scholarly journals Estimation of Chlorophyll Fluorescence at Different Scales: A Review

Sensors ◽  
2019 ◽  
Vol 19 (13) ◽  
pp. 3000 ◽  
Author(s):  
Zhuoya Ni ◽  
Qifeng Lu ◽  
Hongyuan Huo ◽  
Huili Zhang

Measuring chlorophyll fluorescence is a direct and non-destructive way to monitor vegetation. In this paper, the fluorescence retrieval methods from multiple scales, ranging from near the ground to the use of space-borne sensors, are analyzed and summarized in detail. At the leaf-scale, the chlorophyll fluorescence is measured using active and passive technology. Active remote sensing technology uses a fluorimeter to measure the chlorophyll fluorescence, and passive remote sensing technology mainly depends on the sun-induced chlorophyll fluorescence filling in the Fraunhofer lines or oxygen absorptions bands. Based on these retrieval principles, many retrieval methods have been developed, including the radiance-based methods and the reflectance-based methods near the ground, as well as physically and statistically-based methods that make use of satellite data. The advantages and disadvantages of different approaches for sun-induced chlorophyll fluorescence retrieval are compared and the key issues of the current sun-induced chlorophyll fluorescence retrieval algorithms are discussed. Finally, conclusions and key problems are proposed for the future research.


2014 ◽  
Vol 620 ◽  
pp. 244-247 ◽  
Author(s):  
Xiu Li Gao ◽  
Tian Jun Hu ◽  
Ke Wang

This paper starts from the influence of vehicle exhaust, first introduces a major vehicle exhaust monitoring technology--Remote Sensing Technology, gives its monitoring principles and then analyzes the advantages and disadvantages of this method. Then,it takes the most abundant types of substances in vehicle exhaust (NOx) as example,illustrates the principles and methods for monitoring. Finally,it introduces a new vehicle exhaust monitoring method and makes a full summary.



2014 ◽  
Vol 962-965 ◽  
pp. 127-131
Author(s):  
Xin Xing Liu

Remote sensing technology as a kind of new and advanced technology has been playing an important role in geological mapping and prospecting. A single kind of remote sensing data always has both advantages and disadvantages. And with multispectral remote sensing data types increasing, the integrated application of multi-source remote sensing data will be one of the development trend of remote sensing geology. In this paper, comprehensive utilization of multi-source remote sensing data such as ETM+, ASTER, Worldview-II and DEM, lithology and geological structure of Qiangduo area in Tibet were interpreted in different levels and mineralized alteration information also was extracted. Then on the basis of modern metallogenic theory, analyzed the multiple mineralization favorite information, established the remote sensing prediction model, and on the GIS platform, carried out metallogenic prediction of the study area. The field validation shows that the results of the prediction are relatively accurate and remote sensing technology can improve the efficiency of geological work.



2013 ◽  
Vol 726-731 ◽  
pp. 4705-4708 ◽  
Author(s):  
Wei Luo ◽  
Ling Mao ◽  
Bao Li Liu ◽  
Zhi Wu Yan

Geological landscape is a kind of important tourism resources whose survey is the forerunner of tourism resource planning and development. The application of remote sensing technology develops a revolution of investigation method of geological landscape tourism resources. By analyzing domestic and international investigations and researches of remote sensing of geological landscape tourism resources, this paper considers that remote sensing technology is mainly applied to the investigation of regional geological environment background. The macro characteristics of regional geological landscape tourism resources such as resources area, type identification, dynamic change, space layout, formation lithology, topography distribution are hot research issues, and the analysis and measurement of micro characteristic values of regional geological landscape tourism resources is an important direction of future research.



2019 ◽  
Vol 19 ◽  
pp. e00683 ◽  
Author(s):  
Sarah B. Schroeder ◽  
Colleen Dupont ◽  
Leanna Boyer ◽  
Francis Juanes ◽  
Maycira Costa


1997 ◽  
Author(s):  
Tom Wilson ◽  
Rebecca Baugh ◽  
Ron Contillo ◽  
Tom Wilson ◽  
Rebecca Baugh ◽  
...  


1995 ◽  
Vol 32 (2) ◽  
pp. 77-83
Author(s):  
Y. Yüksel ◽  
D. Maktav ◽  
S. Kapdasli

Submarine pipelines must be designed to resist wave and current induced hydrodynamic forces especially in and near the surf zone. They are buried as protection against forces in the surf zone, however this procedure is not always feasible particularly on a movable sea bed. For this reason the characteristics of the sediment transport on the construction site of beaches should be investigated. In this investigation, the application of the remote sensing method is introduced in order to determine and observe the coastal morphology, so that submarine pipelines may be protected against undesirable seabed movement.





2013 ◽  
Vol 415 ◽  
pp. 305-308
Author(s):  
Kun Zhang ◽  
Hai Feng Wang ◽  
Zhuang Li

With remote sensing technology and computer technology, remote sensing classification technology has been rapid progress. In the traditional classification of remote sensing technology, based on the combination of today's technology in the field of remote sensing image classification, some new developments and applications for land cover classification techniques to make more comprehensive elaboration. Using the minimum distance classifier extracts of the study area land use types. Ultimately extracted land use study area distribution image and make its analysis and evaluation.



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