I have instance my Mapcontext like this:
MapContext map=new DefaultMapContext();
Can you tell me how, i can instance the object MapContext to take
the geographic (lat-lon)???
Ndefo Kamgne Arnauld
Cité Ettayour,Immeuble Bolbol 1,Appartement A2,Ariana
0021624249357
--- En date de : Mar 8.6.10, Michael Bedward <[email protected]> a
écrit :
De: Michael Bedward <[email protected]>
Objet: Re: [Geotools-gt2-users] geotool+coordinate latitude, longitude
À: "arnauld ndefo" <[email protected]>
Cc: [email protected]
Date: Mardi 8 juin 2010, 3h39
Hello Arnauld,
> i have understood what you have told me. But you haven't understood my
> anxiety.
I think I have :-)
> I will take a example.
> When i want to draw a LineString to this coordinate:
> Coordinate coord1 = new Coordinate(10.1623439,36.8545816)
> Coordinate coord2 = new Coordinate(10.1703396,36.8531219);
> ;( 10.1623439 is the latitude of a node in my file .xml and 36.854581 is the
> longitude.)
> The JMAPFRAME don't display this LineString
> But when i do this:
> Coordinate coord1 = new Coordinate(1131270.8550,4418856.9693);
> Coordinate coord2 = new Coordinate(1131439.2747,4418792.6636);
> the line is display with the JMapFrame. I don't know what is the unit
> of 1131270.8550,4418856.96 and
> how can i do to have all the coordinate geographic in my file .xml to this
> format.
How are you initializing the MapContext that you pass to JMapFrame ?
>From the above, you have set the coordinate reference system (CRS) of
the MapContext to be something other than geographic (lat-lon).
Please note, if you do not set a CRS for your MapContext directly, it
will be set automatically to that of the first layer that you add that
has a non-null CRS.
It appears that your MapContext is working with some projected
coordinate system (UTM for instance) with units in metres. It will
still display your features created with lat-lon coordinates by
automatically reprojecting them to the CRS of the MapContext.
Please have a look at this example app which will help you to
understand the mechanisms...
http://docs.geotools.org/stable/userguide/examples/crslab.html
Michael
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