Re: [ferret_users] Problem with Longitude too

[nguyen@xxxxxxxxxx]

Hi Siang Chye
when define your lat and lon axes, add the qualifier /unit=degrees like that:
DEF AXIS/y=87.9S:87.9N/npoints=64/unit=degrees y1
DEF AXIS/x=0E:2.8W/npoints=128/unit=degrees x1
your xaxis will inherently "modulo", indicating that the axis wraps
around?the first point immediately following the last

Or you can also specify your xaxis with the qualifier /modulo
cheers

Hanh


> Dear all,
>
> I am trying to plot a graph of Europe i.e from 31.7W to 33.7E, but the
> longitude
> stops at greenwich. I had read the data from an ascii file and I am not
> sure if
> this might be the problem as I do not have a problem plotting Europe with
> a
> netCDF file I obtained from MeteoFrance.
>
> The Ferret commands I had used to read from the ascii file are as follows:
>
> DEF AXIS/y=87.9S:87.9N/npoints=64 y1
> DEF AXIS/x=0E:2.8W/npoints=128 x1
> DEF GRID/x=x1/y=y1 g1
> FILE/VAR="alpha"/GRID=g1 alpha.dat
>
> I also tried converting the ascii file to a netCDF file using the
> following
> command:
>
> SAVE/FILE="alpha.nc" alpha
>
> but I still had problems with the longitudes. When I typed
>
> SET AXIS/modulo "alpha,return=xaxis",
>
> a solution I found from one of the archived mails, I was returned the
> following
> error message:
>
> invalid command: unknown axis: alpha,return=xaxis
>
> I would greatly appreciate if someone could advice me how to overcome the
> problem. Thank you.
>
> Best Regards,
> Siang Chye
>