[Proj] Re: datum shifting - cs2cs build or config problem?

[Paul Kelly]

On Mon, 28 Jan 2008, Mark Cheyne wrote:

> I get the same result from nad2nad as I get from
> NADCON and WISCON:
>
> C:\proj>nad2nad -i 83 -i hpgn=WI -o 83 -w5
> -89.8 44.166666667
> 89d48'0.00849"W 44d9'59.99715"N
>
> But as reported below, I get something else from
> cs2cs:
>
>> C:\proj>cs2cs +proj=latlong +ellps=GRS80
>> +datum=NAD83
>> +nadgrids=wi +to +proj=latlong
>> +ellps=GRS80+datum=NAD83
>> -89.8 44.166666667
>> 89d47'59.992"W  44d10'0.003"N 0.000
>
> I've tried noodling with my syntax, any suggestions
> would be appreciated.

Have you tried dropping the +datum=NAD83 from the first co-ordinate system 
description? This implies a datum setting of +towgs84=0,0,0, and your 
+nadgrids=wi may be getting ignored.

Just an idea.

Paul