[Proj] Finnish KKJ in proj 4.4.9

Martin Vermeer martin.vermeer at hut.fi
Mon Dec 12 16:01:27 EST 2005

On Mon, Dec 12, 2005 at 04:18:57PM +0100, Roger Oberholtzer wrote:
> I am exploring using proj to obtain KKJ coordinates from WGS84 lat/long
> values.  The values only get to within 176 meters of where they are
> expected to be (according to the Finnish Road Authority). Is anyone else
> using proj to obtain Finnish KKJ values?
> -- 
> Roger Oberholtzer
> OPQ Systems AB

Which are you using? I tried <2393> from the epsg file:

# KKJ / Finland Uniform Coordinate System
<2393> +proj=tmerc +lat_0=0 +lon_0=27 +k=1.000000 +x_0=3500000 +y_0=0
+ellps=intl +towgs84=-90.7,-106.1,-119.2,4.09,0.218,-1.05,1.37 +units=m
+no_defs  <>

just last week, and got within decimetres of the right values according
to the Ollikainen publication.

The command I used was

./cs2cs +proj=latlong +ellps=WGS84 +to +init=epsg:2393

The test point I use is triangulation point 158:

23d55'11.134"E  63d29'4.016"N 23.847
3346722.90 7046208.88

from Matti Ollikainen (1993): GPS-koordinaattien muuntaminen
Kartastokoordinaateiksi, pages 29-31 (Finnish Geodetic Institute)

Are you sure you are using the right zone? There are four of them,
2391-2394, three degrees apart.

- Martin Vermeer

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