[Proj] So close -- Lat / Long to Pennsylvania State Plane North NAD27

[Jeremy Boecker]

Ok, I finally got it. I had to build the "conus" file from "conus.lla"
using nad2bin.exe. After doing this, I get the correct output instead of
asterisks and zeros. Thanks everyone for your assistance, and hopefully
this thread is of use to future users. Now that I know this works, I'm on
to my main goal of writing a VBA function in Microsoft Access that'll
provide the same results...


On Thu, Aug 8, 2013 at 11:20 AM, Jose Gonçalves <jagoncal at gmail.com> wrote:

> Jeremy
>
> I think your installation of PROJ is OK. I get the same result with the
> command line (I omitted some parts which are not needed):
>
> echo -75.921819 41.295735 |cs2cs +proj=latlong +datum=NAD27 .... +to
> +init=epsg:32028
> 2502332.66      416669.38 0.00
>
> The problem is, I think, with the command line. The input system is
> geographical coordinates in the Clarke 66 ellipsoid, so in the NAD27 datum.
> The output is a LCC projection, also based on the NAD27 datum. There is no
> datum transformation, so using +nadgrids is irrelevant. Your command is
> doing only a map projection, that you could also do with proj command:
>
> echo -75.921819 41.295735 | proj +init=epsg:32028
> 2502332.66      416669.38
>
> In your message you refer the NAD27 to WGS84 transformation, so it is
> likely that your input coordinates are WGS84 geographical. In that case you
> should use the command:
>
> echo -75.921819 41.295735 | cs2cs +init=epsg:4326 +to +init=epsg:32028
> 2502234.97      416637.87 0.00
>
> This result is much closer to what you were expecting (distance of less
> than 1 metre).
>
> > should return
> >
> > 2502235.76228      416637.89162
>
> I hope this helps
> Regards
>
> José Gonçalves
>
>
>
>
>
>
> 2013/8/8 Jeremy Boecker <jeremy.boecker at gmail.com>
>
>> Guys, I've tried everything suggested here in multiple variations, even
>> to the point of rebuilding from the source code following the instructions
>> in the FAQ, and I'm still getting the same output as is shown in my
>> previous reply to this thread. I'm not sure what the difference is between
>> what I'm doing and what Andre (one of the previous replies) is doing to be
>> able to get the correct results. Would anyone be willing to give me a
>> detailed step-by-step, starting with downloading "
>> http://download.osgeo.org/proj/proj446_win32_bin.zip" and unzipping in a
>> windows environment (I placed everything in C:\proj). See Andre's post
>> above for the inputs and outputs. The second set of output coordinates is
>> exactly what I need to get, but my output is just zeros and asterisks.
>> Thanks so much folks for your help... I feel like I'm just missing
>> something simple...!
>>
>>
>> On Sun, Jul 28, 2013 at 6:03 PM, Mikael Rittri <
>> Mikael.Rittri at carmenta.com> wrote:
>>
>>>  I think you don't have the grid shift files that are required for
>>> the Proj.4 default datum shift between NAD27 and WGS84.
>>> The files are called alaska and conus, and NTv2.gsb for
>>> Canada, and should be in the "nad" directory I think.
>>> The US files can require an extra manual command to
>>> generate, if you build Proj.4 yourself.
>>>
>>> You can read more about this on the Proj.4 FAQ.
>>>
>>>  Best regards,
>>>
>>>  Mikael Rittri
>>> Carmenta
>>> Sweden
>>> http://www.carmenta.com
>>>
>>> 26 jul 2013 kl. 20:50 skrev "Jeremy Boecker" <jeremy.boecker at gmail.com>:
>>>
>>>   Thank you, I tried what you said, and what I'm getting as output is
>>> as follows when I run the same batch file:
>>>
>>>  WGS84-NAD27
>>> *       * 0.000
>>> WGS84-NAD27PAft
>>> *       * 0.000
>>> NAD27-NAD27PAft
>>> 2502332.66      416669.38 0.000
>>>
>>>  I'm thinking my EPSG definitions might be messed up somehow... but I
>>> also tried copying from <http://spatialreference.org>
>>> spatialreference.org, and still I get the same output. (It seems like
>>> the 4326 EPSG is not working... )  Any further ideas? Your second result is
>>> the correct and expected conversion result... not sure why I'm getting
>>> asterisks and zeros for the same command! :/ Thanks again for your help!!
>>>
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