projection lon_0

[jan hartmann]

John Bolster wrote:
> Hi all,
>
> Thanks to all of you who have helped me so far.
>
> I'm attempting to reproduce the projection used by the Census Bureau in
> their Tiger map browser. It's a sinusoidal projection, but it appears to be
> centered at the center of the rendered map each time rather than having one
> origin. If I set my projection to sinu and manually set lon_0 to the same as
> the map center it looks right, but I want lon_0 to automatically follow the
> map center.
>
> Is there any value I can pass in the url to set the lon_0 each time? I've
> tried &map_projection_lon_0= and it doesn't work. Any ideas?
>
> Thanks,
> John
>
Hi John,

You have to specify the complete projection string as part of the URL:

&map_projection=proj=sinu,lon_0=...

HTH

Jan