Sorry for the layout of my first mail, I didn't turn off the Rich-Text Editor...
Dear all,
I hope you are all doing fine. This is my first posting and I'm not that
familiar with GIS in general so please, be indulgent ;).
I have been using Geotools library for the past month, looking through the
userguide, this mailing list and some other websites but I have reached a dead
end. I'm using Geotools 13.0 with Maven through Eclipse and GDAL/OGR 1.11.1
My issue : I can't manage to display a NITF file as a layer of my mapcontent.
I have added the gt-imageio-ext-gdal jar to my pom.xml and succeeded in
displaying the gridcoverage. Here's my source code:
File file = JFileDataStoreChooser.showOpenFile("", null);
GridCoverage2DReader reader = new NITFReader(file);
AbstractGridFormat format = GridFormatFinder.findFormat( file );
GridCoverage2DReader reader = format.getReader(file);
GridCoverage2D gc = (GridCoverage2D) reader.read(null);
gc.show();
(This code is working and it displays the NITF file in a default viewer, so it
means that my gdal importation should be fine. Besides, I get "GDAL Native
Library loaded (version: 1.11.1)" in the stack trace)
However, when I try to build a layer and add it too a mapContent as it is
explained in the imageLab, I get either nothing, or a nullPointerException
depending of the way of building the layer. Here is my source code:
File file = JFileDataStoreChooser.showOpenFile("", null);
AbstractGridFormat format = GridFormatFinder.findFormat( file );
GridCoverage2DReader reader = format.getReader(file);
GridCoverage2D gc = (GridCoverage2D) reader.read(null);
//creating a default raster style
StyleBuilder sb = new StyleBuilder();
RasterSymbolizer raster = sb.createRasterSymbolizer();
Style rasterStyle = sb.createStyle(raster);
final MapContent map = new MapContent();
Layer rasterLayer = new GridReaderLayer(reader, rasterStyle);
map.addLayer(rasterLayer);
JMapFrame.showMap(map);
With this code, my JMapFrame is displayed but remains blank. I have checked the
corners coordinates with gdalinfo to be sure to get the right envelope. I
didn't get any error in the stack trace and the NITF file has everything( CRS,
Color table (Gray))
Another method was to create the layer through this way : Layer rasterLayer =
new GridCoverageLayer(gc, rasterStyle);
In this case, I get this error:
avr. 20, 2015 10:27:55 PM it.geosolutions.imageio.gdalframework.GDALUtilities
loadGDAL
INFOS: GDAL Native Library loaded (version: 1.11.1)
2015-04-20T22:27:57.803+0200 WARNING null
java.lang.NullPointerException
at
org.geotools.renderer.lite.gridcoverage2d.GridCoverageRenderer.renderImage(GridCoverageRenderer.java:386)
at
org.geotools.renderer.lite.gridcoverage2d.GridCoverageRenderer.paint(GridCoverageRenderer.java:962)
at
org.geotools.renderer.lite.gridcoverage2d.GridCoverageRenderer.paint(GridCoverageRenderer.java:924)
at
org.geotools.renderer.lite.StreamingRenderer$RenderRasterRequest.execute(StreamingRenderer.java:3485)
at
org.geotools.renderer.lite.StreamingRenderer$PainterThread.run(StreamingRenderer.java:3654)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
2015-04-20T22:27:57.803+0200 SEVERE null
java.lang.NullPointerException
at
org.geotools.renderer.lite.gridcoverage2d.GridCoverageRenderer.renderImage(GridCoverageRenderer.java:386)
at
org.geotools.renderer.lite.gridcoverage2d.GridCoverageRenderer.paint(GridCoverageRenderer.java:962)
at
org.geotools.renderer.lite.gridcoverage2d.GridCoverageRenderer.paint(GridCoverageRenderer.java:924)
at
org.geotools.renderer.lite.StreamingRenderer$RenderRasterRequest.execute(StreamingRenderer.java:3485)
at
org.geotools.renderer.lite.StreamingRenderer$PainterThread.run(StreamingRenderer.java:3654)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
This method lead me to think that the layer building wasn't right. I though
that it could come from the style and I have tried it with the styles presented
in the tutorial : createGreyScale and createRGBStyle but nothing changed.
I tried another way of displaying it by saving the map in a jpeg file as it is
shown here : http://docs.codehaus.org/display/GEOTDOC/01+GTRenderer (it worked
with a geotiff file but not with my NITF file)
I would be so grateful if you could help me to figure out this problem. The
NITF sample can be found here :
http://www.gwg.nga.mil/ntb/baseline/software/testfile/Nitfv2_1/scen_2_1.html
(it is the i_3001a.ntf file)
I would like to keep the layer-adding pattern to display it because it would
allow me to draw features layer on it.
Guillaume
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