[PROJ] Conversion from Tanzanian ARC1960 to WGS84

[Alan Snow]

Hi Jean,

This is not necessarily the correct answer, but it may help.
>From what I can tell, https://epsg.io/4210-1285 is the projection for
ARC1960.

$ cs2cs 'epsg:4210' 'epsg:4326' -f "%.5f"
-1.47666 34.56861
-1.47926 34.56938 0.00000

Best,
Alan


On Sat, Jun 1, 2019 at 2:02 PM Jean Louis <bugs at gnu.support> wrote:

> Hello,
>
> I would like to get possibility to convert
> programmatically from ARC1960 how it is used in
> Tanzania, to WGS84.
>
> I did read this file:
> http://lists.maptools.org/pipermail/proj/2009-August/004849.html
>
> and this thread:
> https://github.com/OSGeo/proj.4/issues/1110
>
> And I am still not getting right result.
>
> I have got the coordinate -1.47927 34.56933 from
> GEOTRANS software. And I have compared it to the
> Tanzanian mining cadastre, it is apparently the
> same.
>
> However, I am not achieving with the below
> conversion to obtain accurate coordinate.
>
> Please help me if you can, so that I find permanet
> solution, as it affects very many people who live
> in Tanzania.
>
> <gie>
>
> operation       +proj=molodensky +ellps=clrk80 +da=-112.145
> +df=-0.54750714e-4 +dx=-175 +dy=-23 +dz=-303
> tolerance       2 m
>
> accept          -1.47666 34.56861
> expect          -1.47927 34.56933
>
> </gie>
>
>
> Jean
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>


-- 
Alan Snow
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