Hello everyone,

I'm new to using SeaDAS. What I'm trying to do is look at cyanobacteria specifically using MODIS bands to look at phycocyanin, which uses an algorithm that solves for total absorption and back scatter using reflectance data. I know that this has been done using SeaDAS but since I'm new to SeaDAS I don't know where to start when it comes to understanding how to use SeaDAS to do this.

If anybody has done something similar like this and has suggestions, or has some suggestions on specific posts and tutorials to look at (I have been looking through the "SeaDas Training Material") it would be greatly appreciated.

Sorry for what must be a very beginner question. I have been trying to learn all I can about how to use this program properly.

Thank you,

-Cassie

Cassie,

See the help for User Defined Band Operations

If you have an algorithm (in IDL, or converted to IDL), you can use this feature to create a new band.

Sean

Well, the good news is that your comment is very helpful and puts me on the right track. The bad news is, I've never used IDL before, so now I'll have to figure out how to obtain it/learn it/convert the algorithm to IDL. But thank you very much for putting me on the right track with this.

SeaDAS is built on IDL (at least currently...).  You don't need to get it...
The user defined band function has examples (in the GUI, click the  'Examples' button).
There is an example of how to compute chlorophyll from input radiance.  That example should give you a good starting point.
The rest is just math.  If the algorithm is in FORTRAN, the conversion to IDL should be easy.

Sean

I'm getting an error while starting on linux, the newest release of Ubuntu

/home/cassie/seadas6.2/build/lib/IDLshare.so: wrong ELF
class: ELFCLASS32 Please consult the supplier of the application

Edit: I must have installed 32 bit by mistake... I'll try and install it again.

I have another question, now that I have SeaDAS working.

I was able to find the example you mentioned, but it's not entirely clear to me what level of MODIS I should use, and whether I need to do pre-processing before I take the steps outlined in the tutorial. Could someone give me a hint on what I need to do before I follow the processing steps in the example?

The example for creating a chlorophyll products uses L2 as input - although the example
was written when our L2 products had nLw's in them.  They now have Rrs, so the conversion
doesn't need to be done.

For your case, since you indicated the algorithm you have uses reflectances, this would indicate
L2 is the product you need...

Sean