Re: Non lat/lon map projections

[Jonathan Callahan <callahan@xxxxxxxxxxxxx>]

Jennifer,

Funny you should ask.  I was planning on writing some code to provide
preliminary map projection support starting two weeks from now.  I'll
move it up and start on Monday instead.  It would be nice to know what
kind of projections they want but Ferret already has scripts to provide
quite a few.  See the Map Projection FAQ here:

http://ferret.wrc.noaa.gov/Ferret/FAQ/graphics/map_projections.html

I'll let you know when I get things working -- presumably towards the
end of next week.  I expect everything will be written using
configurable aspects of LAS v6.0 and can be added on painlessly to a
standard v6.0 installation.


-- Jon

"Jennifer M. Adams" wrote:
> 
> Hi, Everybody --
> 
> I am collaborating with a group at NASA GSFC on a project
> called Land Information System (LIS) which will be
> generating a lot of model output (global data at 1km
> resolution) that they will distribute via DODS (oops, I mean
> OpenDAP) and a web interface. They are considering using LAS
> as the web interface, but they need to support some
> additional map projections beyond good ol' basic lat/lon.
> 
> In the Ferret documentation, it says that curvilinear map
> projections are supported by using shade, fill, or contour
> with two additional arguments, x_page and y_page, which are
> grids that specify the X page (horizontal) position and Y
> page (vertical) position for each (i,j) index pair.
> 
> So, here's my question. Would it be too terribly difficult
> for me to modify the LAS code to allow for an additional
> view option, something like a "projected xy slice"? I'm
> assuming that the x_page and y_page grids depend on the
> requested plot domain, so I'd have to generate them on the
> fly, for each user request. How would I do this?
> 
> I should mention that the actual projections they'll want to
> support haven't been determined yet, so  I can't be any more
> specific. But even a general discussion on converting to a
> known projection would be helpful.
> 
> Thanks for your advice,
> Jennifer
> 
> --
> ----------------------------------------
> Jennifer Miletta Adams
> Center for Ocean-Land-Atmosphere Studies
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705-3106
> Phone: (301)902-1278 or (301)595-7000
> Fax:   (301)595-9793
> Email: jma@cola.iges.org