[Chameleon] (no subject)

[Paul Spencer]

That's more or less what I was proposing, although point projects  
become expensive when you do 400x400 of them.  I was thinking of  
having a grid spacing or 10 or 20 pixels but that could be tweaked.

I'd also like to see someone try the proj.js stuff from MapBuilder to  
do on-the-fly reprojection

Cheers

Paul

On 30-Nov-05, at 9:05 PM, Abe Gillespie wrote:

> Paul,
>
> Can you use libproj to "reverse project?"  If so, it's conceivable you
> can make your grid of lat / lon values on the fly (maybe that's what
> you're saying).  I wouldn't think it'd be too computing intensive to
> make the resolution of your grid the same as the pixel res of your
> image.  Interpolating from this would give you a very close
> approximation.
>
> -Abe
>
> On 11/30/05, Paul Spencer <pspencer at dmsolutions.ca> wrote:
>> Kevin,
>>
>> unfortunately there is no way to do this right now.  There are a
>> couple of possibilities:
>>
>> 1) integrate the work Mike Adair has done on MapBuilder in porting
>> Proj to javascript (yes, really!) ... depending on the projection you
>> are using, it may be possible to convert coordinates on the fly
>>
>> 2) create a grid of known lat-lon values for the current view and use
>> it to interpolate the current lat-lon.
>>
>> Cheers
>>
>> Paul
>>
>> On 30-Nov-05, at 8:40 PM, Kevin Flanders wrote:
>>
>>> We are using the cursor coordinates widget...and
>>> wondering.......can the output be set to Lat/Long even though the
>>> project projection is something else?  Our clients are familiar
>>> with Lat/Long....even though their maps look strange when set to
>>> Lat/Long.
>>>
>>>
>>>
>>> Kevin
>>> _______________________________________________
>>> Chameleon mailing list
>>> Chameleon at lists.maptools.org
>>> http://lists.maptools.org/mailman/listinfo/chameleon
>>
>> +-----------------------------------------------------------------+
>> |Paul Spencer                           pspencer at dmsolutions.ca   |
>> +-----------------------------------------------------------------+
>> |Applications & Software Development                              |
>> |DM Solutions Group Inc                 http://www.dmsolutions.ca/|
>> +-----------------------------------------------------------------+
>>
>>
>>
>>
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>
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+-----------------------------------------------------------------+
|Paul Spencer                           pspencer at dmsolutions.ca   |
+-----------------------------------------------------------------+
|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
+-----------------------------------------------------------------+