PyWBT: Python Wrapper for WhiteboxTools

Overview

PyWBT is a Python wrapper for the WhiteboxTools (WBT) geospatial analysis library. It simplifies geospatial workflows by providing an easy-to-use Pythonic interface while maintaining a minimal dependency footprint—relying only on Python's built-in modules.

You can try PyWBT directly in your browser by clicking the Binder badge above.

Key Features

• Lightweight Python interface for WBT’s command-line tools.
• Seamless integration with WBT for custom geospatial workflows.
• Minimal dependencies for ease of installation.
• Optional dem_utils module for obtaining and preprocessing DEM data from 3DEP (US only at 10, 30, and 60 m resolutions) and NASADEM (global coverage at 30 m resolution).

Installation

Install PyWBT via pip or micromamba:

Using pip:

pip install pywbt

Using micromamba (or conda/mamba):

micromamba install -c conda-forge pywbt

Quick Start

PyWBT enables the execution of WBT tools with the whitebox_tools function, which manages the environment setup, including downloading the WBT executable for your operating system.

Basic Usage

The whitebox_tools function requires two key arguments:

• src_dir: Directory containing the input files.
• arg_dict: Dictionary where tool names are keys and argument lists are values.

Example usage:

import pywbt
from pathlib import Path

src_dir = Path("path/to/input_files/")
wbt_args = {
    "BreachDepressions": ["-i=dem.tif", "--fill_pits", "-o=dem_corr.tif"],
    # Additional tools...
}

pywbt.whitebox_tools(src_dir, wbt_args)

For more detailed workflows and usage patterns, refer to the documentation.

Managing Output Files

To manage the output, specify which intermediate files to keep using the files_to_save argument. Only those files listed will be saved, and the rest will be deleted. By default, all files are stored in save_dir (the current working directory, by default).

Tool Lookup

Use list_tools and tool_parameters to explore available tools and their arguments. Here's an example using pandas for querying tools:

import pandas as pd

tools = pd.Series(pywbt.list_tools())
tools[tools.str.contains("depression", case=False)]

Get parameters for a specific tool:

pd.DataFrame(pywbt.tool_parameters("BreachDepressions"))

DEM Utilities

The dem_utils module supports downloading and reading DEM data from 3DEP and NASADEM. Install optional dependencies for DEM utilities:

pip install pywbt[dem]

Or using micromamba:

micromamba install -c conda-forge pywbt 'geopandas-base>=1' planetary-computer pystac-client rioxarray

Example Workflow

We can delineate the stream network and calculate the Strahler stream order for a region in London using PyWBT, as shown below:

import pywbt
from pathlib import Path

bbox = (0.0337, 51.5477, 0.1154, 51.6155)
src_dir = Path("path/to/input_files/")
pywbt.dem_utils.get_nasadem(bbox, src_dir / "dem.tif", to_utm=True)
wbt_args = {
    "BreachDepressions": ["-i=dem.tif", "--fill_pits", "-o=dem_corr.tif"],
    "D8Pointer": ["-i=dem_corr.tif", "-o=fdir.tif"],
    "D8FlowAccumulation": ["-i=fdir.tif", "--pntr", "-o=d8accum.tif"],
    "ExtractStreams": [
        "--flow_accum=d8accum.tif",
        "--threshold=600.0",
        "-o=streams.tif",
    ],
    "StrahlerStreamOrder": [
        "--d8_pntr=fdir.tif",
        "--streams=streams.tif",
        "--zero_background",
        "-o=strahler.tif",
    ],
}
pywbt.whitebox_tools(src_dir, wbt_args)

For more examples, visit the documentation.

Contributing

We welcome contributions! For guidelines, please refer to the CONTRIBUTING.md and CODE_OF_CONDUCT.md.

License

PyWBT is licensed under the MIT License. See the LICENSE file for details.