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Laser induced fluorescence

Remote sensing of vegetation by monitoring laser-induced
chlorophyll fluorescence. Development and testing of
european airborne multi-spectral chlorophyll fluorescence
lidar for vegetal monitoring.

Aiding Forestry and Agriculture As air pollution, the use of chemicals, and natural hazards take their toll on Europe's forests and farmland, research from GERMANY, FRANCE, ITALY and SWEDEN cooperate under the umbrella of EUREKA to develop a way of fast monitoring the health status of crop and forest stands. The goal of the LASFLEUR project is to develop a remote sensing system based on an airborne laser to collect information on the state of plant health across large areas of vegetation. By using laser-induced fluorescence signals of vegetation, conclusions may be drawn on the state of plant vitality. Thus, such measurements may be valuable tools for the development of a monitoring system for environmental damage forecast recovery assessment. In essence, the system measures photosynthesis - the process by which plants convert sunlight into chemical energy. Diseased plant leaves partially lose their ability to use the absorbed radiation. The amount of radiation not used to sustain plant life, is emitted as fluorescence and will increase with damage. Thus, from chlorophyll fluorescence data, information on the state of photosynthesis performance may be derived. Whereas the German and Italian project partners are mainly concerned with measuring and interpreting the fluorescence spectrum (Spectral Radio Principle) with regard to its dependency on the physiological and systems-relevant parameters, the project partner in FRANCE will mainly study the correlation of time-resolved fluorescence with physiological parameters (Time Resolved Principles). The Swedish group is developing an imaging fluorescence LIDAR. It is planned in the European work distribution within the EUREKA project LASFLEUR to develop, realise, optimize, test and evaluate all systems in order to provide a suggestion for a future European airborne LIDAR system which would be able to measure the chlorophyll fluorescence of vegetation spectrally as well as time-resolved. Parallel to these studies on laser-induced chlorophyll-a fluorescence passive spectro-radiometer data suitable for fieldwork will be taken as reference. For comparability the scientists have already agreed on 4 tree and crop species which will be studied under different environmental conditions. To this will be added some species of regional importance. Research in ITALY and Southern FRANCE will concentrate on effects of the Mediterranean climate such as lack of water, heat, etc. while the northern countries will lay more emphasis on the problem of agricultural and industrial pollution. There is broad interest in this new technology in forestry production and agriculture worldwide. Large areas can be surveyed, enabling data to be collected on a regular basis. Frequent monitoring may help to plan harvest, irrigation and fertilisation management. The project organisers are confident that the system will also provide a sound basis for political decisions to introduce tighter pollution controls.
Acronym: 
LASFLEUR
Project ID: 
380
Start date: 
01-11-1989
Project Duration: 
61months
Project costs: 
12 420 000.00€
Technological Area: 
Market Area: 

Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.