[PROJ] Conversion from Tanzanian ARC1960 to WGS84

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[PROJ] Conversion from Tanzanian ARC1960 to WGS84

Jean Louis
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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Re: 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 <[hidden email]> 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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Re: Conversion from Tanzanian ARC1960 to WGS84

Jean Louis
* Alan Snow <[hidden email]> [2019-06-03 02:57]:
> 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

Thank you, good to know the link and facts.

echo -1.47666 34.56861 | cs2cs -f %.10f "Arc 1960" WGS84
-1.4792594337   34.5693813904 0.0000000000

echo -1.47666 34.56861 | cs2cs 'epsg:4210' 'epsg:4326' -f "%.10f"
-1.4792594337   34.5693813904 0.0000000000

I am getting so far quite same result.

Jean
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