Python pyproj converting from wgs84 to Israel Grid IG 05/12 EPSG:6991

Geographic Information Systems Asked by user88351 on May 8, 2021

I am trying to convert from lat/long to xy in Israel Grid 05/12:

links (

I tried this :
p = pyproj.Proj("+init=ESPG:6991") using python package pyproj but it is not defined yet.

File "_proj.pyx", line 84, in _proj.Proj.__cinit__ (_proj.c:1170)
RuntimeError: no system list, errno: 2

What is the proj code or definition string to use instead (perhaps in the format like the previous network?

+proj=tmerc +lat_0=31.73439361111111 +lon_0=35.20451694444445 +k=1.0000067 +x_0=219529.584 +y_0=626907.39 +ellps=GRS80 +towgs84=-48,55,52,0,0,0,0 +units=m +no_defs ?

One Answer

The proj4 library has an error identifying the difference between Israel TM Grid 2039 and IG 05/12 6991. Survey if Israel made a horrendous error and updated 2039 to include the new 7 parameter Coordinate Frame transformation, instead of the previous 3 parameter Molodansky, and left 6991 without the new and correct transformation.

I've created the correct 6991 grid, using the official parameters published by Survey of Israel

+proj=tmerc +lat_0=31.7343936111111 +lon_0=35.2045169444445 +k=1.0000067 +x_0=219529.584 +y_0=626907.39 +ellps=GRS80 +towgs84=-24.002400,-17.103200,-17.844400,-0.33077,-1.852690,1.669690,5.424800 +units=m +no_defs

You can check for yourself here.

Edit 2019: I've changed the X-rotation parameter from -0.33009 to -0.33077, as is shown in the official mapping regulations, even though Esri programs still use the former, probably wrong, parameter.

Answered by HDunn on May 8, 2021

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