MESMA Documentation



MESMA is both a QGIS plugin and stand-alone python package that implements the MESMA (Multiple Endmember Spectral Mixture Analysis) unmixing algorithm in the field of Remote Sensing.

It is based on VIPER Tools: a software package written for ENVI/IDL and released in 2007. Several updates have been released since and now it has been ported to PyQGIS in the period 2017 - 2020. The original VIPER Tools is now split over two python/QGIS tools: Spectral Library Tool and MESMA.

Spectral Library Tool provides the following:
MESMA provides the following:

The software has now been developed in the open source environment to encourage further development of the tool.


When using the MESMA tool, please use the following citation:

Crabbé, A. H., Somers, B., Roberts, D. A., Halligan, K., Dennison, P., Dudley, K. (2020). MESMA QGIS Plugin (Version x) [Software]. Available from


The software and user guide are based on VIPER Tools 2.0 (UC Santa Barbara, VIPER Lab): Roberts, D. A., Halligan, K., Dennison, P., Dudley, K., Somers, B., Crabbe, A., 2018, Viper Tools User Manual, Version 2, 91 pp.

MESMA is also using two python packages developed by Benjamin Jakimow and Andreas Rabe:

This revision is funded primarily through BELSPO (the Belgian Science Policy Office) in the framework of the STEREO III Programme – Project LUMOS - SR/01/321.

Logo’s were created for free at


This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License (COPYING.txt). If not see

_images/lumos_big.svg _images/viper_big.svg _images/mesma.PNG