Ok, Michael,
I execute class and the result was similar to this site,
http://www.daftlogic.com/projects-google-maps-area-calculator-tool.htm
I think it must be correct.
I got some exceptions:
org.opengis.referencing.FactoryException: Failed to connect to the EPSG
database.
Caused by: org.postgresql.util.PSQLException: Connection denied
Caused by: java.net.ConnectException: Connection refused: connect
org.opengis.referencing.FactoryException: Failed to connect to the EPSG
database.
But, show the result.
Is it normal ?
From: [email protected]
To: [email protected]
Subject: RE: [Geotools-gt2-users] how to calculate area of a polygon by
coordinates
Date: Fri, 9 Sep 2011 11:48:48 +0000
Ok, Michael,
I execute class and the result was similar to this site,
http://www.daftlogic.com/projects-google-maps-area-calculator-tool.htm
I think it must be correct.
I got some exceptions:
org.opengis.referencing.FactoryException: Failed to connect to the EPSG
database.
Caused by: org.postgresql.util.PSQLException: Connection denied
Caused by: java.net.ConnectException: Connection refused: connect
org.opengis.referencing.FactoryException: Failed to connect to the EPSG
database.
But, show the result.
Is it normal ?
> Date: Fri, 9 Sep 2011 13:25:29 +1000
> Subject: Re: [Geotools-gt2-users] how to calculate area of a polygon by
> coordinates
> From: [email protected]
> To: [email protected]
> CC: [email protected]
>
> Hi Thiago,
>
> > Sorry for bother you again.
> >
> > This is correcte implementation:
> > private static CoordinateReferenceSystem getDefaultCRS() {
> > return DefaultGeographicCRS.WGS84;
> > }
>
> No. That method (in the class we talked about off-list) should return
> a CRS that you want to be the default for area calculations. You
> convert the WGS84 coordinates into this projection. E.g. in the
> previous example, with the AreaFromLatLons class, we used the South
> America Albers Equal Area Conic projection.
>
> > More question, the result is in meters ?
> >
>
> Yes, in the example code the result is in square metres. The CRS you
> choose for calculations defines the distance unit. If you look at the
> WKT definition for the CRS used in the example you will see this:
>
> // UNIT["Meter",1],
>
> Hope that helps, but if you have more questions or code snippets that
> you want to check please feel free to post them to the list - that's
> what it is here for :)
>
> Michael
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