[las_users] las: LAS does not produce longitude time plots

[Martin Schmidt <martin.schmidt@xxxxxxxxxxxxxxxxx>]

Hi,
I am using LAS v 8.0 with ferret 6842. With Longitude-time of 
Longitude-depth plots I get the error:

Bailing out of external function "samplexy_curv_nrst":
	Arg 2, curvilinear X coordinates, contains missing values

Re-defining viewport FULL_VIEW
Re-defining viewport FULL_VIEW2
 **ERROR: error in external function
SHADE/KEY=CONT/LEVELS=v/TRIM/LEVELS=v/TITLE="  Practical Salinity   (psu)" sampled_var0
Command file, command group, or REPEAT execution aborted
ERROR RUNNING SCRIPT


The error occurs only, if land points are included in the plot, but also, if the line ends
near a coast.

The data are in geographical coordinates, but the structure is more general. From ncdump
        float temp(time, st_ocean, yt_ocean, xt_ocean) ;
                temp:long_name = "Potential temperature" ;
                temp:units = "degrees C" ;
                temp:valid_range = -10.f, 500.f ;
                temp:missing_value = -1.e+20f ;
                temp:_FillValue = -1.e+20f ;
                temp:cell_methods = "time: mean" ;
                temp:time_avg_info = "average_T1,average_T2,average_DT" ;
                temp:coordinates = "geolon_t geolat_t" ;
                temp:standard_name = "sea_water_potential_temperature" ;

geolon_t and geolat_t are 2D-versions of yt_ocean and xt_ocean.
I am not sure, if ferret (or the las) recognises this dependency. This may be a problem, since
geolon_t and geolat_t have missings, but only away from the coastline in the inner land.
For example  list/x=6.21:14.25/y=-22.58 geolon, geolat_t shows no missing value, the LAS
error shows up when a line covers only ocean points x=6.21:13.25.

So my questions:

- is LAS able to recognise such a dependency?
- it would be a big deal to remove these coordinates from the original file. Is it
possible to remove the "coordinates" attribute within a THREDDS or the LAS?
- is there possibly another source of this failure?

The LAS and the data are public:

http://phy-50.io-warnemuende.de:8080/las

http://phy-50.io-warnemuende.de:8080/thredds/dodsC/genus/genus_run_81_5day_ocean.nc

Any suggestion would be of great help.

Martin Schmidt