The hsdar package contains classes and functions to manage, analyse and simulate hyperspectral data. These might be either spectrometer measurements or hyperspectral images through the interface of raster.
hsdar provides amongst others the following functionality.
hsdar is designed to handle even large sets of spectra. Spectra are
stored in a
Speclib containing, amongst other details, the wavelength and reflectance for each spectrum.
hsdar further contains functions for
plotting spectral data and
applying functions to spectra.
A variety of established methods for data manipulation such as filter functions (
noiseFiltering) for noise reduction,
resampling of bands to various satellite sensors (
continuum removal (
calculations of derivations (
and extraction of absorption features (
cut_specfeat) are implemented.
Supported methods to analyse vegetation spectra are the calculation of red edge parameters (
vegindex) and soil (
smgm) indices as well as ndvi-like narrow band indices (
hsdar further enables to perform linear spectral unmixing of spectra (
unmix) by use of endmember spectra. Note that some functions allow the parallel execution using the doMPI-, doMC- and foreach-packages. Execute '
hsdar_parallel()' to get supporting functions.
hsdar has implemented the models PROSAIL 5B (
PROSAIL, Jacquemoud et al. 2009) and
PROSPECT 5 and D (
PROSPECT, Jacquemoud and Baret 1990, Feret et al. 2017)
to simulate spectra of canopy and plants.
Several classes are defined and used in hsdar. Most of the classes are used and respective objects are created internally. However, the following figure gives an overview which class is used at which stage of processing.
Note that the asterisk marks all classes for which wrapper functions for the caret package exist.
To see the preferable citation of the package, type
Development initially funded by German Federal Ministry of Education and Research (03G0808C) in the scope of the project PaDeMoS as precondition to develop a space-based Pasture Degradation Monitoring System for the Tibetan Plateau.
Lukas Lehnert, Hanna Meyer, Jörg Bendix
Feret J.B., Gitelson A.A., Noble S.D., & Jacquemoud S. (2017), PROSPECT-D: towards modeling leaf optical properties through a complete lifecycle, Remote Sensing of Environment, 193, 204-215.
Jacquemoud, S., Verhoef, W., Baret, F., Bacour, C., Zarco-Tejada, P.J., Asner, G.P., Francois, C., and Ustin, S.L. (2009): PROSPECT + SAIL models: a review of use for vegetation characterization, Remote Sensing of Environment, 113, S56-S66.
Jacquemoud, S. and Baret, F. (1990). PROSPECT: A model of leaf optical properties spectra, Remote Sensing of Environment 34: 75 - 91.
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