Add more details to the installation description

docs/source/installation.rst

@@ -5,27 +5,36 @@ Installation
 Installing sen2chain
 --------------------
 
-This package requires pip3, Python 3, GDAL, OTB and `Sen2Cor <http://step.esa.int/main/third-party-plugins-2/sen2cor/>`_.
+This package requires Python 3, GDAL, OTB and `Sen2Cor <http://step.esa.int/main/third-party-plugins-2/sen2cor/>`_.
 
-.. note:: The current version of sen2chain is not available on Windows.
+.. note:: The current version of sen2chain is not available on Windows (yet).
 
 
 Prerequisites
 ^^^^^^^^^^^^^
-pip3, GDAL and OTB
+GDAL
 
 .. code-block:: console
 
-    sudo apt install gdal-bin libgdal-dev python3-gdal otb-bin python3-otb python3-pip
+    sudo apt install gdal-bin libgdal-dev
     
-As indicated in the `OTB installation <https://www.orfeo-toolbox.org/CookBook/Installation.html#linux-x86-64>`_, do not forget to initialize the environment when you launch a new terminal with
+Orfeo Toolbox (OTB) and its python bindings
+    
+.. code-block:: console
+
+    sudo apt install otb-bin
+    # required by the python bindings
+    sudo apt install python3-numpy
+
+
+    
+As indicated in the `OTB installation <https://www.orfeo-toolbox.org/CookBook/Installation.html#linux-x86-64>`_, do not forget to initialize the environment when you launch a new terminal:
 
 .. code-block:: console
 
     source otbenv.profile
 
 
-
 Sen2Cor
 
 .. code-block:: console
@@ -36,6 +45,14 @@ Sen2Cor
 Install sen2chain from sources
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+Python pip
+
+.. code-block:: console
+
+    sudo apt install python3-pip
+    
+Download Sen2Chain and install the python dependencies:
+
 .. code-block:: console
 
     git clone https://framagit.org/jebins/sen2chain.git
@@ -47,7 +64,7 @@ Configuration
 -------------
 
 The configuration file is located at: ``~/sen2chain_data/config/config.cfg``.
-This file (and corresponding path) is only created after the first sen2chain import in python.
+This file (and corresponding path) is only created after the first Sen2Chain import in python.
 
 Configure Sentinel-2 images library
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -57,7 +74,7 @@ At first launch default folders are created in ``~/sen2chain_data/data``. You ca
 Sen2cor configuration
 ^^^^^^^^^^^^^^^^^^^^^
 
-The full path to the sen2cor bashrc file is needed to process L1C to L2A.
+The full path to the sen2cor bashrc file is needed to process L1C to L2A. 
 e.g.: ``/home/user/Sen2Cor-02.05.05-Linux64/L2A_Bashrc``
 
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