The answer is actually the subject of the work I did last week on geotools
trunk (MapContext Refactor) :-)
So on 2.7-SNAPSHOT you can perform an:
- layer instanceof GridCoverageLayer (loaded into memory)
- layer instanceof GridReaderLayer (direct access to disk)
Other then that I did learn what happens on 2.6.x - and the answer is that the
gridcoverage/gridreader is packaged up as a feature!
There is a method: FeatureUtilities.wrapGridCoverage(coverage)
That creates a feature using the following feature type:
SimpleFeatureTypeBuilder ftb = new
SimpleFeatureTypeBuilder(getTypeFactory());
ftb.setName("GridCoverage");
ftb.add("geom", Polygon.class, sourceCRS);
ftb.add("grid", GridCoverage.class);
SimpleFeatureType schema = ftb.buildFeatureType();
Perhaps you could test for this feature type to detect grid coverage layersin
2.6.x?
On 17/06/2010, at 2:33 AM, S Dille wrote:
>
> Hi,
> I'm pretty new to geotools, so excuse me if this is a really simple
> question, but I have searched everywhere and I can't find an answer:
>
> How can I determine if a MapLayer object contains a GridCoverage object, and
> if it does contain a GridCoverage, how can I extract it out? I am adding a
> lot of image layers to a MapContext using the
> addLayer(AbstractGridCoverage2DReader gridCoverage, Style style) method from
> the DefaultMapContext class. I am also adding Shapefiles using another some
> of the other overloaded addLayer methods. When I go back to manipulate a
> layer in which I inserted an image, I am having trouble detecting that it is
> a GridCoverage2D object that is within the MapLayer object. I can detect if
> they are shapefiles just fine. Is this something right in front of me that
> I can't see?
>
> Thanks in advance!
>
> S Dille
> --
> View this message in context:
> http://osgeo-org.1803224.n2.nabble.com/MapLayer-s-and-GridCoverage2D-s-tp5187306p5187306.html
> Sent from the geotools-gt2-users mailing list archive at Nabble.com.
>
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