Do you think it would be possible to see shifts in photosynthetic activity in plants due to low/high nutrients/humidity? Especially when IR-filter removed?
Yes. My father does research in this area. Specifically, inferring the health of vegetation (among other attributes of land cover) from statistical analysis of satellite imagery.
From what I recall, you can measure the level of photosynthetic activity in an area given the reflectivity of the land (and, I would think, some basic model of what type of vegetation is present in the area)
One example from his research: the fall of the Soviet Union had a statistically significant impact on weather patterns in Kazakhstan (the breadbasket of the USSR) because the land usage changed so much with agricultural policies before and after the fall.
To measure the pulse of a person, you need to consider an interval of a few seconds, so it's safe to assume that the only thing that the position and strength of the light are almost constant. The time that takes the plants to reduce the amount of nutrients or water is much bigger, so I think that it would be much more difficult to compensate the changes in the ambient light.
pbh101|13 years ago
From what I recall, you can measure the level of photosynthetic activity in an area given the reflectivity of the land (and, I would think, some basic model of what type of vegetation is present in the area)
One example from his research: the fall of the Soviet Union had a statistically significant impact on weather patterns in Kazakhstan (the breadbasket of the USSR) because the land usage changed so much with agricultural policies before and after the fall.
Quick link to the research overview page: http://globalmonitoring.sdstate.edu/research.php
gus_massa|13 years ago