Re: [OpenMap Users] DTED problem

From: Don Dietrick <dietrick_at_bbn.com>
Date: Wed, 21 Dec 2005 12:45:11 -0500

Hi Denny,

The scale number is too big, the DTEDLayer thinks it shouldn't
respond to it. There's a min.scale property for the layer you can
set so that the DTEDLayer would try to respond to the request, but it
might take a while since many files would need to be read to do that.

Regards,

- Don

On Dec 21, 2005, at 12:10 PM, Denny Lee wrote:

> Hello,
> I am new to Openmap and I am trying to create a
> servlet to generate map images. The servlet code is as
> follows:
>
> package OpenMapTest;
>
> //This works!
>
> import java.io.File;
> import java.io.FileInputStream;
> import java.io.FileNotFoundException;
> import java.io.IOException;
> import java.util.Properties;
>
> import javax.servlet.ServletConfig;
> import javax.servlet.ServletException;
> import javax.servlet.UnavailableException;
> import javax.servlet.http.*;
>
> import com.bbn.openmap.Environment;
> import com.bbn.openmap.Layer;
> import com.bbn.openmap.image.*;
> import com.bbn.openmap.layer.GraticuleLayer;
> import com.bbn.openmap.layer.DateLayer;
> import com.bbn.openmap.layer.daynight.DayNightLayer;
> import com.bbn.openmap.layer.etopo.ETOPOLayer;
> import com.bbn.openmap.layer.shape.ShapeLayer;
> import com.bbn.openmap.plugin.PlugIn;
> import com.bbn.openmap.plugin.PlugInLayer;
> import com.bbn.openmap.proj.Mercator;
> import com.bbn.openmap.proj.Proj;
> import com.bbn.openmap.proj.Projection;
> import com.bbn.openmap.proj.ProjectionFactory;
> import com.bbn.openmap.util.ComponentFactory;
> import com.bbn.openmap.util.PropUtils;
>
> //http://localhost:8080/OpenMapTest/MapServlet?
> REQUEST=MAP&SCALE=500000000&LAT=32.3800&LON=-117.90&HEIGHT=600&WIDTH=8
> 00&PROJTYPE=mercator&LAYERS=date,cities,test,graticule,demo,shapePolit
> ical
> //http://localhost:8080/OpenMapTest/MapServlet?
> REQUEST=MAP&SCALE=500000000&LAT=32.3800&LON=-117.90&HEIGHT=600&WIDTH=8
> 00&PROJTYPE=CADRG&LAYERS=date,cities,test,graticule,demo,shapePolitica
> l
> //http://localhost:8080/OpenMapTest/MapServlet?
> REQUEST=MAP&SCALE=500000000&LAT=32.3800&LON=-117.90&HEIGHT=600&WIDTH=8
> 00&PROJTYPE=CADRG&LAYERS=jdted,shapePolitical
>
> public class MapServlet3 extends HttpServlet {
> //Logger logger =
> Logger.getLogger(MapServlet.class);
> Layer dateLayer;
> Layer[] layers;
> AcmeJPEGFormatter formatter = new
> AcmeJPEGFormatter();
> Properties configProperties;
> Projection defaultProjection;
> MapRequestHandler iServer;
>
>
> public void createLayers(Properties p)
> {
> dateLayer =
> makeLayer("com.bbn.openmap.layer.DateLayer", "date",
> p);
> System.out.println("DateLayer isa " +
> dateLayer.toString());
> layers = new Layer[] { dateLayer };
> }
>
>
> public Layer makeLayer(String className, String
> layerName, Properties p)
> {
> Object obj = ComponentFactory.create(className,
> layerName, p);
>
> if (obj instanceof Layer || obj instanceof
> PlugIn) {
> Layer l = null;
>
> if (obj instanceof PlugIn) {
> PlugIn pi = (PlugIn) obj;
> PlugInLayer pil = new PlugInLayer();
> pil.setPlugIn(pi);
>
> pil.setName(p.getProperty(PropUtils.getScopedPropertyPrefix(pi)
> + Layer.PrettyNameProperty));
> l = pil;
> } else {
> l = (Layer) obj;
> }
>
> return l;
> }
>
> return null;
> }
>
> //
> public void init(ServletConfig conf) throws
> ServletException {
> super.init(conf);
> String basePath =
> getServletContext().getRealPath("/");
> //String propFile = basePath +
> conf.getInitParameter("openmap.properties");
>
> String propFile = basePath +
> "openmap.properties";
> System.out.println("Requesting data from
> properties file: " + propFile);
> try {
> File f = new File(propFile);
> System.out.println("File f = " + f);
> System.out.println("exists=" +
> f.exists());
> System.out.println("readable=" +
> f.canRead());
> System.out.println("writeable=" +
> f.canWrite());
>
> FileInputStream fis = new
> FileInputStream(f);
>
> configProperties = new Properties();
>
> configProperties.load(fis);
>
>
>
> createLayers(configProperties);
>
> } catch (FileNotFoundException e) {
> System.out.println("File not found " +
> e.toString());
> throw new
> UnavailableException(e.getLocalizedMessage());
> } catch (IOException e) {
> System.out.println("IO Exception " + e.toString());
> throw new
> UnavailableException(e.getLocalizedMessage());
> }
> }
>
>
>
> public void doGet(HttpServletRequest request,
> HttpServletResponse response) throws IOException {
>
> response.setContentType("image/jpeg");
> System.out.println("in doGet " +
> request.getQueryString() );
> Properties requestProperties = new
> Properties(configProperties);
> byte[] returnImage = null;
>
> String requestParameters =
> request.getQueryString();
>
> // Add any request-specific properties here.
> byte[] image = null;
>
>
>
>
> try
> {
>
> iServer = new
> MapRequestHandler(requestProperties);
>
> returnImage =
> iServer.handleRequest(requestParameters);
>
>
>
> response.setContentLength(returnImage.length);
>
> response.getOutputStream().write(returnImage);
>
> }
> catch(Exception ex)
> {
> System.out.println("error in doGet " +
> ex.toString());
> }
> }
>
> public void destroy() {
> iServer = null;
> configProperties = null;
> super.destroy();
> }
> }
>
> I can pan, zoom and put in various layers but I can't
> bring up the DTED layer. I got as far as displaying
> dtedcov layer but I can't get the actual DTED layer.
>
> Here is the http request I have been using
>
> http://localhost:8080/OpenMapTest/MapServlet?
> REQUEST=MAP&SCALE=500000000&LAT=32.3800&LON=-117.90&HEIGHT=600&WIDTH=8
> 00&PROJTYPE=CADRG&LAYERS=jdted,dtedcov,shapePolitical
>
> I am running Openmap on Windows XP with Tomcat 5.5 and
> Java 1.5. Any help would be great. I am completely
> out of ideas. Thanks.
>
> --
> [To unsubscribe to this list send an email to "majdart_at_bbn.com"
> with the following text in the BODY of the message "unsubscribe
> openmap-users"]

--
[To unsubscribe to this list send an email to "majdart_at_bbn.com"
with the following text in the BODY of the message "unsubscribe openmap-users"]
Received on Wed Dec 21 2005 - 12:54:48 EST

This archive was generated by hypermail 2.3.0 : Tue Mar 28 2017 - 23:25:07 EDT