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I am using below codes to mosaic some raster files, but the result shows many white blocks.

Did I miss any important option to avoid this?

The codes:

        gdal.AllRegister();

        String folder = "";
        String outputFile = folder + File.separator + "result.tif";
        Collection<File> files = FileUtils.listFiles(new File(folder), new String[]{"TIF"}, false);

        List<Dataset> datasets = files.parallelStream().map(file -> {
            return gdal.Open(file.getAbsolutePath(), 0);
        }).collect(Collectors.toList());

        gdal.Warp(outputFile, datasets.toArray(new Dataset[0]), new WarpOptions(new Vector<>(Lists.newArrayList(
                "-r", "near"
        ))));
  • one of the original Tiff file:

one_of_the_original

  • The mosaiced raster tiff shows white blocks:

enter image description here

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7
  • I wonder if you have actually black pixels and nodata=0 that makes your viewer to show the pixels as transparent. We need more details about your options and perhaps sample data.
    – user30184
    yesterday
  • @user30184 I checked both the original tif and mosaiced tif, they both have nodata value as 0. and added -dstnodata 0 didn't help.
    – cinqS
    yesterday
  • What is your viewer? Does it have a tool for checking the value of those white pixels? Are they nodata (0) or white (255)?
    – user30184
    yesterday
  • @user30184 I am using an open source Qgis, yet I am not sure how to get the value from the viewer. But I can copy the coordinate with qgis, and know how to read byte array with gdal. Can I use these coordinates to get the value?
    – cinqS
    yesterday
  • Select the layer in QGIS and use the normal query tool. The name seems to be "Identify features", a small "i" as an icon.
    – user30184
    yesterday

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