merc projection changing lat_0 has no effect

[percy]

http://topomaps.usgs.gov/drg/mercproj/index.html

The way I read this is that you can ONLY change longitude, and that 
latitude is fixed at the equator. And the opposite holds true for 
Transverse Mercator...

Happy to be corrected if this is not the case :-)

I typically use Albers Equal Area and shift the lat/lon settings for 
maps of larger regions...


Ryan Ollerenshaw wrote:
> I am trying to reproject my map which is in the geographic projection
> 4326 to a Mercator projection, which works, however, when i change
> lat_0 to anything it has no effect.  I can change lon_0 and the images
> shifts appropriatly but for some reason lat_0 has no effect.
> 
> -Thank you.
> 

-- 
David Percy
Geospatial Data Manager
Geology Department
Portland State University
http://gisgeek.pdx.edu
503-725-3373