[MetaCRS] Adding Projection Classes to Proj4js

[Brendan Billingsley]

My schedule over the next month is rather hectic, so I would not hold up
waiting on me. There is a chance I will get the free time this week, if
not I would guess that I won't get back to this until January.

Thanks,
    Brendan

Mike Adair wrote:
> I wasn't planning on looking into this just yet but for an example of
> handling sphere/ellipse see the laea.js projection, just replace the
> math within the "if (this.sphere){ } else {}" blocks with code from
> Proj.4.
>
> I am hoping to put out a 1.0.1 release next week with some bug fixes
> and the cassini projection but will wait if you plan to do some work
> on this.
>
> Mike
>
>
> Richard Marsden wrote:
>> I submitted the code, but it is only for the spherical Earth - and I
>> believe it is in the current distribution.
>>
>> I've also since added code to handle the Gnomonic (+gnom) projection,
>> but I've only tested the forward projection. Again it is spherical only.
>>
>>
>> Richard
>>
>>
>> On Tue, Dec 8, 2009 at 6:36 PM, billinb <billinb at nsidc.org
>> <mailto:billinb at nsidc.org>> wrote:
>>
>>
>>     Did this ever get finished? I just came across this problem today.
>>     I can work
>>     around it by using AJAX to get to the server and have proj4 do the
>>     transformation, but I would rather get it working in proj4js. Are
>>     there any
>>     plans to get it in? Do you need help finishing it? I don't know
>>     how to do
>>     the forward and reverse transformation on an ellipsoid but I could
>>     potentially take a look at the proj4 code. I could also take a
>> look at
>>     writing the unit tests.
>>
>>     Thanks,
>>      Brendan
>>
>>
>>     Richard Marsden wrote:
>>     >
>>     > Thanks Mike.  I'll have a look when I return (currently on
>>     vacation!)
>>     >
>>     > The problem with the inverse is knowing how to handle the
>>     ellipsoid rather
>>     > than the sphere.
>>     > Perhaps with a pen and paper or some web searching, I can find
>>     the answer.
>>     >
>>     > Richard
>>     >
>>     >
>>     > On Thu, Jul 30, 2009 at 3:07 PM, Mike Adair
>>     <madair at dmsolutions.ca <mailto:madair at dmsolutions.ca>> wrote:
>>     >
>>     >> Hi Richard,
>>     >>
>>     >> Thanks for this,  I don't know about the math involved here
>> but the
>>     >> coding
>>     >> looks fine.  It's best to have an independent test point to
>>     check this
>>     >> against and you could add that to proj4js/test/testdata.js.  I
>>     wouldn't
>>     >> want
>>     >> to add this without both the forward and inverse transforms
>>     however, can
>>     >> you
>>     >> do that one as well?
>>     >>
>>     >> The best place to put this is as a patch on the Proj4js trac
>>     instance at:
>>     >> http://trac.osgeo.org/proj4js/,  create a new ticket and add a
>>     patch as
>>     >> an
>>     >> attachment.
>>     >>
>>     >> Mike
>>     >>
>>     >>
>>     >
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>>
>>     --
>>     View this message in context:
>>    
>> http://n2.nabble.com/Adding-Projection-Classes-to-Proj4js-tp3324145p4136564.html
>>
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