Map Projections of Switzerland

Collection by Stefan A. Voser		 MapRef
MapRef
update18. March 2001

Map Projection - CH1903+
  • Oblique Mercator by Rosenmund, 1903, on Bessel-Ellipsoid
  • Landesvermessung 1995 - LV95, Fundamental Point : Zimmerwald
  • It is a double projection:
    •   a conformal projection from the Spheroid to a Sphere (Gauss)
    •   Oblique Mercator Projection from the Sphere to the Plane.
Central Point: Old Observatory, Berne
                   Radius of Sphere  =  6378815.904 m
                   L0 (Bessel)       =   7°26'22.5"
                   B0 (Bessel)       =  46°57'08.66"

                   l0 (sphere)       =  0
                   b0 (sphere)       =  46°54'27.8"

                   Easting           =  2600000 m
                   Northing          =  1200000 m


Arc/Info Parameters (Source: Landestopographie) 
Projection        OBLIQUE_MERCATOR
Units             Meters
Spheroid          BESSEL
Datum             USER_DEFINED 674.374 15.056 405.346 0 0 0 0
Xshift            0.0000
Yshift            0.0000
Parameters
2                 /* Projection type < 1 | 2 >
1                 /* Scale factor at the projection's center
7 26 22.5         /* Longitude of the projection's center (DMS)
46 57 08.66       /* Latitude  of the projection's center (DMS)
90.000000         /* Azimuth at the projection's center
-7419820.5907     /* False easting  (meters)
 1200000.0000     /* False northing (meters)



Parameters for ESRI´s Projection Engine 
inplemented in ArcGIS 8.1, reformatted for display.

PROJCS["CH1903+_LV95",GEOGCS["GCS_CH1903+",
DATUM["D_CH1903+",
SPHEROID["Bessel_1841",6377397.155,299.1528128]],
PRIMEM["Greenwich",0],
UNIT["Degree",0.0174532925199432955]],
PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],
PARAMETER["False_Easting",2600000],
PARAMETER["False_Northing",1200000],
PARAMETER["Scale_Factor",1],
PARAMETER["Azimuth",90],
PARAMETER["Longitude_Of_Center",7.439583333333333],
PARAMETER["Latitude_Of_Center",46.95240555555556],
UNIT["Meter",1]]



Sample Data
Geographic on Bessel (CH1903+, Decimal Degree)
====================
1   7°40'10.273359"E   47°34' 6.364313"N 
2   9°47' 8.455154"E   47°31'  .215862"N 
3   9° 1'12.903078"E   45°55'54.475622"N   
4   7°36'23.846977"E   46°45'36.895817"N    
Swiss-Grid-Coordinates (in Meters)
======================
 1 2617300.62300 1268506.59600
 2 2776668.24900 1265376.04600
 3 2722590.15600 1087792.04700
 4 2612759.68800 1178654.25700



Source
  1. Urs Marti, Dieter Egger (1999): Bezugssysteme in der Praxis, Bundesamt für Landestopographie: TB99-20.
  2. Swiss Federal Office of Topography (L+T): Schweizerisches Projektionssystem - Formeln für die Umrechnung von Landeskarten in geographische Koordinaten und umgekehrt, 
MapRef
© by Stefan A. Voser
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