[Proj] Re: Trouble with a projection

Spencer Cox spencer.cox at tesera.com
Tue Aug 29 18:19:19 EDT 2006

Please disregard that email.

I found an old post which listed:

> +proj=
> +lat_1=
> +lat_2=
> +lat_0=
> +lon_0=
> +x_0=
> +y_0=
> +lonc=
> +alpha=
> +k=
> +ellps=
> +datum=
> +units=
> +no_defs
> no_defs

I still don't know what a few of those are, but I was able to get my 
case to work using lat_1 lat_2 and lat_0.  It would be a nice reference 
to know exactly what each of those entries stands for and what 
constitutes a valid variable for each parameter.  It probably exists but 
I couldn't find it...  Just for configuring mapserver anyways...


Spencer Cox wrote:
> Good afternoon,
> Total newbie to proj... warning...danger...etc.
> I am trying to use the following projection file in a MS4W mapfile.  
> To do so I have added it to the espg file in the proj libraries.  This 
> seems to almost be working as below but I the reference latitute isn't 
> included.  How would I modify that ESPG file entry to include a 
> reference parallel.  Alternatively is there a resource would outlines 
> all the variables you can use in such a file?  I don't even 
> necessarily need to use the fake ESPG number in ESPG file combo.  Is 
> there a resource that specifies all the parameters you can use to 
> define a projection in a map file?
> #<ESPG Entry>
> <20851> +proj=lcc +lat_0=9.930000 +lon_0=-84.333333 +k_0=1 
> +x_0=499784.42 +y_0=271970.62 +ellps=clrk66 +units=m +no_defs  no_defs <>
> #</ESPG Entry>
> Summarized:
> *Lambert Norte*
> Projection: Lambert Conic Conformal
> Spheroid: Clarke 1866
> Central Meridian: -84.33333...
> Reference Latitude: 10.466666...
> Standard Parallel1: 9.93
> Standard Parallel2: 11
> False Easting: 499784.42
> False Northing: 271970.62
> From Esri File:
> PROJCS["Cost Rica 
> Norte",GEOGCS["GCS_Clarke_1866",DATUM["D_Clarke_1866",SPHEROID["Clarke_1866",6378206.4,294.9786982]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",499784.42],PARAMETER["False_Northing",271970.62],PARAMETER["Central_Meridian",-84.33333333333333],PARAMETER["Standard_Parallel_1",9.93],PARAMETER["Standard_Parallel_2",11.0],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",10.46666666666667],UNIT["Meter",1.0]] 
> Thanks for your help.

Spencer Cox - GIS Specialist
Tesera Systems Inc.
Tel: (403) 932-0440
Mailing Address: Box 1078, Cochrane AB, T4C 1B1
Street Address: Suite #6 118 Railway St. West, Cochrane AB T4C 2C2
Web: www.tesera.com

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