[Proj] ACT Standard Grid (AGD66)

[Michel.Dastous at bentley.com]

Thank you all, after reverting the rotation values everything is fine!

Michel

-----Original Message-----
From: proj-bounces at lists.maptools.org [mailto:proj-bounces at lists.maptools.org] On Behalf Of Andre Joost
Sent: Monday, April 13, 2015 11:52 PM
To: proj at lists.maptools.org
Subject: Re: [Proj] ACT Standard Grid (AGD66)

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


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