Re: [Geotools-devel] CRS - "Bursa wolf parameters required."

[Paul R. <pr...@re...>]

I've populated NAD83 and NAD27 entries in the properties files with=20
TOWGS84[0,0,0] and TOWGS84[-9.0,151.0,185.0] respectively. It's rough=20
and ready, but better than a failure. Looking forward to the epsg=20
database!
P.

On 14-Mar-05, at 9:00 PM, Martin Desruisseaux wrote:

> Rueben Schulz a =E9crit :
>>>> Martin Wrote:
>>>> ----
>>>> A quick hack is to add "TOWGS84[0,0,0]" in the BC ALBERS WKT. I =
know
>>>> that I posted a mail against "TOWGS84[ all 0 ]" is a previous mail,=20=

>>>> but
>>>> Rueben explained that it is okay in the specific case of NAD83 to
>>>> WGS84. However, similar issues may popup again with other CRS.
>>>> ---
>> It is not a hack here. NAD83 and WGS84 are both modern, earth centred
>> datums and are almost equivalent (only different by a few cm I =
think).
>> TOWGS84[0,0,0] are the correct parameters for the bursa-wolf method=20=

>> for
>> this shift (aka geocentric transformation (epsg 9603)). The only way =
I
>> know of to get better accuracy than this is to hire a surveyor.
>
> Oups! I'm still learning. Thank for the clarification.
>
> 	Martin.