[Proj] ACT Standard Grid (AGD66)

[Andre Joost]

Am 14.04.2015 um 02:18 schrieb Richard Greenwood:
> On Mon, Apr 13, 2015 at 11:39 AM, Hermann Peifer <peifer at gmx.eu> wrote:

>> ,
>> so you should use
>>
>> +towgs84=-129.19,-41.21,130.73,.25,.37,.33,-2.96
>>
>
> If you reverse the sign then shouldn't it be:
>
> +towgs84=129.19,41.21,-130.73,-.25,-.37,-.33,2.96
>
> or am I missing what you are suggesting?
>

Only the rotations have to be reversed. The first three are shifts, and 
the last one is a scale factor. These remain unchanged.

HTH,
André Joost