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Add ellipsoidal orthographic projection #397

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kbevers opened this issue Jul 7, 2016 · 4 comments
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Add ellipsoidal orthographic projection #397

kbevers opened this issue Jul 7, 2016 · 4 comments
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enhancement good first issue Issues that offers a good place to start for new contributors help wanted wontfix

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@kbevers
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kbevers commented Jul 7, 2016

As mentioned by Noel Zinn on the mailing list, the orthographic projection is only implemented in the spherical case. In the pdf below Noel describes the ellipsoidal orthographic projection.

http://www.hydrometronics.com/downloads/Ellipsoidal%20Orthographic%20Projection.pdf

PJ_ortho.c should be updated accordingly.
@kbevers kbevers added help wanted good first issue Issues that offers a good place to start for new contributors labels Mar 23, 2018
@kbevers kbevers mentioned this issue Mar 28, 2018
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@Felix-neko
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Felix-neko commented Aug 15, 2018 •
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Still nobody implemented it? It would be an extreamely great and useful feature, especially in radar modeling software... And for calculating ballistic and space trajectories too...

@kbevers
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kbevers commented Aug 15, 2018

Still nobody implemented it? It would be an extreamely great and useful feature, especially in radar modeling software... And for calculating ballistic and space trajectories too...

No. If this is important to you, you can always do it yourself. I am happy to help you with that. If that is not an option to you, I am sure we can find a developer who would do the work for if you are willing to pay for the hours put into this.

@carbonox-infernox
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Seems like the gnomonic projection is also spherical based on my tests here:
https://github.com/pyproj4/pyproj/issues/388

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stale bot commented Jan 8, 2020

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

@stale stale bot added the wontfix label Jan 8, 2020
@stale stale bot closed this as completed Jan 15, 2020
rouault added a commit to rouault/PROJ that referenced this issue Sep 25, 2020
@rouault
Implement ellipsoidal formulation of +proj=ortho (fixes OSGeo#397)
73cd965 
- Map ESRI 'Local' to +proj=ortho when Scale_Factor = 1 and Azimuth = 0
- Map ESRI 'Orthographic' to a PROJ WKT2 'Orthographic (Spherical)'
  which maps to +proj=ortho +f=0 to froce spherical evaluation
rouault added a commit to rouault/PROJ that referenced this issue Sep 25, 2020
@rouault
Implement ellipsoidal formulation of +proj=ortho (fixes OSGeo#397)
1e63bd3 
- Map ESRI 'Local' to +proj=ortho when Scale_Factor = 1 and Azimuth = 0
- Map ESRI 'Orthographic' to a PROJ WKT2 'Orthographic (Spherical)'
  which maps to +proj=ortho +f=0 to froce spherical evaluation
rouault added a commit to rouault/PROJ that referenced this issue Sep 25, 2020
@rouault
Implement ellipsoidal formulation of +proj=ortho (fixes OSGeo#397)
9b75a58 
- Map ESRI 'Local' to +proj=ortho when Scale_Factor = 1 and Azimuth = 0
- Map ESRI 'Orthographic' to a PROJ WKT2 'Orthographic (Spherical)'
  which maps to +proj=ortho +f=0 to froce spherical evaluation
rouault added a commit to rouault/PROJ that referenced this issue Sep 26, 2020
@rouault
Implement ellipsoidal formulation of +proj=ortho (fixes OSGeo#397)
2e104e0 
- Map ESRI 'Local' to +proj=ortho when Scale_Factor = 1 and Azimuth = 0
- Map ESRI 'Orthographic' to a PROJ WKT2 'Orthographic (Spherical)'
  which maps to +proj=ortho +f=0 to froce spherical evaluation
rouault added a commit that referenced this issue Sep 30, 2020
@rouault
Merge pull request #2361 from rouault/ortho_ellipsoidal
1cd25bb 
Implement ellipsoidal formulation of +proj=ortho (fixes #397)
@rsbivand rsbivand mentioned this issue Jul 17, 2021
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@Felix-neko @kbevers @carbonox-infernox