code: public static GridCoverage2D buildDummyCoverage() {
          HashMap<String, Double> envelopeParams = new HashMap<String, Double>();
          envelopeParams.put(NORTH, 1.0);
          envelopeParams.put(SOUTH, 0.0);
          envelopeParams.put(WEST, 0.0);
          envelopeParams.put(EAST, 1.0);
          envelopeParams.put(XRES, 1.0);
          envelopeParams.put(YRES, 1.0);
          envelopeParams.put(ROWS, 1.0);
          envelopeParams.put(COLS, 1.0);
          double[][] dataMatrix = new double[1][1];
          dataMatrix[0][0] = 0;
          WritableRaster writableRaster = createWritableRasterFromMatrix(dataMatrix, true);
          return buildCoverage("dummy", writableRaster, envelopeParams, DefaultGeographicCRS.WGS84); //$NON-NLS-1$
      }
docs: Creates a useless {@link GridCoverage2D} that might be usefull as placeholder.
  
  @return the dummy grod coverage.