Smartphone‐based estimation of green cover depends on the camera used

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http://hdl.handle.net/10138/336730

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Heinonen, R, Mattila, T. Smartphone-based estimation of green cover depends on the camera used. Agronomy Journal. 2021; 001−5. https://doi.org/10.1002/agj2.20752

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Title: Smartphone‐based estimation of green cover depends on the camera used
Author: Heinonen, Reija; Mattila, Tuomas J.
Publisher: American Society of Agronomy
Date: 2021
Language: en
Belongs to series: Agronomy Journal. 2021; 001−5
ISSN: 0002-1962
URI: http://hdl.handle.net/10138/336730
Abstract: Smartphone-based visual assessment of vegetation cover is a promising, fast, and repeatable approach that allows land managers to compare measurements on their farm with other farms. This study determined the influence of the smartphone device on green cover measurements on several crops. The hypothesis was that different smartphones would provide similar green cover (reflectance) for management purposes (i.e., <10% difference). Forty fields in Finland were sampled between 10 and 28 July 2020 with Motorola Moto G7 and Samsung Galaxy A6 smartphones. The results were compared also with Sentinel-2 remote sensing of normalized difference vegetation index (NDVI) and biomass quadrants. The two smartphones had different green reflectance values that were correlated to each other. Both green reflectance measurements correlated with the NDVI that was measured with the Sentinel 2 satellite sensor and biomass. These findings suggest that smartphone-based monitoring can be used at least to classify vegetation to low, medium, and high density but that results from different cameras should not be compared.
Description: Core Ideas • Smartphones allow a rapid and repeatable measurement of vegetation cover. • The interpretation of results depends on weather conditions, the camera, and canopy height. • Measurements can classify vegetation density but cannot be compared across devices.
Subject: agronomy
smartphones
vegetation
remote sensing
plants
smart technology
comparison
green cover
smartphone-based
estimation
cameras
Finland
Subject (ysa): maatalous
älypuhelimet
kasvillisuus
vertailu
kaukokartoitus
viljelykasvit
kasvipeite
älyteknologia
geotieteet
maataloustiede
ympäristötekniikka
kamerat
Suomi
Rights: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. http://creativecommons.org/licenses/by/4.0/


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