code: public static void dumpLasFolderOverview( String folder, CoordinateReferenceSystem crs ) throws Exception {
          SimpleFeatureTypeBuilder b = new SimpleFeatureTypeBuilder();
          b.setName("overview");
          b.setCRS(crs);
          b.add("the_geom", Polygon.class);
          b.add("name", String.class);
          SimpleFeatureType type = b.buildFeatureType();
          SimpleFeatureBuilder builder = new SimpleFeatureBuilder(type);
  
          DefaultFeatureCollection newCollection = new DefaultFeatureCollection();
  
          OmsFileIterator iter = new OmsFileIterator();
          iter.inFolder = folder;
          iter.fileFilter = new FileFilter(){
              public boolean accept( File pathname ) {
                  return pathname.getName().endsWith(".las");
              }
          };
          iter.process();
  
          List<File> filesList = iter.filesList;
  
          for( File file : filesList ) {
              try (ALasReader r = new LasReaderBuffered(file, crs)) {
                  r.open();
                  ReferencedEnvelope3D envelope = r.getHeader().getDataEnvelope();
                  Polygon polygon = GeometryUtilities.createPolygonFromEnvelope(envelope);
                  Object[] objs = new Object[]{polygon, r.getLasFile().getName()};
                  builder.addAll(objs);
                  SimpleFeature feature = builder.buildFeature(null);
                  newCollection.add(feature);
              }
          }
  
          File folderFile = new File(folder);
          File outFile = new File(folder, "overview_" + folderFile.getName() + ".shp");
          OmsVectorWriter.writeVector(outFile.getAbsolutePath(), newCollection);
      }
docs: Dump an overview shapefile for a las folder.
  
  @param folder the folder.
  @param crs the crs to use.
  @throws Exception