSMchl.2003121.L3b_DAY.01.4.hdf -> GSM chlorophyll product from SeaWiFS only L3b data for day 121 of 2003 (May 1, 2003), version 5
GSMacdm.2005021.L3b_DAY.03.2.hdf -> GSM acdm(443) product from SeaWiFS and MODIS-Aqua L3b data for day 21 of 2005 (January 21, 2005), version 5
For "n" day, weekly and monthly data:
Prod_name.SYearSDayEYearEDay_ID.Sat_combo.Proc_vers.Type
Definitions of Prod_name, Sat_combo, Proc_vers and Type are identical to those for the daily files.
YearFDayYearLDay:
----------
Year (in yyyy format)
First day (in ddd format, i.e. sequential day of the year) of daily data used to create the composite image.
Year (in yyyy format)
Last day (in ddd format) of daily data used to create the composite image.
_ID:
----------
is "_4D" for four-day, "_8D" for weekly, and "_MO" for Monthly data
Examples of composite image names:
GSMchl.20030012003031_MO.03.5.hdf -> Monthly GSM chlorophyll product from SeaWiFS and Aqua data for January 2003, version 5
GSMbbp.20050812005088_8D.02.5.hdf -> Weekly GSM bbp(443) product from Aqua only data (March 22-29, 2005), version 5
The data products are available in HDF (Hierarchical Data Format) files. Each product is represented in a 4320 x 2160 array. For each time period considered (Day, 8D, Monthly) there is one HDF file per product. HDF files are compressed and will self extract when opening. PNG images are also available for browsing purposes.
Product Units:
| GSMchl | mg m-3 |
| GSMacdm | m-1 |
| GSMbbp | m-1 |
| GSMchl_sig | mg m-3 |
| GSMacdm_sig | m-1 |
| GSMbbp_sig | m-1 |
Data (links to FTP site)
Metadata
- GSM01 Validation Results (TBA)
- (recent results TBA)
Software
References
Maritorena, S., and D.A. Siegel, 2005: Consistent merging of satellite ocean color data using a semi-analytical model, Remote Sensing of the Environment, 94, 429-440.pdf
Siegel, D.A., Maritorena, S., Nelson, N.B., Hansell, D.A., Lorenzi-Kayser, M., 2002. Global distribution and dynamics of colored dissolved and detrital organic materials. Journal of Geophysical Research, 107, 3228, doi:10.1029/2001JC000965. pdf
Maritorena, S., D.A. Siegel and A.R. Peterson, 2002: Optimization of a semianalytical ocean color model for global-scale applications. Applied Optics-LP, 41, 2705-2714. pdf
Garver, S.A., and D.A. Siegel, 1997: Inherent optical property inversion of ocean color spectra and its biogeochemical interpretation: I. Time series from the Sargasso Sea. Journal of Geophysical Research., 102, 18,607-18,625. pdf
