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doc Add data format description for demand vector Sep 3, 2019
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README.rst Update pip install instructions. May 18, 2018 Require pandas >0.17 May 18, 2018


iomb - Input-Output Model Builder

iomb is an open source Python library for creating environmentally extended input-output models (EEIO models) from CSV files in a simple data format. It includes functions to calculate different result types (e.g. life cycle assessment results, direct and upstream contributions, etc.) from such models and convert them into JSON-LD data packages that can be imported into openLCA.


iomb is tested with Python 3.5 but should also work with older versions of Python 3. The easiest way to install the package is to do so using pip, which is generally packaged with a Python installation. Open up the command line and enter:

pip install IO-Model-Builder

This will also install the dependencies of the IO-Model-Builder (NumPy, pandas, and matplotlib) if required. After this you should be able to use the iomb package in your Python code. To uninstall the package, you can again use pip from the command line:

pip uninstall IO-Model-Builder


You can find a more detailed example here in form of a Jupyter notebook which is a convenient way to use iomb. The following script shows the basic usage of iomb. For detailed information about the data format see the data format specification

import iomb

# optionally show all logging information of iomb

# create a direct requirements coefficients matrix from a supply and use table
# and save it to a CSV file
drc = iomb.coefficients_from_sut('supply_table.csv', 'use_table.csv')

# create an EEIO model from a coefficients matrix, satellite tables, and a
# LCIA method
model = iomb.make_model('drc.csv',
                        ['satellite_table1.csv', 'satellite_table2.csv'],
                        ['LCIA_factors1.csv', 'LCIA_factors1.csv'])

# validate the model
import iomb.validation as val
vr = validation.validate(model)

# calculate results for a given demand
result = iomb.calculate(model, {'1111a0/oilseed farming/us': 1})

# export the model to a JSON-LD package
import iomb.olca as olca


This project is in the worldwide public domain, released under the CC0 1.0 Universal Public Domain Dedication.

Public Domain Dedication

Public Domain Dedication


Please cite as: Srocka, M. and W. Ingwersen (2017). IO Model Builder, v1.1 (or current version). US Environmental Protection Agency.

A brief description of the iomb is also included in: Yang, Y., Ingwersen, W.W., Hawkins, T.R., Srocka, M., Meyer, D.E., 2017. USEEIO: A New and Transparent United States Environmentally-Extended Input-Output Model. Journal of Cleaner Production 158, 308-318. DOI: 10.1016/j.jclepro.2017.04.150

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