[Proj] proj and Dutch RD

Martin Vermeer martin.vermeer at hut.fi
Wed Jan 11 10:14:01 EST 2006

On Wed, 2006-01-11 at 15:31 +0100, Roger Oberholtzer wrote:
> I am trying to use proj on a Dutch project using 'RD'. I have
> encountered a problem.
> I am trying the command:
> 	cs2cs -r +proj=latlong +ellps=WGS84 +to +proj=stere
> +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.9999079
> +x_0=155000 +y_0=463000 +ellps=bessel +units=m +no_defs
> This is based on the definition is the 'esri' file for item 28922.
> The X/Y values I get are not correct (according to our contact). I have
> attached a small set of values, which contains:
> 	latitude and longitude in degrees (WGS84)
> 	easting and northing according to our contact
> 	easting, northing and altitude from cs2cs with command line shown above
> I have stuck to cs2cs for this to eliminate any programming error on my
> part (other than the command line).
> I have a configuration file for this from my contact. It looks like
> this, which is pretty much what I wave on the command line. 
> 	PROJCS["Rijksdriehoekstelsel_New",
> 	GEOGCS["GCS_Amersfoort",
> 	DATUM["D_Amersfoort",
> 	SPHEROID["Bessel_1841",6377397.155,299.1528128]],
> 	PRIMEM["Greenwich",0],
> 	UNIT["Degree",0.0174532925199432955]],
> 	PROJECTION["Double_Stereographic"],
> 	PARAMETER["Scale_Factor",0.9999079],
> 	PARAMETER["False_Easting",155000],
> 	PARAMETER["False_Northing",463000],
> 	PARAMETER["Central_Meridian",5.38763888888889],
> 	PARAMETER["Latitude_Of_Origin",52.15616055555555],
> 	UNIT["Meter",1]]
> The 'PARAMETER' items match my command line. I am not sure about the
> others, like the DEGREE unit and the Bessel values.


cs2cs -r +proj=latlong +ellps=bessel +to +proj=stere
+lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.9999079
+x_0=155000 +y_0=463000 +ellps=bessel +units=m +no_defs

I assume that your given lat, long coordinates are already on Bessel ;-)

- Martin

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