Revisions for Near-Infrared Camera
| 104 | warren |
August 01, 2011 16:21
| over 13 years ago
Infrared cameras for vegetation analysisInfrared photography can help assess a plant’s health, and has been used on satellites and planes for agricultural and ecological assessment, mainly by vineyards, large farms and large-scale (read: expensive) research projects. By creating a low-cost camera and working with farmers and environmental activists, we hope to explore grassroots uses for this kind of technology. What could farmers or activists do with this kind of data if the equipment costs as little as $100? Plants and infraredWe've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Make an infrared camera:NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. |
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| 103 | warren |
June 24, 2011 02:46
| over 13 years ago
Infrared cameras for vegetation analysisWe've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Make an infrared camera:NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. |
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| 102 | warren |
April 26, 2011 22:48
| over 13 years ago
Infrared cameras for vegetation analysisWe've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. |
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| 101 | warren |
April 26, 2011 22:37
| over 13 years ago
Infrared cameras for vegetation analysisWe've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. |
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| 100 | warren |
April 02, 2011 12:43
| over 13 years ago
Infrared cameras for vegetation analysis[toc hidden:1]
[toc] Infrared cameras for vegetation analysisWe've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. |
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| 99 | warren |
March 31, 2011 20:52
| over 13 years ago
[toc] Infrared cameras for vegetation analysisWe've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. |
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| 98 | warren |
March 31, 2011 20:50
| over 13 years ago
[toc] Infrared cameras for vegetation analysisWe've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. |
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| 97 | warren |
March 31, 2011 20:50
| over 13 years ago
##Infrared cameras for vegetation analysis## [toc hidden:1] [toc]
Infrared cameras for vegetation analysisWe've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. |
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| 96 | warren |
March 31, 2011 20:46
| over 13 years ago
[toc] Infrared cameras for vegetation analysisWe've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
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| 95 | warren |
March 31, 2011 20:37
| over 13 years ago
[toc] We've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
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| 94 | warren |
March 31, 2011 20:31
| over 13 years ago
[toc] We've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
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| 93 | warren |
March 31, 2011 20:28
| over 13 years ago
[[TOC]] We've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
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| 92 | warren |
March 31, 2011 20:27
| over 13 years ago
[toc] We've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
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| 91 | ncraig |
February 05, 2011 15:01
| almost 14 years ago
We've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
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| 90 | warren |
February 04, 2011 17:40
| almost 14 years ago
We've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
See, plants use visible light (mainly blue and red light) as 'food' -- not so much green light, which is why they reflect green away, and look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into useable food, and so they just bounce away to stay cool. The above image shows what colors of light plants absorb vs. reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use the in-development stereo camera being developed by the New York City chapter
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| 89 | warren |
February 04, 2011 17:16
| almost 14 years ago
We've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!).
Taking photos with IR information can be used to generate NDVI (which stands Normalized Difference Vegetation Index) and for NRG images. NDVI and NRG are methods taking the information in pictures and quantifying the amounts of infrared and other wavelengths of light reflected from vegetation. This can be used to evaluate health of vegetation by comparing ratios of blue and red light absorbed versus green and IR light reflected. It's a snapshot of how much photosynthesis is happening. This is helpful in assessing vegetative health or stress. (Read more here: https://www.agronomy.org/publications/jeq/articles/36/3/832) Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use the in-development stereo camera being developed by the New York City chapter
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| 88 | warren |
January 31, 2011 22:34
| almost 14 years ago
We've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us reflect wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!). Taking photos with IR information can be used to generate NDVI (which stands Normalized Difference Vegetation Index) and for NRG images. NDVI and NRG are methods taking the information in pictures and quantifying the amounts of infrared and other wavelengths of light reflected from vegetation. This can be used to evaluate health of vegetation by comparing ratios of blue and red light absorbed versus green and IR light reflected. It's a snapshot of how much photosynthesis is happening. This is helpful in assessing vegetative health or stress. (Read more here: https://www.agronomy.org/publications/jeq/articles/36/3/832) Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use the in-development stereo camera being developed by the New York City chapter
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| 87 | sara |
January 31, 2011 21:57
| almost 14 years ago
We've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us emit wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!). Taking photos with IR information can be used to generate NDVI (which stands Normalized Difference Vegetation Index) and for NRG images. NDVI and NRG are methods taking the information in pictures and quantifying the amounts of infrared and other wavelengths of light reflected from vegetation. This can be used to evaluate health of vegetation by comparing ratios of blue and red light absorbed versus green and IR light reflected. It's a snapshot of how much photosynthesis is happening. This is helpful in assessing vegetative health or stress. (Read more here: https://www.agronomy.org/publications/jeq/articles/36/3/832) Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use the in-development stereo camera being developed by the New York City chapter
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| 86 | sara |
January 31, 2011 21:37
| almost 14 years ago
We've been modifying cheap cameras to take infrared (IR) photos. Though we cannot perceive it with our eyes the plants and other materials around us emit wavelengths of light in infrared. Interestingly the sensors in digital camera can react to wavelengths of light in the near infrared. Presently IR light is filtered out from our cameras so that digital images look normal to us. Removing that filter allows us to pickup information in IR using a digital camera (Caution is required to remove this filter! Please study up before trying any of this!). Taking photos with IR information can be used to generate NDVI (which stands Normalized Difference Vegetation Index) and for NRG images. NDVI and NRG are methods taking the information in pictures and quantifying the amounts of infrared and other wavelengths of light emitted from vegetation. This can be used to tell you about the health of vegetation as evaluating how much blue and red light are they absorbing versus how much green and IR light are emitting tell you how much they are photosynthesizing. This is helpful in assessing vegetative health or stress. (Read more here: https://www.agronomy.org/publications/jeq/articles/36/3/832) Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use the in-development stereo camera being developed by the New York City chapter
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| 85 | warren |
January 28, 2011 17:05
| almost 14 years ago
We've been modifying cheap cameras to take infrared photos. This can be used to generate NDVI or NRG images, which is helpful in assessing vegetative health or stress. (Read more here: https://www.agronomy.org/publications/jeq/articles/36/3/832) Learn about NDVI images and how they work Learn to remove the infrared filter from your camera: https://www.flickr.com/photos/lpimaging/sets/72157625698391563/with/5355456142/ NDVI example:
NRG example:
How to capture infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use the in-development stereo camera being developed by the New York City chapter
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