[Proj] Receiving "pj_transform(): Unknown error" while trying to use cs2cs from rpoly to utm

[John Buonagurio]

Thanks, my thoughts as well. The calculations for this projection are very similar to the regular (American) polyconic.

I'll give it a shot - working on implementing the inverse on the sphere. Will submit via pull request.

John

-----Original Message-----
From: proj-bounces at lists.maptools.org [mailto:proj-bounces at lists.maptools.org] On Behalf Of Kristian Evers
Sent: Wednesday, September 28, 2016 3:57 AM
To: PROJ.4 and general Projections Discussions <proj at lists.maptools.org>
Subject: Re: [Proj] Receiving "pj_transform(): Unknown error" while trying to use cs2cs from rpoly to utm

I had a quick look in Yang, Snyder & Tobler and it should be fairly easy to implement the inverse projection. I've created a ticket for it: https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_OSGeo_proj.4_issues_420&d=DQIGaQ&c=t0wRGL5ICVzH157W8C8Wew&r=Q-Rs-yPWbL0-v_m_Ov9CS1uGraVrKdE4mvUkBfZ3rWE&m=9qi7q5QoQWxg6vZjCV32eGaFCcF3h2BpKvbInYryzts&s=kz8sB_TLq3wDwp1Gvttw4ZxIq8a-L40nxugvAoI-Lps&e= 



Feel free to submit a pull request!



/Kristian



> -----Oprindelig meddelelse-----

> Fra: proj-bounces at lists.maptools.org [mailto:proj-

> bounces at lists.maptools.org] På vegne af John Buonagurio

> Sendt: 27. september 2016 23:16

> Til: PROJ.4 and general Projections Discussions

> Emne: Re: [Proj] Receiving "pj_transform(): Unknown error" while trying to

> use cs2cs from rpoly to utm

> 

> Hi,

> 

> PROJ.4 only supports the forward transformation (from lon/lat to projected).

> The inverse transformation isn't implemented unfortunately for rectangular

> polyconic:

> 

> <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_OSGeo_proj.4_blob_master_src_PJ-5Frpoly.c-23L12&d=DQIGaQ&c=t0wRGL5ICVzH157W8C8Wew&r=Q-Rs-yPWbL0-v_m_Ov9CS1uGraVrKdE4mvUkBfZ3rWE&m=9qi7q5QoQWxg6vZjCV32eGaFCcF3h2BpKvbInYryzts&s=0CIu0APRS-wSnhnKpZRmHYh2htrzQNE_AQAz-wYulAg&e= >

> 

> ("no inv.")

> 

> Has anyone looked into this? The inverse is described in Yang/Snyder/Tobler.

> 

> John

> 

> 

> From: proj-bounces at lists.maptools.org [mailto:proj-

> bounces at lists.maptools.org] On Behalf Of Resnick, Jessica

> Sent: Tuesday, September 27, 2016 2:06 PM

> To: proj at lists.maptools.org

> Subject: [Proj] Receiving "pj_transform(): Unknown error" while trying to

> use cs2cs from rpoly to utm

> 

> Hi All,

> 

> I am trying to convert some points from rpoly to utm. I have tried typing

> Cartesian coordinates and cartographic coordinates and both result in the

> error:

> <cs2cs>: while processing file: <stdin>, line 1

> pj_transformation(): Unknown error

> 

> For some reason it works correctly if I go from utm to rpoly, but that is not

> what I am trying to do.

> Here is my code:

> cs2cs +proj=rpoly +lat_ts=25.066667 +lon_0=-80.636667 +ellps=bessel +to

> +proj=utm +zone 17 +ellps=WGS84

> I tried inputting:

> -80.4666667 +24.983333333

> and got:   *                  *       0.00

> 17151.59  2799896.42

> and got:    *                 *       0.00

> 

> Can anyone tell me what I am doing wrong?

> 

> Thanks!

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