Log In now to add this Gigapan to a group gallery.
Log In now to add this Gigapan to a gallery.
About This GigapanToggle
- Taken by
- Chris Fastie
- Explore score
- 0.32 Gigapixels
- Date added
- Nov 16, 2013
- Date taken
- Nov 15, 2013
- environmental, experimental, landscape, nature
Ten views of a detail of the landscape scene from Pine Hill in Salisbury, VT. Three cameras were used to make these images. Two 200°+ gigapans were made with a normal camera (Canon Powershot S95: www.gigapan.com/gigapans/144702) and a Powershot A2200 with its IR block filter replaced with a piece of Wratten 25A gel filter (www.gigapan.com/gigapans/144744). Part of the scene was captured by another A2200 with its IR block filter replaced with a Schott glass BG3 blue filter. Both of these filters allow mostly near infrared (NIR) light to be captured by one of the color channels, so false color infrared (like satellite images: www.gigapan.com/gigapans/144700) or NDVI (Normalized Difference Vegetation Index: www.gigapan.com/gigapans/144709) images can be made.
The blue channel of the Wratten 25A camera is almost pure NIR light, and the red channel of the BG3 camera is mostly NIR with some visible light.
The foliage of healthy plants reflects almost all NIR light, but absorbs visible light, especially red and blue, to power photosynthesis. Few natural surfaces reflect as much NIR as green leaves. So wherever lots of NIR light is being reflected, photosynthesis is suspected. NDVI is an index of the difference between reflected NIR and visible light, and higher values indicate more photosynthetic activity.