[mapguide-dev] Coordinate Transform

[Bruce Dechant]

Greg,

 

You can use the coordinate system API to do coordinate system
transformations. If PROJ4 does not recognize your state plane you will
have to update it.

Here is some sample code for doing a coordinate system transformation:
(This is taken right from the open source unit test code)

 

    try

    {

        MgCoordinateSystemFactory factory;

        STRING ogcWkt1 = ProjectedWkt_GAW;

        Ptr<MgCoordinateSystem> coordinateSystemSource =
factory.Create(ogcWkt1);

        CPPUNIT_ASSERT(coordinateSystemSource);

 

        STRING ogcWkt2 = GeographicWkt_LL84;

        Ptr<MgCoordinateSystem> coordinateSystemTarget =
factory.Create(ogcWkt2);

        CPPUNIT_ASSERT(coordinateSystemTarget);

 

        Ptr<MgCoordinateSystemTransform> transform = new
MgCoordinateSystemTransform(coordinateSystemSource,
coordinateSystemTarget);

        CPPUNIT_ASSERT(transform);

 

        MgCoordinateXY coord(410983.2513, 1415115.971);

        Ptr<MgCoordinate> pCoord = transform->Transform(&coord);

        CPPUNIT_ASSERT(MgUtil::ValuesEqual(-84.46, pCoord->GetX()));

        CPPUNIT_ASSERT(MgUtil::ValuesEqual(33.89, pCoord->GetY()));

    }

    catch(MgException* e)

    {

        STRING message = e->GetDetails(TEST_LOCALE);

        SAFE_RELEASE(e);

        CPPUNIT_FAIL(MG_WCHAR_TO_CHAR(message.c_str()));

    }

    catch(...)

    {

        throw;

    }

 

 

Bruce

 

  _____  

From: Knight, Gregory [mailto:Gregory.Knight.bra at cityofboston.gov] 
Sent: September 28, 2006 10:55 AM
To: dev at mapguide.osgeo.org
Subject: [mapguide-dev] Coordinate Transform

 

Hi all,

 

I am new to both this list and the mapguide development environment.

 

I need to transform a lat-long coordinate received from a geocoding
service (like that returned from geocoder.us in the mapguide
dotnetviewer sample) to our local state plane system (MA-NAD83-F).


How might I go about this with the least amount of pain? Do I need to
use the GDAL/PROJ libraries?  Can I do this inside my development
environement with the mapguide api?  


Any advice is appreciated.

 

Thanks,


Greg

  _____  



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