[Proj] Egypt Datum Transformation Parameters
support.mn at elisanet.fi
support.mn at elisanet.fi
Wed Aug 27 15:05:50 EDT 2008
Hello,
there seems to be some entries in EPSG database
which have also a datum defined. Here are them:
# epsg.pin:4706
# Egypt Gulf of Suez S-650 TL
proj=longlat
ellps=helmert
towgs84=-146.21,112.63,4.05,0,0,0,0
no_defs
# epsg.pin:3355
# Egypt Gulf of Suez S-650 TL / Red Belt
proj=tmerc
lat_0=30
lon_0=31
k=1
x_0=615000
y_0=810000
ellps=helmert
towgs84=-146.21,112.63,4.05,0,0,0,0
units=m
no_defs
There are also some other entries, but those are without
any datum shift. Those given seem to use only 3 parameters.
Spatialreference.org gives exactly the same data:
http://spatialreference.org/ref/epsg/?search=egypt&srtext=Search+EPSG+References
If nothing else helps you could always calculate your self
some datum parameters?? if you have some known
points available.
Regards: Janne.
-------------------
Irwin Scollar <al001 at uni-koeln.de> kirjoitti:
> Can anyone supply Helmert 7 parameter datum parameters between WGS84
> Ellipsoid and the Helmert 1906 Ellipsoid used in the "Red Belt, Blue
> Belt, Purple Belt, Purple Belt Extended" Old Egyptian 1907 areas or
> a link to where they may possibly be found?
>
> I have only the 3 parameter Molodensky transform data in the NIMA
> 1987 Madtran and the later Geotran2 programs which may not have
> errors as low as those of a modern dual frequency GPS receiver.
>
> Irwin Scollar
>
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