OK. Now after much banging the head on the wall, I came to realize that my
code would only work if I have a .pgw (world) file along with the .png file
I get from the WMS server. Now can anyone tell me how do I make a .pgw file
from geotools or even geoserver? I am completely stuck :(
On Sun, Nov 4, 2012 at 10:36 AM, Ratnadeep Raxsith <[email protected]> wrote:
> I am trying to overlay a shp file on wms layer using the example
> http://docs.geotools.org/latest/userguide/tutorial/raster/image.html.
>
> Each time I want to read the format of the file to get a reader I get this
> error :
>
> 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:127)
> at com.qedrix.map.maplotr.Demo1.main(Demo1.java:260)
>
> My code follows:
>
> 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);
> }
>
> System.out.println(request.getFinalURL());
>
> 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);
>
> try{
> Thread.sleep(2000);
> }catch(InterruptedException e){}
>
> 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;
> }
>
> I am using Maven so my dependency is this:
>
> <dependency>
> <groupId>org.geotools</groupId>
> <artifactId>gt-shapefile</artifactId>
> <version>${geotools.version}</version>
> </dependency>
> <dependency>
> <groupId>org.geotools</groupId>
> <artifactId>gt-swing</artifactId>
> <version>${geotools.version}</version>
> </dependency>
> <dependency>
> <groupId>org.geotools</groupId>
> <artifactId>gt-epsg-hsql</artifactId>
> <version>${geotools.version}</version>
> </dependency>
> <dependency>
> <groupId>org.geotools</groupId>
> <artifactId>gt-geotiff</artifactId>
> <version>${geotools.version}</version>
> </dependency>
> <dependency>
> <groupId>org.geotools</groupId>
> <artifactId>gt-image</artifactId>
> <version>${geotools.version}</version>
> </dependency>
> <dependency>
> <groupId>org.geotools</groupId>
> <artifactId>gt-wms</artifactId>
> <version>${geotools.version}</version>
> </dependency>
> <dependency>
> <groupId>org.geotools</groupId>
> <artifactId>gt-coverage</artifactId>
> <version>${geotools.version}</version>
> </dependency>
> <dependency>
> <groupId>org.geotools</groupId>
> <artifactId>gt-imageio-ext-gdal</artifactId>
> <version>${geotools.version}</version>
> </dependency>
>
> I have JAI/ImageIO/Gdal native libs installed and using a JDK 32bit version.
>
> I am using geotools version 9-SNAPSHOT
>
> I even tested the geoserver WMS URL and it works:
>
> http://184.106.187.247:8080/geoserver/rg/wms?SERVICE=WMS&LAYERS=rg:parcels&ISBASELAYER=false&FORMAT=image/png&OPACITY=.2&HEIGHT=420&TRANSPARENT=TRUE&REQUEST=GetMap&BBOX=-13019428.542822,3922163.1648461,-13013051.407366,3929863.8567165&WIDTH=583&STYLES=&SRS=EPSG:900913&VERSION=1.1.1
>
> Just ran gdalinfo.exe to read the image content and it follows:
>
> 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
>
> Please help.
>
>
>
>
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