Raster Reader Class Table

The raster reader class table for the different image formats is as follows:

GEOTIFF

IlvRasterGeoTiffReader

DTED

IlvRasterDTEDReader

GTOPO30

IlvGTopo30Reader

Non-geo-referenced images(*)

IlvRasterBasicImageReader

Images from OpenGIS compliant Web Map 
Servers

IlvWMSReader

Creating a Raster Reader

To create a raster reader and add all image files to be read you can, for example, use the following code:

IlvRasterDTEDReader reader = new IlvRasterDTEDReader();
for(int i=0;i<fileName.length;i++) {
  reader.addMap(fileName[i]); 
}

Creating a Tiled Data Source

To create a data source for the reader:

IlvMapDataSource DTEDDataSource = IlvRasterDataSourceFactory.buildTiledImageDataSource(manager,reader,true,true,null);
DTEDDataSource.setName("name in data source panel");

Geo-referencing a Non Geo-referenced Image

To geo-reference a non geo-referenced image, you can set the longitude and latitude image bounds:

reader.setImageBounds(0,-Math.PI,Math.PI/2,Math.PI,-Math.PI/2);

Alternatively, you can compute a more complex mathematical transformation and set it on the reader:

reader.setInternalTransformation(trans);

 

   
Note
 
 

    
The non geo-referenced image reader does not support multiple calls to addMap.

 

Images from OpenGIS Compliant Web Map Servers

This section gives information about the OpenGIS® Web Map Server (WMS) Standard. This International Standard specifies the behavior of a service that produces spatially referenced maps dynamically from geographic information. It specifies operations to retrieve a description of the maps offered by a server and to query a server about features displayed on a map. The standard is not applicable to the retrieval of actual feature data or coverage data values, but is applicable to pictorial renderings of maps in a graphical format. These capabilities are provided by a Web Feature and Web Coverage Service.

In a basic WMS, only a limited number of predefined styles can be applied to features. The mechanism that enables users to define their own styles is defined in the OGC Styled Layer Descriptor Implementation Specification. An SLD-enabled WMS retrieves feature data from a Web Feature Service and applies explicit styling information provided by the user in order to render a map.

Importing a WMS Image

JViews Maps supports the import of images from a WMS server.

To create a WMS data source, use the following code:

URL url = new URL("http://geo.compusult.net/scripts/mapman.dll?
   Name=weather&REQUEST=GetCapabilities");
IlvWMSReader reader = new IlvWMSReader(url);
IlvWMSDataSource source = new IlvWMSDataSource(reader);
source.setManager(manager);