Re: Longitude weirdness

[Steve Cousins <cousins@xxxxxxxxxxxxxxxxxxxxxxx>]

On Thu, 26 Jun 2003, Joe McLean wrote:

> Steve,
> 
> What does your XML file x-axis definition look like?

Hi Joe,

Here is what I have in the las.xml file.  There are no entries for
latitude or longitude in the <datasets><variables> section.

     <grids>
      <mf1_11b_19990515_nc_longitude_latitude_grid>
       <link match="/lasdata/axes/mf1_11b_19990515_nc_longitude"/>
       <link match="/lasdata/axes/mf1_11b_19990515_nc_latitude"/>
      </mf1_11b_19990515_nc_longitude_latitude_grid>
     </grids>
     <axes>
      <mf1_11b_19990515_nc_longitude units="degrees" type="x">
       <v>20.140625
       </v>
       <v>20.421875
       </v>
       <v>20.703125
       </v>   
	.
	.
	.

The nc header looks like:

dimensions:
        longitude = 1280 ;
        latitude = 896 ;
        z = 20 ;

variables:
        float longitude(longitude) ;
                longitude:units = "degrees" ;
                longitude:modulo = " " ;
        float latitude(latitude) ;
                latitude:units = "degrees" ;
	.
	.
	.

> Is your NetCDF longitude coordinate variable set to modulo?

I've tried it both with modulo=" " and without.  When modulo=" " is
specified, the las.xml file doesn't reflect it.  I've tried hand entering
in the modulo=" " on the line above like:

     <axes>
      <mf1_11b_19990515_nc_longitude units="degrees" type="x" modulo=" ">

but it doesn't seem to have any effect either.

Since this dataset is on a rectilinear grid the latitude and longitude
variables are just 1D.  I assume this is the way it should be.  I'm used
to working with 2D vars for these so I'm not positive if I have the netCDF
part looking ok in this case.

Thanks for your help,

Steve

 
> Joe
> -------------------------------
> Steve Cousins wrote:
> 
> >> I have some data sets that have longitude values from 20.0 to 380.0.  I'm
> >> not sure why.  I've brought this into a LAS 5.1 server and am trying to
> >> navigate with the map.  The original map that comes up works fine if I hit
> >> the get data button.  However, if I try to specify my own section the
> >> outline box is pushed way over to the left side of the map and I can't get
> >> it to come out.  The values in the Latitude dialogs specify:
> >>
> >>         18.0 E          19.859375 E
> >>
> >> As a test I changed the NetCDF file to have values just from 0 to 360.0
> >> and everything worked fine, except of course, that everything was shifted
> >> by 20.0 degrees.  I've also tried changing the "bounds" values in ui.xml.
> >>
> >> Is there some way of specifying the values in the NetCDF file differently
> >> in order to allow this to work?  Some other way?
> >>
> >> Thanks very much,
> >>
> >> Steve
> >>
> >> _____________________________________________________________
> >>  Steve Cousins                 Email: cousins@umit.maine.edu
> >>  Research Associate            Phone: (207) 581-4302
> >>  Ocean Modeling Group
> >>  School of Marine Sciences     208 Libby Hall
> >>  University of Maine           Orono, Maine 04469
> >
> >
>