[ferret_users] Re: [las_users] Different value in netCDF/missing add_offset

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Hi Sam,
There was a bug in a scripts LAS that write the netCDF file in the version of LAS that you are running, which was corrected in LAS V8. If you are able to upgrade your LAS,  that should fix things.

Ansley

On 6/19/2013 4:21 PM, Luu, Sam (3980-Affiliate) wrote:

Hi

My name is Sam, I will be working with Rosanna and Kacie for PO.DAAC’s LAS. I am new to LAS and would appreciate some help trying to solve an issue. I am encountering different values in the netCDF output. In my case, it is resulting in negative values for Kelvin temperature scale. I see a scale_factor in the attributes but an add_offset is not shown, is it possible that might be the issue in the netCDF output?

 

I have attached some data showing the discrepancies for one example area in the

Ocean Temperature / GHRSST - Group for High Resolution SST Version 1 / GHRSST Level 4 MUR Global Foundation Sea Surface Temperature Analysis (0.011deg/1.2km)  Dataset http://thredds.jpl.nasa.gov/las/getUI.do

 

I would be grateful if anyone could offer any input or help!

 

Thank you!
Sam Luu

 

Data from showing values in LAS output:

 

             VARIABLE : analysed sea surface temperature (kelvin)

             DATA SET : Multi-scale Ultra-high Resolution (MUR) SST analysis

             FILENAME : aggregate__ghrsst_JPL-L4UHfnd-GLOB-MUR.ncml

             FILEPATH : http://seastore.jpl.nasa.gov/thredds/dodsC/GHRSST_JPL-L4UHfnd-GLOB-MUR_TIMEAGG/

             SUBSET   : 7 by 7 points (LONGITUDE-LATITUDE)

             TIME     : 01-JUN-2002 09:00

                   118.4W 118.4W 118.4W 118.4W 118.4W 118.4W 118.3W

                  5607   5608   5609   5610   5611   5612   5613

31.58N  / 11067:  288.1  288.1  288.1  288.2  288.2  288.2  288.2

31.569N / 11066:  288.2  288.2  288.2  288.2  288.2  288.2  288.2

31.558N / 11065:  288.2  288.2  288.2  288.2  288.2  288.2  288.2

31.547N / 11064:  288.2  288.2  288.2  288.2  288.2  288.2  288.2

31.536N / 11063:  288.2  288.2  288.2  288.2  288.2  288.2  288.2

31.525N / 11062:  288.2  288.2  288.2  288.2  288.2  288.2  288.3

31.514N / 11061:  288.2  288.2  288.2  288.2  288.3  288.3  288.3

 

Data from MATLab pulled from netCDF:

 

1.0e+04 *

 

   -0.9928   -0.9944   -0.9959   -0.9973   -0.9986   -0.9999   -1.0010

   -0.9922   -0.9938   -0.9954   -0.9968   -0.9982   -0.9995   -1.0007

   -0.9915   -0.9932   -0.9947   -0.9962   -0.9977   -0.9991   -1.0003

   -0.9906   -0.9923   -0.9940   -0.9956   -0.9971   -0.9985   -0.9998

   -0.9896   -0.9914   -0.9931   -0.9947   -0.9963   -0.9978   -0.9992

   -0.9884   -0.9902   -0.9921   -0.9938   -0.9954   -0.9970   -0.9985

   -0.9870   -0.9890   -0.9908   -0.9927   -0.9944   -0.9961   -0.9976