- Free software: Apache-2.0
- Documentation: https://geomultisens.git-pages.gfz-potsdam.de/spechomo/doc/
- The paper corresponding to this software repository can be found here: Scheffler et al. 2020 (cite as: Scheffler D., Frantz D., Segl K. (2020). Spectral harmonization and red edge prediction of Landsat-8 to Sentinel-2 using land cover optimized multivariate regressors. Remote Sens. Environ. 241, 111723. https://doi.org/10.1016/j.rse.2020.111723)
- Information on how to cite the SpecHomo Python package can be found in the CITATION file.
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SpecHomo is a Python package for spectral homogenization of multispectral satellite data, i.e., for the transformation of the spectral information of one sensor into the spectral domain of another one. This simplifies workflows, increases the reliability of subsequently derived multi-sensor products and may also enable the generation of new products that are not possible with the initial spectral definition.
SpecHomo offers different machine learning techniques for the prediction of the target sensor spectral information. So far, multivariate linear regression, multivariate quadratic regression and random forest regression are implemented. To allow easy comparisons to the most simple homogenization approach, we also implemented linear spectral interpolation.
In contrast to previous spectral homogenization techniques, SpecHomo not only allows to apply a global (band-wise) transformation with the same prediction coefficients for all gray values of a spectral band. It also distinguishes between individual spectral characteristics of different land-cover types by using specifically trained prediction coefficients for various spectral clusters. This increases the accuracy of the predicted spectral information. Apart from that, SpecHomo can not only be used to homogenize already similar spectral definitions - it also allows to predict unilaterally missing bands such as the red edge bands that are not present in Landsat-8 data.
Prediction accuracies and effects to subsequent products such as spectral indices or classifications have been evaluated in the above mentioned paper at the example of Sentinel-2 spectral information predicted from Landsat-8. Algorithm details may also be found there.
Satellite data (surface reflectance) acquired by following sensors may be used as source or target sensor:
- Landsat-5 TM
- Landsat-7 ETM+
- Landsat-8 OLI
- Sentinel-2A MSI
- Sentinel-2B MSI
- RapidEye-5 MSI
- SPOT-4
- SPOT-5
SpecHomo features classifiers for homogenization that we trained in the context of the GeoMultiSens project (see the credits section) and for our evaluations related with the above mentioned paper. The initial spectral information for classifier training has been derived from hyperspectral airborne data, spectrally convolved to different sensors. You may also train your own homogenization classifiers specifically optimized to your area of interest. SpecHomo provides the needed functionality for that.
For further details on how to use SpecHomo check out the documentation!
The spechomo package was developed within the context of the GeoMultiSens project funded by the German Federal Ministry of Education and Research (project grant code: 01 IS 14 010 A-C).
This package was created with Cookiecutter and the audreyr/cookiecutter-pypackage project template.