ArcGrid Plugin

The arcgrid module in the plugin group provides access to the ARC/INFO ASCII GRID raster format defined by ESRI and used in that company’s software suites.

This is a straightforward plugin with no additional information needed beyond that advertised by the GridCoverageExchange API.

Please note that this format is well suited to data exchange; especially when considered as a text file is is obviously not suited to high performance.

The arcgrid plugin supports:

• Normal GridFormatFinder use:

  File f = new File("ArcGrid.asc");
  // Reading the coverage through a file
  AbstractGridFormat format = GridFormatFinder.findFormat( f );
  GridCoverage2DReader reader = format.getReader(f);
  
  GridCoverage2D gc = reader.read(null);
  

  This is the preferred approach as it allows your code to remain format independent.

• Direct use for reading from a file:

  File f = new File"arcgrid/spearfish.asc.gz");
  
  GridCoverageReader reader = new ArcGridReader(f);
  GridCoverage2D gc = (GridCoverage2D) reader.read(null);
  

• Reading the gzipped coverage through an ImageInputStream:

  ImageInputStream iiStream = ImageIO.createImageInputStream(
         new GZIPInputStream(new FileInputStream(f)));
  GridCoverageReader reader = new ArcGridReader(iiStream,hints);
  GridCoverage2D gc = (GridCoverage2D) reader.read(null);
  

• Reading the gzipped coverage through an InputStream:

  GridCoverageReader reader = new ArcGridReader( new GZIPInputStream(
          new FileInputStream(f)),hints);
  GridCoverage2D gc = (GridCoverage2D) reader.read(null);
  

• Reading the gzipped coverage through a URL:

  GridCoverageReader reader = new ArcGridReader( f.toURI().toURL(),hints);
  GridCoverage2D gc = (GridCoverage2D) reader.read(null);