[fusion-dev] A defect in ViewOptions widget?

Michael Adair madair at dmsolutions.ca
Fri Aug 5 09:30:02 EDT 2011


Arthur,

I assume you are referring to http://trac.osgeo.org/fusion/ticket/467, I 
had a quick look at that last week and my guess is that the WKT coming 
back for the pseudo-mercator is incorrect or not being parsed correctly 
but I haven't got further than that yet.

Mike

On 05/08/2011 4:22 AM, Arthur Liu wrote:
>
> Hi experts,
>
> I meet a strange problem on commercial layer based map, and I think 
> this might be a defect in ViewOptions widget.  I would like to know if 
> there's anyone else who ever met similar issues before.
>
> The map I used  is defined in Google Mercator(EPSG:900913) and it 
> works fine when I use the default unit(meter) ViewOptions.
>
> However, when I change the unit to "degree" in ViewOptions, the 
> displayed value from the CursorPosition is not correct anymore.
>
> The expected value should be (-119.9707, 40.0646), but the value I get 
> is (-120.7833,44.0925). The longitude value is acceptable while the 
> latitude value is far from the correct value.
>
> In ViewOptions widget, it simply does an unit conversion regardless 
> which coordinate system is being used. It just times 
> 0.000009044(degrees per meter pre-defined in fusion.js) based on my 
> original position value to get the result.  I have little experience 
> about coordinate system, but it seems that EPSG:900913 is flatter than 
> other WGS84 coordinate systems. Is it the cause of this issue?  Is it 
> needed for ViewOptions to enhance its function?
>
> Regards,
>
> Arthur
>
>
>
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