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POGeotools - Draw Features on WMS and OSM
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  1. POGeotools - Draw Features on WMS and OSM
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    copied!<p>I am trying to overlay a shp file on wms layer using the example <a href="http://docs.geotools.org/latest/userguide/tutorial/raster/image.html" rel="nofollow">http://docs.geotools.org/latest/userguide/tutorial/raster/image.html</a>.</p> <p>I am continuously getting the error:</p> <pre><code>Exception in thread "main" java.lang.UnsupportedOperationException: Trying to get a reader from an unknown format. at org.geotools.coverage.grid.io.UnknownFormat.getReader(UnknownFormat.java:62) at com.qedrix.map.maplotr.Demo1.displayLayers(Demo1.java:121) at com.qedrix.map.maplotr.Demo1.main(Demo1.java:229) </code></pre> <p>when the code tries to read the WMS image.</p> <p>My code looks like this:</p> <pre><code>public class Demo1 { private AbstractGridCoverage2DReader reader = null; private StyleFactory sf = CommonFactoryFinder.getStyleFactory(); private FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(); /** * This method examines the names of the sample dimensions in the provided * coverage looking for "red...", "green..." and "blue..." (case insensitive * match). If these names are not found it uses bands 1, 2, and 3 for the * red, green and blue channels. It then sets up a raster symbolizer and * returns this wrapped in a Style. * * @return a new Style object containing a raster symbolizer set up for RGB * image */ private Style createRGBStyle() { GridCoverage2D cov = null; try { cov = reader.read(null); } catch (IOException giveUp) { throw new RuntimeException(giveUp); } // We need at least three bands to create an RGB style int numBands = cov.getNumSampleDimensions(); if (numBands &lt; 3) { return null; } // Get the names of the bands String[] sampleDimensionNames = new String[numBands]; for (int i = 0; i &lt; numBands; i++) { GridSampleDimension dim = cov.getSampleDimension(i); sampleDimensionNames[i] = dim.getDescription().toString(); } final int RED = 0, GREEN = 1, BLUE = 2; int[] channelNum = { -1, -1, -1 }; // We examine the band names looking for "red...", "green...", // "blue...". // Note that the channel numbers we record are indexed from 1, not 0. for (int i = 0; i &lt; numBands; i++) { String name = sampleDimensionNames[i].toLowerCase(); if (name != null) { if (name.matches("red.*")) { channelNum[RED] = i + 1; } else if (name.matches("green.*")) { channelNum[GREEN] = i + 1; } else if (name.matches("blue.*")) { channelNum[BLUE] = i + 1; } } } // If we didn't find named bands "red...", "green...", "blue..." // we fall back to using the first three bands in order if (channelNum[RED] &lt; 0 || channelNum[GREEN] &lt; 0 || channelNum[BLUE] &lt; 0) { channelNum[RED] = 1; channelNum[GREEN] = 2; channelNum[BLUE] = 3; } // Now we create a RasterSymbolizer using the selected channels SelectedChannelType[] sct = new SelectedChannelType[cov.getNumSampleDimensions()]; ContrastEnhancement ce = sf.contrastEnhancement(ff.literal(1.0), ContrastMethod.NORMALIZE); for (int i = 0; i &lt; 3; i++) { sct[i] = sf.createSelectedChannelType(String.valueOf(channelNum[i]), ce); } RasterSymbolizer sym = sf.getDefaultRasterSymbolizer(); ChannelSelection sel = sf.channelSelection(sct[RED], sct[GREEN], sct[BLUE]); sym.setChannelSelection(sel); return SLD.wrapSymbolizers(sym); } public void displayLayers() { File rasterFile = fetchWmsImage(); AbstractGridFormat format = GridFormatFinder.findFormat(rasterFile); this.reader = format.getReader(rasterFile); // Initially display the raster in greyscale using the // data from the first image band Style rasterStyle = createRGBStyle(); // Create a basic style with yellow lines and no fill Style shpStyle = SLD.createPointStyle("point", Color.YELLOW, Color.GRAY, 0.0f, 1.5f); MapContent map = new MapContent(); map.setTitle("ImageLab"); MapViewport vp = new MapViewport(); org.geotools.map.Layer rasterLayer = new GridReaderLayer(reader, rasterStyle); map.addLayer(rasterLayer); saveImage(map, "final.jpeg", 583); } public File fetchWmsImage() { URL url = null; try { url = new URL("http://184.106.187.247:8080/geoserver/rg/wms?version=1.1.0"); } catch (MalformedURLException e) { // will not happen } WebMapServer wms = null; try { wms = new WebMapServer(url); WMSCapabilities