Hello,

I'm using chlorophyll concentration from subscripted level 2 MODIS images (Mapped NRT Data) and I'd like also to get the SST measurements, but the values don't look like Celsius degree.
Does anyone knows how to convert these values to Celsius degree unit?

Thanks,
Paula Lamosa Nunes

From my sst image, the unit should be Celsius degree.

Paula,

The chlorophyll is stored as a floating point value in the L2 HDF file.
SST, however, is stored as a scaled integer.  The scaling factor is
included in the SDS attributes.  SeaDAS (as Long showed) will
correctly interpret the SDS scaling.  If you are not using SeaDAS,
you will have to do the scaling on your own.

Sean

Thanks Long and Sean;

It's true, I'm not using SeaDAS, I convert the *hdf files with 'ncl_convert2nc' and then open these images on Ferret.
sorry I didn't understand what is an SDS attribute, so I looked for it in the forum and found another person with the same problem:
http://oceancolor.gsfc.nasa.gov/forum/oceancolor/topic_show.pl?pid=941;hl=SDS%20attributes#pid941

Then I made the same :
sst*slope + intercept

and the values look like being on Celsius degree. (http://img190.imageshack.us/img190/5669/tsmbrasil.gif)
Is this trick all right?

Thanks a lot again!
Paula

Yes

Sean

Sorry Sean, a bit off topic, but is there any way to possibly get the measurements in fahrenheit?

F = ((C / 5.) * 9.) + 32.

I realize the sillyness of my question now. Thanks Sean, I'll just convert it. Need it for an Oceancolor marketing project I'm working on which will be based in the US and used by non-scientists here.