[Proj] WGS84 to NAD27 Coordinate conversion in Android

[Robb Main]

Thanks for the pointer to Apache SIS, Martin.
I was hoping to find an operational (or easily ported) Android solution,
and less of a swiss-army knife codebase.
You covered these issues in your response, and SIS / GDAL may yet prove
usefull in the eventual solution.
I'm still hopeful that there might be a simpler solution, not yet suggested
(and that I've not yet discovered).

Best regards.
Robb.




On Wed, Nov 14, 2018 at 4:19 AM Martin Desruisseaux <
martin.desruisseaux at geomatys.com> wrote:

> Hello Robb
>
> I you look for a pure Java implementation, Apache Spatial Information
> System (http://sis.apache.org/) can do this coordinate transformation.
> Apache SIS is a source of inspiration for the new PROJ version (
> https://gdalbarn.com/) in progress. Pros and cons below:
>
> Advantages:
>
>    - Strong emphasis on OGC and ISO standards, including GML, WKT 1 and
>    2, etc.
>    - Advanced features not found even in Proj.4 (late-binding
>    implementation, etc.). PROJ is catching-up with gdalbarn however.
>    - You can use it in a way that does not make you too dependent on this
>    particular implementation, through GeoAPI interfaces.
>
> Inconvenient:
>
>    - Not as many projections than Proj.
>    - Relatively large binary (~3 Mb) with many features not needed for
>    WGS84 to NAD27 UTM transformations.
>    - Depends on JAXB, which is not available by default on Android.
>    - Making sure that SIS runs on Android would probably require more
>    work.
>
> The JAR size problem may be mitigated by trimming down the classes not
> needed by your application. I think Maven Shader plugin can do that. Since
> Java 9, jlink can also do that but the result is a native binary instead
> than a portable Java Archive file. A Google Summer of Code student started
> a port of SIS to Android (e.g. removing JAXB dependencies), but this work
> has not been completed.
>
> Let me know if you wish any additional information,
>
>     Martin
>
>
>
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