EMMA

The Ecotope-Map Maker based on Abiotics (EMMA) facilitates the translation from hydrodynamic model output data to ecotope maps. Ecotopes are ecological units that are defined by abiotic, biotic, and anthropogenic local conditions. An ecotope is a more-or-less homogeneous natural unit. In many instances, the word habitat is used where here the word ecotope is used, as habitat originally refers to the living environment of a single species, while ecotope refers to an ecosystem as it can be mapped.

This simple python-interface allows to map aquatic ecotopes (or habitats) based on the abiotic output from an hydrodynamic model. It does so by a modified version of the ZES.1 classification system. The hydrodynamic model must contain the following three hydrodynamic parameters to do so:

1. water depth (or, bottom and water level);
2. flow velocity; and
3. salinity.

Some basic usage of EMMA is presented below (Basic usage). A more complete overview of use-cases are grouped in the examples-folder.

Authors

Gijs G. Hendrickx (Delft University of Technology).

Soesja Brunink (Arcadis).

Contact: [email protected].

References

When using this repository, please cite accordingly:

Hendrickx, G.G., and Brunink, S. (2023). EMMA: Ecotope-Map Maker based on Abiotics. 4TU.ResearchData. Software. doi: 10.4121/0100fc5a-a99c-4002-9864-3faade3899e3.

License

This repository is licensed under Apache License 2.0.

Installation

This repository has the following requirements (see also requirements.txt):

• Python>=3.9
• netCDF4
• numpy
• shapely
• typer
• xarray
• matplotlib [examples, optional]

Instead of installing netCDF4, the xarray-package can also be installed with the I/O-option enabled:

python3 -m pip install xarray[io]

For further details, see the xarray-documentation; also for further details on installing xarray.

As of now, EMMA is not available via PyPI and can only be installed via GitHub. Below, there are three ways presented on how to install EMMA via GitHub. All these methods require you to have your virtual environment activated. If you have no virtual environment yet, consider creating one (official documentation):

python3 -m venv <venv>

After installation, run the following command to test if EMMA and her dependencies are installed properly:

emma test

This should return the following message:

EMMA and her dependencies are installed properly.

Install directly

EMMA can be installed using pip directly:

1. Install EMMA-repository using its HTTPS-hyperlink:

   python3 -m pip install git+https://github.com/ghendrickx/EMMA.git
   

Clone repository

EMMA can be cloned according to the GitHub-instructions (note that you need to have git on your computer):

1. Open the command-line (or Git Bash on Windows), and change the directory to the desired location (using cd)
2. Clone the repository by typing git clone followed by EMMA's HTTPS-hyperlink:

   git clone https://github.com/ghendrickx/EMMA.git
   

3. Locally install EMMA:

   python3 -m pip install .
   

   Or, when storing EMMA at a different location from the virtual environment:

   python3 -m pip install /path/to/EMMA
   

Download ZIP

EMMA can be downloaded as a ZIP-file and unpacked locally:

1. Click on the Code-button on the main page and choose the Download ZIP-option
2. Check your Downloads-folder and extract the downloaded ZIP-file (EMMA-master.zip)
3. Move the repository-folder to the desired location [optional]
4. Locally install EMMA:

   python3 -m pip install .
   

   Or, when storing EMMA at a different location from the virtual environment:

   python3 -m pip install /path/to/EMMA
   

Basic usage

The basic usage of EMMA requires calling the map_ecotopes()-function:

from src.processing import map_ecotopes

results = map_ecotopes('<hydrodynamic_output_data_file>.nc', wd='<working/directory>')

There is also the option to use EMMA from the command line directly:

emma run hydrodynamic_output_data_file.nc --wd working/directory

Note that the latter usage provides limited customisation. Call for the included features:

emma run --help

By default, EMMA expects the relevant hydrodynamic variables to be named as given by dfm1.json. In case these key-words differ in the provided netCDF-file (dependent on the hydrodynamic modelling software used), provide a custom (partially overwriting) *.json-file with the same key-words as in dfm1.json; see the config-folder for an elaborate explanation on how to customise the configuration of EMMA.

In the examples-folder, a collection of examples are provided on how to use EMMA including some of her additional features. A dummy output-file is added that can be used to test the examples. For the examples, there is also an additional README in the examples-folder to provide some background to the examples, where needed. Note that these examples all make use of the Python-based execution of EMMA.