[Proj] Creating a Custom EPSG Entry

Oscar van Vlijmen ovv at hetnet.nl
Wed Sep 6 13:18:36 EDT 2006

> 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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