The role of light in the plants world

Gilewski, Marian

doi:10.4302/plp.v11i4.965

Cited by 6 publications

(7 citation statements)

References 10 publications

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“…As the density of chlorophyll decreased, the reflectance of these bands increased proportionally. Essentially, changes in the amount of chlorophyll result in changes in the amount of absorption of coastal blue, as well as other bands in the visible spectrum [47].…”

Section: Discussionmentioning

confidence: 99%

Investigating the Correlation between Multisource Remote Sensing Data for Predicting Potential Spread of Ips typographus L. Spots in Healthy Trees

et al. 2021

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In the last decade, thousands of hectares of forests have been lost in the Czech Republic, primarily related to European spruce bark beetle (Ips typographus L.), while more than 50% of the remaining Czech forests are in great danger, thus posing severe threats to the resilience, stability, and functionality of those forests. The role of remote sensing in monitoring dynamic structural changes caused by pests is essential to understand and sustainably manage these forests. This study hypothesized a possible correlation between tree health status and multisource time series remote sensing data using different processed layers to predict the potential spread of attack by European spruce bark beetle in healthy trees. For this purpose, we used WorldView-2, Pléiades 1B, and SPOT-6 images for the period of April to September from 2018 to 2020; unmanned aerial vehicle (UAV) imagery data were also collected for use as a reference data source. Our results revealed that spectral resolution is crucial for the early detection of infestation. We observed a significant difference in the reflectance of different health statuses, which can lead to the early detection of infestation as much as two years in advance. More specifically, several bands from two different satellites in 2018 perfectly predicted the health status classes from 2020. This method could be used to evaluate health status classes in the early stage of infestation over large forested areas, which would provide a better understanding of the current situation and information for decision making and planning for the future.

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Section: Discussionmentioning

confidence: 99%

Investigating the Correlation between Multisource Remote Sensing Data for Predicting Potential Spread of Ips typographus L. Spots in Healthy Trees

et al. 2021

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“…These currents are determined by the power matrix and cooling module, in such a way as to obtain the spectral characteristics of the source. This characteristic should be similar to the absorption curves of plants [ 24 ], which have been developed through basic research [ 25 , 26 , 27 ]. All current settings of this module can be adjusted automatically with the FPGA module [ 28 ] or manually.…”

Section: Methodsmentioning

confidence: 90%

Micro-Electro-Mechanical Systems in Light Stabilization

Gilewski

2023

Sensors

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This article discusses application considerations in the micro-electro-mechanical system’s optical sensor. Furthermore, the provided analysis is limited to application issues occurring in research or industrial applications. In particular, a case was discussed where the sensor was used as a feedback signal source. Its output signal is used to stabilize the flux of an LED lamp. Thus, the function of the sensor was the periodic measurement of the spectral flux distribution. The application problem of such a sensor is the output analogue signal conditioning. This is necessary to perform analogue-to-digital conversion and further digital processing. In the discussed case, design limitations come from the specifics of the output signal. This signal is a sequence of rectangular pulses, which can have different frequencies, and their amplitude varies over a wide range. The fact such a signal must be conditioned additionally discourages some optical researchers from using such sensors. The developed driver allows measurement using an optical light sensor in the band from 340 nm to 780 nm with a resolution of about 12 nm; in the range of flux values from about 10 nW to 1 μW, and frequencies up to several kHz. The proposed sensor driver was developed and tested. Measurement results are presented in the paper’s final part.

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“…The illuminance mainly depends on the sun movement during the day and the permeability and thickness of the cloud layer. [1][2][3][4][5][6][7][8][9][10][11][12] This article analyzes the possibility of measuring the sky luminance distribution using the SkyWatcher Virtuoso automated system, which was originally used for astronomical observations. However, it has the ability to mount other measuring devices and can be manually controlled or programmed according to the assumed algorithm.…”

Section: Introductionmentioning

confidence: 99%