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Yield Estimates by a Two-Step Approach Using Hyperspectral Methods in Grasslands at High Latitudes

Norwegian Institute for Bioeconomy Research, P.O. Box 115, N-1431 Ås, Norway
Norut Northern Research Institute, P.O. Box 6434, NO-9294 Tromsø, Norway
Norwegian Institute for Nature Research (NINA), FRAM-High North Research Centre for Climate and the Environment, P.O. Box 6606 Langnes, NO-9296 Tromsø, Norway
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(4), 400;
Received: 7 January 2019 / Revised: 11 February 2019 / Accepted: 11 February 2019 / Published: 16 February 2019
(This article belongs to the Section Remote Sensing in Agriculture and Vegetation)
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Ruminant fodder production in agricultural lands in latitudes above the Arctic Circle is constrained by short and hectic growing seasons with a 24-hour photoperiod and low growth temperatures. The use of remote sensing to measure crop production at high latitudes is hindered by intrinsic challenges, such as a low sun elevation angle and a coastal climate with high humidity, which influences the spectral signatures of the sampled vegetation. We used a portable spectrometer (ASD FieldSpec 3) to assess spectra of grass crops and found that when applying multivariate models to the hyperspectral datasets, results show significant predictability of yields (R2 > 0.55, root mean squared error (RMSE) < 180), even when captured under sub-optimal conditions. These results are consistent both in the full spectral range of the spectrometer (350–2500 nm) and in the 350–900 nm spectral range, which is a region more robust against air moisture. Sentinel-2A simulations resulted in moderately robust models that could be used in qualitative assessments of field productivity. In addition, simulation of the upcoming hyperspectral EnMap satellite bands showed its potential applicability to measure yields in northern latitudes both in the full spectral range of the satellite (420–2450 nm) with similar performance as the Sentinel-2A satellite and in the 420–900 nm range with a comparable reliability to the portable spectrometer. The combination of EnMap and Sentinel-2A to detect fields with low productivity and portable spectrometers to identify the fields or specific regions of fields with the lowest production can help optimize the management of fodder production in high latitudes. View Full-Text
Keywords: remote sensing; partial least squares (PLS); yield; crop; grass; EnMap; Arctic agriculture remote sensing; partial least squares (PLS); yield; crop; grass; EnMap; Arctic agriculture

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Ancin-Murguzur, F.J.; Taff, G.; Davids, C.; Tømmervik, H.; Mølmann, J.; Jørgensen, M. Yield Estimates by a Two-Step Approach Using Hyperspectral Methods in Grasslands at High Latitudes. Remote Sens. 2019, 11, 400.

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