capabilities = wms.getCapabilities(); Layer[] layers = WMSUtils.getNamedLayers(capabilities); GetMapRequest request = wms.createGetMapRequest(); request.setFormat("image/png"); request.setDimensions("583", "420"); request.setTransparent(true); request.setSRS("EPSG:900913"); request.setBBox("-13019428.542822,3922163.1648461,-13013051.407366,3929863.8567165"); request.setProperty("isBaseLayer", "false"); request.setProperty("opacity", ".2"); for (Layer layer : WMSUtils.getNamedLayers(capabilities)) { if (layer.getName().equals("rg:parcels")) request.addLayer(layer); } GetMapResponse response = (GetMapResponse) wms.issueRequest(request); BufferedImage image = ImageIO.read(response.getInputStream()); File rasterFile = new File("C:\\Users\\samabhik\\Workspace\\MAP\\data\\out.png"); ImageIO.write(image, "png", rasterFile); return rasterFile; } catch (ServiceException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { } return null; } public void saveImage(final MapContent map, final String file, final int imageWidth) { GTRenderer renderer = new StreamingRenderer(); renderer.setMapContent(map); Rectangle imageBounds = null; ReferencedEnvelope mapBounds = null; try { mapBounds = map.getMaxBounds(); double heightToWidth = mapBounds.getSpan(1) / mapBounds.getSpan(0); imageBounds = new Rectangle(0, 0, imageWidth, (int) Math.round(imageWidth * heightToWidth)); } catch (Exception e) { // failed to access map layers throw new RuntimeException(e); } BufferedImage image = new BufferedImage(imageBounds.width, imageBounds.height, BufferedImage.TYPE_INT_RGB); Graphics2D gr = image.createGraphics(); gr.setPaint(Color.WHITE); gr.fill(imageBounds); try { renderer.paint(gr, imageBounds, mapBounds); File fileToSave = new File(file); ImageIO.write(image, "jpeg", fileToSave); } catch (IOException e) { throw new RuntimeException(e); } } public static void main(String[] args) { Demo1 demo = new Demo1(); demo.displayLayers(); } </code></pre> <p>}</p> <p>My pom dependency looks like this:</p> <pre><code>&lt;dependency&gt; &lt;groupId&gt;org.geotools&lt;/groupId&gt; &lt;artifactId&gt;gt-shapefile&lt;/artifactId&gt; &lt;version&gt;${geotools.version}&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.geotools&lt;/groupId&gt; &lt;artifactId&gt;gt-swing&lt;/artifactId&gt; &lt;version&gt;${geotools.version}&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.geotools&lt;/groupId&gt; &lt;artifactId&gt;gt-epsg-hsql&lt;/artifactId&gt; &lt;version&gt;${geotools.version}&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.geotools&lt;/groupId&gt; &lt;artifactId&gt;gt-geotiff&lt;/artifactId&gt; &lt;version&gt;${geotools.version}&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.geotools&lt;/groupId&gt; &lt;artifactId&gt;gt-image&lt;/artifactId&gt; &lt;version&gt;${geotools.version}&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.geotools&lt;/groupId&gt; &lt;artifactId&gt;gt-wms&lt;/artifactId&gt; &lt;version&gt;${geotools.version}&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.geotools&lt;/groupId&gt; &lt;artifactId&gt;gt-coverage&lt;/artifactId&gt; &lt;version&gt;${geotools.version}&lt;/version&gt; &lt;/dependency&gt; </code></pre> <p>Somewhere I read that it could a GDAL issue. But I couldn't figure out how to resolve it. I am using eclipse on 64 JDK 1.6 and Win 7 amd64.</p> <p>Please help, someone..</p> <p>Just tested the image file using gdalinfo.exe found in the GDAL native libraries path. Here's the report:</p> <pre><code>Driver: PNG/Portable Network Graphics Files: ..\..\Workspace\MAP\data\out2.png Size is 583, 420 Coordinate System is `' Image Structure Metadata: INTERLEAVE=PIXEL Corner Coordinates: Upper Left ( 0.0, 0.0) Lower Left ( 0.0, 420.0) Upper Right ( 583.0, 0.0) Lower Right ( 583.0, 420.0) Center ( 291.5, 210.0) Band 1 Block=583x1 Type=Byte, ColorInterp=Red Mask Flags: PER_DATASET ALPHA Band 2 Block=583x1 Type=Byte, ColorInterp=Green Mask Flags: PER_DATASET ALPHA Band 3 Block=583x1 Type=Byte, ColorInterp=Blue Mask Flags: PER_DATASET ALPHA Band 4 Block=583x1 Type=Byte, ColorInterp=Alpha </code></pre> <p><em>FURTHER UPDATES</em></p> <p>I just tried and changed the out format for WMS from images/png to images/geotiff and this now works partially ( the final image that is generated by geotools is Black &amp; White). Why this is happening? And why it didn't work with PNG? </p>
 

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