RE: [OpenMap Users] UTM Points

Hello Simon,
 
UTMPoint has a constructor that takes an Ellipsoid as a parameter. If
you look at the Ellipsoid class, you'll see a public final static
Ellipsoid named BESSEL_1841. You can pass that into UTMPoint.
 
All you need to do is convert each coordinate from UTM to LatLon, which
is part of UTMPoint itself. You could call the toLatLonPoint() method
of UTMPoint:
 
UTMPoint utmPoint = new UTMPoint(northing, easting, zoneNumber,
zoneLetter);
LatLonPoint newPoint = utmPoint.toLatLonPoint(Ellipsoid.BESSEL_1841);
 
 
I think that should work.
 
--Erik
 
 
Erik Oscarson
Raytheon
(703)923-2282
eoscarson@rayva.org
 

        -----Original Message-----
        From: Simon Bowen [mailto:sbowen@gammaprojects.com]
        Sent: Tuesday, July 01, 2003 10:32 AM
        To: 'OpenMap Support'; 'openmap-users@bbn.com'
        Subject: [OpenMap Users] UTM Points
        
        

        Hello,

        Could someone please point me in the correct direction in
solving this problem,

        I have an application that uses the OpenMap framework, and have
had enormous success with OpenMap over the last few months.

        I use OpenMap with MapInfo MIF files using the following layer
"com.bbn.openmap.layer.mif.MIFLayer"
        I also have some hand crafted layers where I create various
OMGraphics from data returned from an Oracle database.

        To date all of the coordinates (MIF files and from our DB) have
been in some Longitude Latitude format.

        I now have a requirement where we need to handle data from MIF
files and from the database in Easting/Nothings (UTMPoints) with various
Ellipsoids.

        I see that OpenMap has a UTMPoint class for converting between
LatLon/UTM conversions.

        My question being, is there support currently within OpenMap
where I can specify to the OpenMap framework to use say UTM with
ellipsoid Bessel_1841, or are there any people who have had to use
OpenMap with transparent support for UTM coordinate systems. Currently
the only way I can see to achieve my goal is to extend the
com.bbn.openmap.layer.mif.* package to test the MIF coordsys header and
perform the necessary UTM conversion for each coordinate in the MIF
file, plus have some conversion from my database from the UTM
coordinates into Lat/Long.

        As far as I can see (I may be wrong) OpenMap rendering only uses
Lat/Long values? Is there some property or Environment setting where I
can say all the values for OMGraphics will be eastings/northings rather
than lat/long?

        Many Thanks,

        Simon Bowen

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