Re: OpenMap to WMS co-ordinates

Hi Jeff,

If you make OpenMap use the LLXY projection, that is the EPS 4326
projection that is commonly used for WMS servers - the decimal
degree/pixel ratio is the same, and constant, in both directions. So,
you can just do arithmetic to calculate the coordinate in the middle of
the box. Calculating latitude is pretty straight-forward, but you have
to watch out for the date line when calculating longitude.

Hope this helps,

Don

On Thursday, April 4, 2002, at 05:49 PM, Jeff Kirby wrote:

> Greetings all :)
>
> I'm useing Openmap as a WMS map server. The problem I've run into is
> converting the BBOX parameter into a useable Openmap co-ordinate set.
> All the constructors i see in openmap projections are Lat Lon and
> scale.. which i don't have :(
>
> Any ideas?
>
> Jeff
>
>
> --
> [To unsubscribe to this list send an email to "majdart@bbn.com"
> with the following text in the BODY of the message "unsubscribe
> openmap-users"]
>
>

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, BBN Technologies, dietrick@bbn.com
10 Moulton Street, Cambridge, MA 02138
617-873-3031 [fax]-2794
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

--
[To unsubscribe to this list send an email to "majdart@bbn.com"
with the following text in the BODY of the message "unsubscribe openmap-users"]