id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
527	Updated seagrid2roms matlab script	arango	arango	"The '''!SeaGrid''' Matlab GUI was written by Chuck Denham around 1999 and its becoming out of date as Matlab continue to evolve and retire obsolete functions. This GUI has always work for me with Matlab '''2006b'''.  The update here is to work with newer versions of Matlab. I tried Matlab '''R2010a''' which is installed on my iMac. In order to get '''!SeaGrid''' working I have to make few changes.

It also has been reported in the past that the script '''seagrid2roms.m''' which is used to write the ROMS NetCDF from the '''seagrid.mat''' file generated by '''!SeaGrid'''.  The NetCDF interface inside Matlab has also evolved substantially. There are several messages about this in the ROMS forum. This issue has been in my to do list for very long time.  So I finally took some time to look at these reported problems.  I rewrote '''seagrid2roms.m''' to work with the '''mexnc''' interface. Notice the this script now uses:
 * '''matlab/grid/c_grid.m''' to create ROMS Grid NetCDF
 * '''matlab/landmask/uvp_masks.m''' to compute the masks at '''U'''-, '''V'''-, and '''PSI'''-points
 * '''matlab/utility/nc_write.m''' to write data into Grid NetCDF file
I did noticed that '''!SeaGrid''' gives a nonzero rotation '''angle''' even if the grid is not rotated.  The values are of the order 1E-12. I don't know if this is a round off error or there is something wrong in that computation.  '''!SeaGrid''' is complicated and has a logic that it is very difficult to follow.  I am adding this in my to do list to track this computation inside the GUI in the future.

There are other minor updates that are required to the '''!SeaGrid''' package as Matlab continue complaining about obsolete features. We will do this incrementally in the future.  We need to reconsider the full grid generation package for ROMS after the full nesting capabilities are released in the near future.

I also added a new script:

 * '''matlab/utility/nc_drename.m:'''  Generic script to rename a NetCDF dimension.

"	upgrade	closed	major	Matlab Processing Scripts	Matlab	3.6	Done