[Proj] where is the default origin ?

[Glynn Clements]

Randy wrote:

> I'd like to know where the default origin is when I do Mercator
> projection like this:
> from "+proj=latlong+ellps=WGS84+datum=WGS84"
> to   "+proj=merc+lat_ts=30+ellps=WGS84+datum=WGS84+unit=meter"
> 
> I just know the default origin is the point of intersection with
> greenwich and equatorial when I use the default latitude of true
> scale,but if now the latitude of true scale is decided by "lat_ts",where
> is the default origin?

It's still at the intersection of the prime meridian and the equator.

-- 
Glynn Clements <glynn at gclements.plus.com>