[Proj4j] ESPG:28992

[jeff fitzgerald]

Hey Martin,

There just seems to be a big discrepancy for me between proj and proj4j.

Using the string with the tows84 method and 5.387638889,52.156160556 as my
test point,
- Proj gives me 154976.16420640881,463086.51164757559
- proj4j gives me x = 4761867.817294979 y = 2527483.7229957823

Does anyone else get similar results?

Thanks.

Fitz

On Tue, Jan 10, 2012 at 1:13 AM, Martin Davis <mtnclimb at gmail.com> wrote:

> Some more information on this issue.
>
> The addition of the towgs84 parameter happened last August, as a result of
> this ticket:
>
> http://trac.osgeo.org/proj/ticket/96
>
> The SVN version of EPSG:28992 has the +towgs parameter, whereas the
> version in the PROJ.4 distro archive does not.
>
> Apparently this change was due to user demand, for what is a apparently a
> more accurate definition.  If you search for "EPSG:28992" you'll find lots
> of discussion about this.  This blog post seems to be authoritative on the
> subject:
>
>
> http://oegeo.wordpress.com/2008/05/20/note-to-self-the-one-and-only-rd-projection-string/
>
> Out of curiousity, what are the issues that you're seeing with this new
> definition?
>
>
> On Mon, Jan 9, 2012 at 8:16 AM, <jeffery.fitzgerald at gmail.com> wrote:
>
>> Hey,
>>
>> I noticed that the epsg file that ships with proj4j has a different entry
>> for ESPG:28992 than I have seen in proj.
>>
>> proj4j epsg
>> # Amersfoort / RD New
>> <28992> +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889
>> +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel
>> +towgs84=565.417,50.3319,465.552,-0.398957,0.343988,-1.8774,4.0725 +units=m
>> +no_defs <>
>>
>> gdal epsg
>> # Amersfoort / RD New
>> <28992> +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889
>> +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel +units=m +no_defs <>
>>
>> Does anyone know why? It was causing me some trouble until I removed the
>> towgs84.
>>
>>
>>
>>
>
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