[Proj] where is the default origin ?

Glynn Clements glynn at gclements.plus.com
Wed Apr 28 15:31:27 EST 2010

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>

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