# General Information

This plugin generates derived SAR parameters (viz. vegetation indices, polarimetric decomposition parameters) from input polarimetric matrix (C3, T3, C2, T2). The input data needs to be in [PolSARpro](https://earth.esa.int/web/polsarpro/home)/[ENVI](https://www.l3harrisgeospatial.com/Software-Technology/ENVI) format (*.bin and *.hdr). It requires [numpy](https://numpy.org/), [matplotlib](https://matplotlib.org/) python libraries pre-installed.

## Installation

> __Note:__ SAR tools requires QGIS version >=3.0.

- The easiest way (requires internet connection) :

    - Open QGIS -> Plugins -> Manage and Install Plugins… -> select ``All`` tab -> search for ``SAR tools`` –> select and install plugin

- Alternative way (offline installation) :

    - Go to [releases](https://github.com/Narayana-Rao/SAR-tools/releases) of this repository -> select desired version -> download the ``.zip`` file.

    - Open QGIS -> Plugins -> Manage and Install Plugins… -> ``install from ZIP`` tab –> select the downloaded zip –> install plugin (ignore warnings, if any).

## Available functionalities:

> - Indices :

>     - Radar Vegetation Index (RVI) (Full-pol and dual-pol)

>     - Generalized volume Radar Vegetation Index (GRVI)

>     - Polarimetric Radar Vegetation Index (PRVI) (Full-pol and dual-pol)

>     - Dual-pol Radar Vegetation Index (DpRVI)

>     - Degree of Polarization (DOP) (Full-pol, dual-pol, and compact-pol)

>     - Compact-pol Radar Vegetation Index (CpRVI)

> - Polarimetric Decompositions :

>     - Model free 3-Component decomposition for full-pol data (MF3CF).

>     - Model free 3-Component decomposition for compact-pol data (MF3CC)

>     - Improved S-Omega decomposition for compact-pol data (iS-Omega)