Atmospheric Correction

Scripts to modify SeaDAS for using SS14 and SSP algorithms.

Note that these scripts are tested with SeaDAS v2020.1 and might need slight modifications to be used with newer versions.

To install these scripts in SeaDAS, it should be compiled. The process to compile SeaDAS can be found here.

How to use these scripts?

• Backup the existing scripts in $OCSSWROOT/ocssw_src/src/l2gen and then place the scripts provided here.

• Add the get_kappa.c to $OCSSWROOT/ocssw_src/src/l2gen/CMakeLists.txt in the L2GEN_PRODUCT_FILES section.

• Add the following definition to l2prod.h. You can choose your own product ID (XXX) and name, if it is available.

  #define CAT_kappa              XXX
  

• Compile the code as described here.

• While running l2gen use aer_opt=-20 for SSP algorithm and aer_opt=-21 for SS14 algorithm.

• If you want to use kappa as a L2 product you will need to modify l2prod.h, l12_proto.h and prodgen.c as mentioned in HOWTO_Add_a_product.txt present in the $OCSSWROOT/ocssw_src/src/l2gen folder inside ocssw. You will have to add the product in the product.xml file present in $OCDATAROOT/common.

References

• Singh, R.K., Shanmugam, P., 2014. A novel method for estimation of aerosol radiance and its extrapolation in the atmospheric correction of satellite data over optically complex oceanic waters. Remote Sens. Environ. 142, 188–206. https://doi.org/10.1016/j.rse.2013.12.001

• Singh, R.K., Shanmugam, P., He, X., Schroeder, T., 2019. UV-NIR approach with non-zero water-leaving radiance approximation for atmospheric correction of satellite imagery in inland and coastal zones. Opt. Express 27, A1118–A1145. https://doi.org/10.1364/OE.27.0A1118

Author

Rakesh Kumar Singh