[postgis-users] Modify PCS Units

[Paul Ramsey]

Add a +to_meter parameter to your proj4 definition, that might nail
it. I'm not sure specifying +units actually does any math.

P

On Tue, Aug 3, 2010 at 10:48 AM,  <Robert_Clift at doh.state.fl.us> wrote:
> Good afternoon all:
>
> I'm working on a project in which I feed parameters to our intern for input
> into R. She's using the spatstat package to do some point pattern analysis.
> I'll enable PL/R and incorporate her code once she's got the method for
> returning distance and density plots neatly nailed to the floor. Here's my
> issue:
>
> The plots she's returned from the sample data I've provided are measured in
> units of meters or square meters. I thought it would be simple to customize
> our standard projection (Florida Albers - EPSG 3086) to return point pairs
> in miles instead of meters. I've been striking out and hope someone can
> point out what I'm doing wrong. I've tried many variations on:
>
> INSERT INTO public.spatial_ref_sys (srid, auth_name, auth_srid, srtext,
> proj4text)
> VALUES
> (
> 104307,
> 'NONE',
> 104307,
>         'PROJCS["NAD83 / Florida GDL Albers",
>         GEOGCS["GCS_North_American_1983",
>                 DATUM["D_North_American_1983",
> SPHEROID["GRS_1980",6378137,298.257222101]],
>         PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],
>
> PROJECTION["Albers_Conic_Equal_Area"],PARAMETER["False_Easting",248.548],
>         PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",-84],
>
> PARAMETER["Standard_Parallel_1",24],PARAMETER["Standard_Parallel_2",31.5],
>
> PARAMETER["Latitude_Of_Origin",24],UNIT["Mile_US",1609.347218694438]]',
> '+proj=aea +lat_1=24 +lat_2=31.5 +lat_0=24 +lon_0=-84 +x_0=248.548 +y_0=0
> +a=3963.19 +rf=298.2533112582781456953642384106 +units=mi'
>
> );
>
> I converted the False_Easting value to miles and added the '+a' and '+rf'
> switches as a last-ditch fix to no avail. Thanks in advance for your advice.
>
> Cheers,
> Rob
>
> Robert E. Clift
> Florida Department of Health
> Division of Health Access & Tobacco
> 4025 Esplanade Way, Room 330B
> Tallahassee, FL 32311
> Phone: 850.245.4444 ext 2471
> Fax: 850.414.6470
>
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