示例#1
0
  @Override
  public ElevationProvider setCacheDir(File cacheDir) {
    if (cacheDir.exists() && !cacheDir.isDirectory())
      throw new IllegalStateException("Cache path has to be a directory");

    this.cacheDir = cacheDir;
    return this;
  }
示例#2
0
  @Override
  public double getEle(double lat, double lon) {
    lat = (int) (lat * precision) / precision;
    lon = (int) (lon * precision) / precision;
    int intKey = calcIntKey(lat, lon);
    HeightTile demProvider = cacheData.get(intKey);
    if (demProvider == null) {
      if (!cacheDir.exists()) cacheDir.mkdirs();

      String fileDetails = getFileString(lat, lon);
      if (fileDetails == null) return 0;

      int minLat = down(lat);
      int minLon = down(lon);
      demProvider = new HeightTile(minLat, minLon, WIDTH, precision);
      cacheData.put(intKey, demProvider);
      try {
        String zippedURL = baseUrl + "/" + fileDetails + "hgt.zip";
        File file = new File(cacheDir, new File(zippedURL).getName());
        InputStream is;
        // get zip file if not already in cacheDir - unzip later and in-memory only!
        if (!file.exists()) {
          for (int i = 0; i < 2; i++) {
            try {
              downloader.downloadFile(zippedURL, file.getAbsolutePath());
              break;
            } catch (FileNotFoundException ex) {
              // now try with point if mirror is used
              zippedURL = baseUrl + "/" + fileDetails + ".hgt.zip";
              continue;
            }
          }
        }

        is = new FileInputStream(file);
        ZipInputStream zis = new ZipInputStream(is);
        zis.getNextEntry();
        BufferedInputStream buff = new BufferedInputStream(zis);
        byte[] bytes = new byte[2 * WIDTH * WIDTH];
        DataAccess heights = getDirectory().find("dem" + intKey);
        heights.create(bytes.length);

        demProvider.setHeights(heights);
        int len;
        while ((len = buff.read(bytes)) > 0) {
          for (int bytePos = 0; bytePos < len; bytePos += 2) {
            short val = BIT_UTIL.toShort(bytes, bytePos);
            if (val < -1000 || val > 10000) {
              // TODO fill unassigned gaps with neighbor values -> flood fill algorithm !
              // -> calculate mean with an associated weight of how long the distance to the
              // neighbor is
              //                            throw new IllegalStateException("Invalid height value "
              // + val
              //                                    + ", y:" + bytePos / WIDTH + ", x:" + (WIDTH -
              // bytePos % WIDTH));
              val = Short.MIN_VALUE;
            }

            heights.setShort(bytePos, val);
          }
        }
        // demProvider.toImage(file.getName() + ".png");
      } catch (Exception ex) {
        throw new RuntimeException(ex);
      }
    }

    short val = demProvider.getHeight(lat, lon);
    if (val == Short.MIN_VALUE) return Double.NaN;
    return val;
  }