Raster I/O Simplification (RIOS)


A set of Python modules which makes it easy to write raster processing code in Python. Built on top of GDAL, it handles the details of opening and closing files, checking alignment of projection and raster grid, stepping through the raster in small blocks, etc., allowing the programmer to concentrate on the processing involved.

As of version 2.0, RIOS has strong support for parallel processing, in both reading and computation, supporting a range of paradigms. See Concurrency for details.

It is licensed under GPL 3.


Reads in two input files and adds them together.
Assumes that they have the same number of bands.
from rios import applier

# Set up input and output filenames.
infiles = applier.FilenameAssociations()
infiles.image1 = "file1.img"
infiles.image2 = "file2.img"

outfiles = applier.FilenameAssociations()
outfiles.outimage = "outfile.img"

# Set up the function to be applied
def addThem(info, inputs, outputs):
    Function to be called by rios.
    Adds image1 and image2 from the inputs, and
    places the result in the outputs as outimage.
    outputs.outimage = inputs.image1 + inputs.image2

# Apply the function to the inputs, creating the outputs.
applier.apply(addThem, infiles, outfiles)

See Applier Examples for more information.


Source code is available from GitHub. Installation from source is described in the INSTALL.txt file.

Release notes by version can be viewed in Release Notes.

Conda packages are available under the conda-forge channel. Once you have installed Conda’s installer, run the following commands on the command line to install RIOS:

conda config --add channels conda-forge
conda create -n myenv rios
conda activate myenv

RIOS is not available from the PyPI repository. This is because it depends on the GDAL library, which is also not available there, and must be installed by some other means, such as conda. If one is using conda for GDAL, one may as well use it for RIOS, too. While it is technically possible to bundle the GDAL binaries into a PyPI distribution, this carries grave risks of version conflicts if any other package does the same thing, and is best avoided.

High level functions

Low level functions

Deprecated (see version 2.0 notes)

Command Line Programs

RIOS comes with two command line programs:
  • rioscalcstats computes statistics and pyramid layers (overviews) on a file.

  • riosprintstats prints statistics information previously calculated on the file.

Refer to the helpstrings (run with -h) for usage of these programs. Note that by default, RIOS calculates pyramid layers and statistics on a file.