University of Tasmania
Browse
- No file added yet -

Retrieval of hyperspectral information from multispectral data for perennial ryegrass biomass estimation

Download (1.46 MB)
journal contribution
posted on 2023-05-21, 04:31 authored by Togeiro de Alckmin, G, Kooistra, L, Richard RawnsleyRichard Rawnsley, de Bruin, S, Arko LucieerArko Lucieer
The use of spectral data is seen as a fast and non-destructive method capable of monitoring pasture biomass. Although there is great potential in this technique, both end users and sensor manufacturers are uncertain about the necessary sensor specifications and achievable accuracies in an operational scenario. This study presents a straightforward parametric method able to accurately retrieve the hyperspectral signature of perennial ryegrass (Lolium perenne) canopies from multispectral data collected within a two-year period in Australia and the Netherlands. The retrieved hyperspectral data were employed to generate optimal indices and continuum-removed spectral features available in the scientific literature. For performance comparison, both these simulated features and a set of currently employed vegetation indices, derived from the original band values, were used as inputs in a random forest algorithm and accuracies of both methods were compared. Our results have shown that both sets of features present similar accuracies (root mean square error (RMSE) ≈490 and 620 kg DM/ha) when assessed in cross-validation and spatial cross-validation, respectively. These results suggest that for pasture biomass retrieval solely from top-of-canopy reflectance (ranging from 550 to 790 nm), better performing methods do not rely on the use of hyperspectral or, yet, in a larger number of bands than those already available in current sensors.

History

Publication title

Sensors

Volume

20

Issue

24

Article number

7192

Number

7192

Pagination

1-20

ISSN

1424-8220

Department/School

School of Geography, Planning and Spatial Sciences

Publisher

MDPI AG

Place of publication

Matthaeusstrasse 11, Basel, Switzerland, Ch-4057

Rights statement

Copyright: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons 4.0 International (CC BY 4.0) license (https://creativecommons.org/licenses/by/4.0/).

Repository Status

  • Open

Socio-economic Objectives

Sown pastures (excl. lucerne)

Usage metrics

    University Of Tasmania

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC