Re: [Geotools-gt2-users] CRS of this map context is null. Unable to get bounds.

[Ajay R. <aja...@gm...>]

Hey Greg

Usually CRS is null for a shapefile read through shapefiledatastore if  
it doesn't have a corresponding .prj file

You may not need to use an AuthorityFactory in that case if u can  
provide a prj file

Regards

Ajay ravichandran

On Jan 14, 2009, at 2:48 PM, Greg Ederer <gr...@er...> wrote:

> Hi,
>
> I found the answer to my own question:
>
>     CRSAuthorityFactory factory =
> ReferencingFactoryFinder.getCRSAuthorityFactory("EPSG", null);
>     CoordinateReferenceSystem crs =
> factory.createCoordinateReferenceSystem("4326");
>
> Thanks!
>
> Greg
>
> On Jan 14, 2009, at 12:40 PM, Greg Ederer wrote:
>
>> Hi,
>>
>> I am reading a shapefile using the following code from the User  
>> Guide:
>>
>> File file = new File("/Users/gregederer/servers/geoserver_data/data/
>> shapefiles/gaul/Africa/g2008_1.shp");//getShapeFile(args);
>>
>>    ShapefileDataStore shapefile = new
>> ShapefileDataStore(file.toURL());
>>    String typeName = shapefile.getTypeNames()[0];
>>    FeatureSource featureSource = shapefile.getFeatureSource();
>>    FeatureType schema = featureSource.getSchema();
>>    CoordinateReferenceSystem crs =
>> schema.getGeometryDescriptor().getCoordinateReferenceSystem();
>>
>>    MapContext map = new DefaultMapContext(crs);
>>    Style style = createStyle(file, schema);
>>    map.addLayer(featureSource, style);
>>
>>    showMap(map);
>>
>> in showMap():
>>
>>    final JMapPane mapPane = new JMapPane(new StreamingRenderer(),
>> map);
>>    mapPane.setMapArea(map.getLayerBounds());
>>
>> When I run this code against my shapefile, I get:
>>
>> Exception in thread "main" java.io.IOException: CRS of this map
>> context is null. Unable to get bounds.
>>        at
>> org
>> .geotools. 
>> map.DefaultMapContext.getLayerBounds(DefaultMapContext.java:
>> 544)
>>        at org.esv.SummaryStats.ShapeLab.showMap(ShapeLab.java:187)
>>        at org.esv.SummaryStats.ShapeLab.main(ShapeLab.java:75)
>>
>> Is it possible that this shapefile has no CRS?  If so, is there a
>> factory method that I can use to get the required
>> CoordinateReferenceSystem reference?  I happen to know that this
>> particular shapefile is in ESPG:4326.  What other parameters will I
>> need?
>>
>> Thanks!
>>
>> Greg
>>
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