U-SQL Extractor and Outputter to split GeoTIFF rasters into smaller chunks.

Register the SplitTiff assembly together with its managed dependencies BitMiracle.LibTiff.NET40 and System.IO.Compression. Here are some sample GeoTIFFs that can be used as inputs.

Following snippet will split the input @in into chunks of 1000 x 1000 and create a zip output @out.

NOTE: U-SQL Outputters currently lack the feature of outputting multiple files with dynamic names hence we have to use ZipOutputter.

REFERENCE ASSEMBLY [BitMiracle.LibTiff.NET40];
REFERENCE ASSEMBLY [System.IO.Compression];
REFERENCE ASSEMBLY SplitTiff;

DECLARE @in string = "/input.tif";
DECLARE @out string = "/output.zip";

@tiff_chunks =
    EXTRACT tiff byte[]
    FROM @in
    USING new SplitTiff.SplitTiffExtractor(1000, 1000);

OUTPUT @tiff_chunks
TO @out
USING new SplitTiff.ZipOutputter("out_{0}.tiff");

{0} will become chunk Id inside the zip archive.

The SplitTiff.Console app allows you to split files using CLI.

SplitTiff.Console.exe input.tiff output_{0}.tiff