Re: [Mapbuilder-proj] [Developers] gml spec: point XY or YX

[Cameron S. <cam...@gm...>]

mapbuilder-proj,

It is embarrassing for me to admit that I didn't know the order of 
coordinates is not consistent.

Does the CSCS library provide a function which tells you which order a 
particular projection is in?

Eric Lam wrote:
> Hello all,
>
> I just had an interesting chat with Chris Schmidt the OpenLayers main 
> coordinator and Cameron.
>
> it appears the gml spec does not specify if a point is defined as xy 
> or yx.
> <gml:point>x-value y-value</gml:point> or
> <gml:point>y-value x-value</gml:point>
>
> Most sources use the following:
> - unprojected values we order as latitude longitude (which is y x)
> but if we are talking about
> - projected values we order as x y.
> But there is no easy way to tell if the source is projected or 
> unprojected.
>
> However, that is only what MOST sources do, some sources may give 
> projected values as y x.
> It all depends on the source ... quite ridiculous. Something that may 
> need to be taken into account.
>
> Regards,
> Eric Lam
>
>


-- 
Cameron Shorter
Systems Architect, http://lisasoft.com.au
Tel: +61 (0)2 8570 5050
Mob: +61 (0)419 142 254