Re: [ferret_users] Orthographic projection - variable from 1-degree model

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

Hi,

This looks to me as if it may be an incomplete file, which should have 
separate variables containing longitude and latitude coordinate data. 
Did you write out test.nc from a larger file?  If so, did the original 
file have 2-D variables, on the same grid as SSH, with units of 
longitude and latitude?  If so, see the documentation about "curvilimear 
coordinates".

If your data is on a curvilinear grid, it can be plotted using a map 
projection.  See this FAQ:

https://ferret.pmel.noaa.gov/Ferret/faq/curvilinear-data-in-map-projections

Ansley


On 6/19/2018 6:20 AM, niciej wrote:
> Dear Ferreters,
> I have a data set(test.nc) with SSH variable from 1-degree model.
> Basic Ferret plot of SSH is shown on PIC1
> I'm trying to plot it using orthographic projection:
>
> use test.nc
>
> SET REGION/X=0:360/Y=-90:90/L=1
>
> GO mp_orthographic 10 45
>
> SET GRID ssh
>
> GO mp_aspect
>
> LET masked_ssh = ssh * mp_mask
>
> FILL/NOAX/NOLAB masked_ssh, x_page, y_page
>
> LABEL/NOUSER `($PPL$XLEN)*0.5`,-0.4,0,0,0.2 View From Space
>
> GO mp_fland
>
> GO mp_land
>
> GO mp_graticule
>
> My results are shown on PIC2 - the projection is incorrect, moreover 
> there is a gap between 320 - 360 deg.
> How can I get a correct projection?
> Thanks a lot,
> Jan Niciejewski
> Institute of Oceanology PAS