code: public static WritableRandomIter getWritableRandomIterator( int width, int height ) {
          if (doesOverFlow(width, height)) {
              GrassLegacyRandomIter iter = new GrassLegacyRandomIter(new double[height][width]);
              return iter;
          }
          WritableRaster pitRaster = CoverageUtilities.createWritableRaster(width, height, null, null, null);
          WritableRandomIter iter = RandomIterFactory.createWritable(pitRaster, null);
          return iter;
      }
docs: Creates a {@link WritableRandomIter}.
  
  <p>It is important to use this method since it supports also
  large GRASS rasters.
  
  <p>If the size would throw an integer overflow, a {@link GrassLegacyRandomIter}
  will be proposed to try to save the saveable.
  
  @param raster the coverage on which to wrap a {@link WritableRandomIter}.
  @return the iterator.