Help Plugin or Update osmand+ MGRS/ UTM

[Markus Zielonka]

Hello OsmAnd team.

Your app is very good and I bought directly OsmAnd+.
So and now my question. Seeking help for a plugin MGSR UTM position input and output. In addition, the routing.

Why: Because I as a volunteer have only UTM coordinates.

Thank you.

Greetings Markus

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Hallo OSMAND Team.

Eure App ist sehr gut und ich habe mir direkt OSMAND+ gekauft.
So und nun meine Frage. Ich suche Hilfe für ein Plugin MGSR UTM Positionseingabe und Ausgabe. Zusätzlich das Routing.

Warum: Weil ich als ehrenamtlicher Helfer nur UTM Koordinaten habe.

Danke Euch.

Gruß Markus

[Marko Mäkelä]

sunnuntai, 19. tammikuuta 2014 17.57.39 UTC+2 Markus Zielonka kirjoitti:

Seeking help for a plugin MGSR UTM position input and output.

IIRC, someone from an English-speaking country asked a similar question less than a month ago, and I did not see an answer to that.
I am just a fellow user and an OSM contributor, but I have some knowledge in this area.

OsmAnd and GPS natively uses the WGS84 coordinate system. Governments around the world have defined their own coordinate systems. EPSG used to compile a list of these coordinate system. For example, one variation of the one used in Finland (KKJ, karttakoordinaattijärjestelmä) is called EPSG:2391. My old Garmin device (Edge 705) offers a list of different coordinate systems, but I never needed anything else than WGS84. I think that it should be fairly easy to support the display and input of different coordinates by linking to the PROJ.4 library.

The Military Grid Reference System (MGRS) seems to consist of multiple Universal Transverse Mercator zones. I wonder which UTM zone Germany (or the part of Germany where you operate) would belong to. You can search for UTM in the Spatial Reference list.

I guess that the new OsmAnd plugin should link to PROJ.4. The user could enter special PROJ.4 parameters in the settings, to choose how to display and input map coordinates.

Best regards,

 Marko

[Greg Troxel]

What you said sounds right to me. Other datums are becoming less
important (NAD27 used to matter a lot in the US in the 80s and early
90s, but not so much any more), but UTM and MGRS are still relevant.
Still, projection changes without datum conversion can be implemented
with proj.4, or geographiclib.

The following may be useful:

http://geographiclib.sourceforge.net/cgi-bin/GeoConvert

The author is known for a near-fanatical devotion to correctness, so
it's probably reliable.

[RobW]

I'd love to be able to see British National Grid coordinates on OsmAnd+  

Its ability to display multiple datasets is excellent, but lat long is not ideal when our maps are all BNG

Rob