For Dunja

[Ren Diandong]

Tell me how your satellite data is produced (reference lat, ref. lon, dx
(km) and dy (km) and how many columns and how many rows.
Finally, tell me which hemisphere the data locates.

Also, satellite data is always WS84 convention, if not, tell me the
eccentricity you used in producing your satellite data.

I can put this into a rather sophisticated tool to get the pdef needed
parameters and many grid statistics associated with it.

It is easier than the angle to angle projection that I just implemented,
which need  the center lon to divide the negative and positive
region... ...

Best wishes,

D. Ren

On Tue, 2006-11-14 at 07:19 +0100, Dunja Drvar wrote:
> Sorry, I don't quite understand what you mean.
> Namely, I have the data in polar stereographic and plotting is not the
> problem. But, I need to overlay that on my satellite image which has a
> different polar stereographic projection. So, I have to find out what
> mproj nps really means to set it up in my satellite production system.
> I hope I explained the problem clear enough.
> Thanks,
>          Dunja
>
>
> > In any mapping, lat-lon grid line is casted to the grid space defined by
> > your data (mapped on a flat paper, usually rectangular). Thus, GrADS
> > needs the formula of finding the grid (i.e., i,j) location for lat and
> > lon. Thus, just use the lat and lon variable and the inverse formula to
> > find their (i,j---grid counting) locations and use draw line command to
> > finish the task!
> >
> > For developers: is there an option for the rotated projection right now?
> > I used the above procedure in answering a previous question.
> >
> > Anyway, I will summarize the experience and post it soon.
> >
> >
> > D. Ren
>