Support for EPSG:31287 projection

[fichtennadel]

Please add support for Support for EPSG:31287 projection (Bessel 1841 in Lambert_Conformal_Conic_2SP projection)

proj4 Parameters:
+proj=lcc +lat_1=49 +lat_2=46 +lat_0=47.5 +lon_0=13.33333333333333 +x_0=400000 +y_0=400000 +ellps=bessel +towgs84=577.326,90.129,463.919,5.137,1.474,5.297,2.4232 +units=m +no_defs

[fichtennadel]

In the meantime I've created an EPSG:31287 projection module myself, using jhlabs Java Map Projection Library (which is doing all of the work actually).
I would like to contribute this to JOSM, please let me me know how to. Source is available at ​http://drop.io/9c7j4k3

[stoecker]

I think this should be implemented as plugin due to the usage of external library.

[bastiK]

One Problem is the size of the external lib. JOSM binary is already 4.7 MiB and every significant increase has to be clearly justified. I've looked at the jmapproj code and it's quite minimalistic - so this might be the best candidate for full (proj.4 like) projection support in JOSM core. However the library is new, incomplete and unstable, so there is no reason to rush things here.

Another problem is the Apache 2.0 license which is compatible with GPL v3 but not with GPL v2. Since JOSM source is licensed under "GPL v2 or any later version", we would have to keep these files clearly separated from the rest of the code, which is a little inconvenient.

Yes, it's tempting to have comprehensive projection support, but we have to weight the costs. So maybe the best would be a plugin, for now.

[fichtennadel]

I've created a (very basic) plugin prototype, see ​http://wiki.openstreetmap.org/wiki/WikiProject_Austria/geoimage.at#JOSM_Plugin (sorry, currently only in German language).

[bastiK]

You can make it available to all users in the plugin list within JOSM:

• simply add a link to this list: ​http://josm.openstreetmap.de/wiki/Plugins?action=edit
• plugin should have file extension *.jar
• you need to host it somewhere it can be downloaded directly
• i suggest you fix the Manifest a little:
  • Plugin-Date: ${version.entry.commit.date - remove entry
  • Plugin-Icon: - set icon or remove entry
  • Plugin-Description: - extend description a little

[fichtennadel]

Thanks for your suggestions, I've changed the Manifest a little bit.

I have submitted the plugin "epsg31287" to the JOSM SVN Repository, distributing updates should be easier that way.

[stoecker]

Why do you have such a complicated way for the new projection? Simply adding the projection to JOSM projection list should be much better in my eyes.

[fichtennadel]

Replying to stoecker:

Why do you have such a complicated way for the new projection? Simply adding the projection to JOSM projection list should be much better in my eyes.

Please advise, how can I add to "public static Projection[] allProjections" in org.openstreetmap.josm.data.projection.Projection? Is there another object / method to do this?

[stoecker]

I thought there has been changes to allow external projection to be added in the past. If not, please provide a patch to fix this. Something like a "addProjection()" function. We need this in any case, but I thought it is already there.

[joshdoe]

Replying to stoecker:

I thought there has been changes to allow external projection to be added in the past. If not, please provide a patch to fix this. Something like a "addProjection()" function. We need this in any case, but I thought it is already there.

I would like to see this as well. I'd like to add the Virginia State Plane North projection for working with PDFs I have, and it's not entirely clear to me how to integrate a new projection into JOSM.

[bastiK]

Please open anther ticket. If if it doesn't require external libraries or data files, you can simply write a patch that integrates it into main JOSM. Otherwise we'll find a solution, it should be rather simple to add such a interface for plugins.

[stoecker]

In [3872/josm]:

see #5532 - add missing addProjectsions() function nobody seems able to add when asked to do so

[stoecker]

Fixed the plugin in [o25262].