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

[Mark Cheyne]

problem solved - a little counter-intuitive, but I
have to place the +nadgrids at the end:

cs2cs -v +proj=latlong +datum=NAD83 +to +proj=lat
long +datum=NAD83 +nadgrids=wi -w5

Since it is the input coord sys that is in
NAD83HPGN(WI), I thought the +nadgrids should go to
the left of the +to, but not so.

Well, thanks for letting me bore y'all.  ;-) MC


--- Mark Cheyne <cheynm at yahoo.com> 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.
> 
> Mark
> 
> --- Mark Cheyne <cheynm at yahoo.com> wrote:
> 
> > 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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> 
>      
>
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Mark Cheyne
(608) 332-2235 (cell)


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