[Proj] Creating a Custom EPSG Entry

Craig Miller craig at millerfam.net
Wed Sep 6 13:35:36 EDT 2006

I'm not 100% sure, but I think you can just pass in the WKT.  I don't think
you need to actually add the projection to the EPSG file.


-----Original Message-----
From: proj-bounces at lists.maptools.org
[mailto:proj-bounces at lists.maptools.org] On Behalf Of Oscar van Vlijmen
Sent: Wednesday, September 06, 2006 10:19 AM
To: PROJ.4 and general Projections Discussions
Subject: Re: [Proj] Creating a Custom EPSG Entry

> From: Frank Warmerdam
> Subject: Re: [Proj] Creating a Custom EPSG Entry
> Ryan Ollerenshaw wrote:
>> I am working with some Mars datasets that i want to display using 
>> MapServer so of course i need to use a projection specified in the 
>> proj4 EPSG file,

> Based on some logic I have seen in my ISIS2 format driver, it would 
> seem that "SimpleCylindrical" in this context is the same as 
> Equidistant Cylindrical (aka Equirectangular or Plate Caree).

> If we try:
> proj -I +proj=eqc +lon_0=354.60611161722 +lat_ts=0 +a=3396190 
> +b=3376190 -f "%.10f"
> -2549.695468358 -107601.7017923
> We get:
> -5.4369032875   -1.8153057930

I can add:
lon = 354.562842; lat = -1.826054;
in the ellipsoidal case, using EPSG coordinate operation method 9823.
Close, but still no cigar.

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