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Java port of the Proj.4 library for coordinate reprojection

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It looks like there is a set of outstanding PRs agains https://github.com/dwins/proj4j which were never merged / ported into this codebase. This task is to track backports progress.

enhancement
help wanted

I would like to point out the mistake from ticket #25 again. The conversion from 4326 to 5514 works correctly, but in the opposite direction (5514 -> 4326) the calculation...

bug

This may be a naive and ill-informed pipe dream, but it would be nice to have robust conversions from WKT{1|2} to Proj4 in cases where there's no embedded EPSG code....

enhancement
help wanted

We recently faced an issue using PROJ4J as our PROJ String wasn't recognized properly by the PROJ4J parser. Here is a Scala snippet illustrating the issue ``` scala> import geotrellis.proj4._...

enhancement

Because degrees have a value of 1, the following test passes ```kotlin val degrees = Units.DEGREES val metres = Units.METRES val metresPerUnit = Units.convert(1.0, degrees, metres) assertThat(metresPerUnit, `is`(1.0)) ``` I...

In case a bit corrupted proj4 string passed (i.e. `“+proj=merc +a=6378137 +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m +nadgrids=@null +wktext +no_defs”1` instead of the correct `“+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0...

bug
enhancement

It would be great to be able to run all or most of the PROJ.4 unit tests against Proj4J. It appears that the current testing framework for PROJ.4 uses a...

Hi, Were trying to upgrade to this library from `lib:proj4j:0.1.0` due to a bug we found that was fixed [here](https://github.com/Proj4J/proj4j/commit/56e12318b29fdbb4c7561ca8a7bcb8c8a90ee555). We have code that transforms from `EPSID:3857` to `4326`by using...

Moving discussion here from #12. With a broader goal of starting to more closely track changes with proj over the last year or two, proj4j would need to eventually start...

What should the process be for starting to think about incorporating proj’s 5.0 overall API changes (in addition to the testing changes being addressed by #9)? It seems like proj4j...