digdem 0.2.3

Semi-automated modification of Digital Elevation Models

digdem

• Description
• Installation
• Quick start

Description

digdem package can be used to modify semi-automatically Digital Elevation Models (or any raster data) in specific regions, using a limited number of control points and control profiles. It follows the following steps:

1. Create instance of SurfMod with initial DEM, and an array specifying where the DEM will be modified;
2. Generate controlling sections (typically longitudinal and transverse sections), and specify the new altitude of their intersections if any;
3. Add additional control points along the sections by specifying their altitude, and if needed additional control points located within the mask but not on the sections;
4. digdem then interpolates the new DEM within the mask by:
   • Interpolating splines along each section
   • Interpolating the new DEM with Radial Basis Functions, using points along the splines, points on the contour of the mask, and if applicable additional control points within the mask.
5. Plot the new topography

Note that digdem is still under development, thus only minimal documentation is available at the moment, and testing is underway. Contributions are feedback are most welcome.

Installation

digdem can be installed from GitHub, PyPi or Anaconda. Supposedly stable releases are distributed to PyPi and Anaconda. Distribution to Anaconda is made manually from the PyPi package, thus the last available version on conda-forge may be an older version than the one distributed on PyPi.

It is strongly recommended to install digdem in a virtual environnement dedicated to this package. This can be done with virtualenv (see the documentation e.g. here). Create the environnement with :

python -m venv /path/to/myenv

and activate it, on Linux:

source /path/to/myenv/bin/activate

and on Windows:

\path\to\myenv\Scripts\activate

Alternatively, if you are more used to Anaconda :

conda create -n digdem pip
conda activate digdem

or equivalently with Mamba :

mamba create -n digdem pip
mamba activate digdem

Latest stable release from Anaconda

With Anaconda:

conda install digdem

or equivalently with Mamba:

mamba install digdem

Latest stable realease from PyPi

Before installing with pip, make sure pip, steuptools and wheel are up to date

python -m pip install --upgrade pip setuptools wheel

Then run

python -m pip install digdem

Development version on from GitHub

Download the GithHub repository here, or clone it with

git clone https://github.com/marcperuz/digdem.git

Open a terminal in the created folder and type:

python -m pip install .

If you want to developp and test digdem and have your modification directly taken into account when running your code, use:

python -m pip install -e .

Alternatively, if you don't want to install the package with pip, you can also add the src folder to your Python path.

Quick start

See jupyter notebooks in examples.