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

[Mark Cheyne]

Partially solved. I quickly found one explanation - my
$PROJ_LIB was set to c:\proj, but it needed to be set
to c:\proj\nad.

So now I can run the example from the FAQ correctly.
Good sign.

However, consider this:

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

What I am trying to say is that the input point is
NAD83HPGN(WI), and I want output in NAD83. I've run
this example through both NADCON and WISCON, both give
me the same result, different from what I got above:
-89 48 0.00849  44 9 59.99715

So it probably now comes down to user error - am I not
specifying that cs2cs command line correctly?

Mark 



--- Mark Cheyne <cheynm at yahoo.com> wrote:

> I'm trying to test my proj configuration.
> 
> There is an example in the FAQ
> http://proj.maptools.org/faq.html:
> 
> cs2cs +proj=latlong +datum=NAD27 +to +proj=latlong
> +datum=NAD83 
> -117 30
> 
> producing:
> 
> 117d0'2.901"W   30d0'0.407"N 0.000
> 
> But when I try it, the following is produced:
> 
> 117dW   30dN 0.000
> 
> That is, the output is identical to the input.
> 
> I am using binaries I built myself on Windows from
> the
> 4.5 source. 
> 
> If I try the 4.4.6 binaries that are available from
> http://proj.maptools.org/ I get even worse results:
> 
> *       * 0.000
> 
> another symptom is what happens when I try to use
> nad2nad. For example:
> 
> nad2nad -i 83 -i hpgn=WI -o 83
> 
> yields:
> 
> <nad2nad>:
> hp datum file: WI, failed: No such file or directory
> program abnormally terminated
> 
> I'm pretty out of my element when it comes to
> building
> the source - merely trying to follow instructions.
> To
> do it, I used Visual Studio 2003 and the commandline
> 'nmake /f makefile.vc all' on the source located at
> c:\proj\src, and I have c:\proj\nad containing the
> *.lla grid shift files, and I also have $PROJ_LIB
> set
> to c:\proj. When the build runs, all the binary grid
> shift files get created, a good sign.
> 
> Sorry if this is old hat, but I'm not having good
> luck
> trying to search the email list archive...
> 
> A homebrew for an explanation.  ;-)  Thanks, Mark
> 
> 
>      
>
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