OTB Guided Tour : count the islands !
2021-09-27, 14:00–18:00, Nemonte Nenquimo

Orfeo ToolBox (OTB) is a reference remote sensing library, that provides tons of applications to deal with remote sensing images (satellite or UAV images) and extract valuable information into your GIS software.
This workshop is addressed to beginners with OTB, who want to start to use OTB in their own remote sensing and geomatic processings. You will manipulate a Jupyter Notebook and will learn how to use OTB Python interface, interactions with other frameworks (GDAL, Xarray, PostgreSQL), through a realistic processing chain.
During our "guided tour", you will use extracts of Sentinel-2 images over Morbihan gulf in south Brittany (France) and compute water masks to count the many islands in that area.

Don't forget to register before we run out of tickets!

The workshop will start with an overview of Orfeo Toolbox (where to start, examples of different processing chains, etc.).
Then attendees will use a Jupyter Notebook with some cells to fill in or adapt. The purpose of the notebook will be to configure and use a small processing chain that will compute water mask by computing radiometric indices on Sentinel-2 images.

For more information on OTB, please visit https://www.orfeo-toolbox.org

Authors and Affiliations

TANGUY, Yannick (1)
(1) CNES - Centre National d'Etudes Spatiales - French Space Agency


2 - Basic. General basic knowledge is required.

Requirements for the Attendees

During this training session, we will present you Orfeo ToolBox and you will learn how to access and launch applications to build a small but realistic processing chain.

We will first introduce Orfeo ToolBox and present the purpose of the processing chain (build water masks to count islands, using a satellite image time series).
Because we cannot meet directly, we will share slides through FOSS4G tools and we will use OTB in some Jupyter Notebooks that will run on a Google Colab environment.
We will also make some demonstration of OTB on a regular Linux laptop and give you some indications to install OTB on your own environment.

If you want to go further and learn more about Orfeo ToolBox, do not hesitate to visit https://www.orfeo-toolbox.org (links to installation, to the documentation, the user forum, our gitlab)

Here is the link to the github repository that contains the notebooks :

These notebooks have to be launched from Google colaboratory : we will show you how during the training.
- These notebooks are “executable” documents, that will launch a few remote-sensing processings.
- You will have to fill in some blanks to achieve the different exercises.
- These notebooks will be executed on remote google colaboratory cloud servers (which needs a google account), so no local installation will be needed
- The first session is an “OTB guided tour” : a presentation of this tool, and an introduction to remote sensing. We will build a small processing chain to compute some watermasks and count islands…

I am a remote sensing engineer at CNES. I work on different subjects mainly related to Land Cover classification.