Useful for quick visualization of a GeoTrellis layer written to S3. By specifying a low (re: closer to zero, say 4) zoom level, the processing should be quite quick.

Usage: gt-stitch --bucket <string> --prefix <string> --layer <string> --zoom <integer> [--tiff <string>] [--extent <string>]
Turn a GeoTrellis layer into a GeoTiff
Options and flags:
    --help
        Display this help text.
    --bucket <string>
        S3 bucket.
    --prefix <string>
        Path to GeoTrellis layer catalog.
    --layer <string>
        Name of the layer.
    --zoom <integer>
        Zoom level of the layer to stitch.
    --tiff <string>
        Name of the TIFF to be output.
    --extent <string>
        Extent to bound the layer query (LatLng).

If --tiff is not supplied, the output TIFF will be named stitched.tiff.

If --extent is not supplied, the entire layer will be queried.