| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| liz | "Hi! @LaPa (hoping to trigger a notification email to them) :) " | Read more » | over 7 years ago | |||
| elongo | "Hi @LaPa, 1) just wondering which steps you followed to setup and run ImageJ and Fiji in your Raspberry Pi, and get the NDVI images. I am followin..." | Read more » | over 7 years ago | |||
| Sidney_AstroPlant | "Using NIR LEDs seems like a good option to look into and I'm happy to hear that I might not have to deal with extensive filtering! I just got a res..." | Read more » | over 7 years ago | |||
| cfastie | "A simple option might be to turn on some NIR LEDs when the photography happens. The NIR:VIS ratio might not match sunlight, but if you know what it..." | Read more » | over 7 years ago | |||
| Sidney_AstroPlant | "The kit is fully enclosed with LED with a certain blue and red ratio (I have to verify what the exact ratio is). This brings me to the conclusion t..." | Read more » | over 7 years ago | |||
| cfastie | "Thanks for adding a photo. NDVI is based on the assumption that the light illuminating the foliage has a certain proportion of NIR and VIS -- the p..." | Read more » | over 7 years ago | |||
| cfastie | "Using two cameras solves one of the two problems I described (mixed NIR and VIS). That problem can also be solved by measuring or making assumption..." | Read more » | over 7 years ago | |||
| Sidney_AstroPlant | "Thanks Chris for your response. My assumption was that the blue filter supplied with the RPI Noir camera blocks the red channel fully. So you get a..." | Read more » | over 7 years ago | |||
| Sidney_AstroPlant | "Thanks for the positive messages! I see that both of you are active in open source hardware and software initiatives. We are thinking to share our ..." | Read more » | over 7 years ago | |||
| zengirl2 | "Glad you posted here as you know I'm a fan of the project. :) " | Read more » | over 7 years ago | |||
| cfastie | "I haven't used the Pi NoIR cam and have not seen your photos, so I can only respond from general principles. Camera sensors are not as sensitive ..." | Read more » | over 7 years ago | |||
| warren | "Just wanted to say this looks really cool! " | Read more » | over 7 years ago | |||
| aldrin | "sir, do you now the right values of white balance in pi noir in capturing ndvi? " | Read more » | over 7 years ago | |||
| jfd | "nice work! " | Read more » | almost 8 years ago | |||
| thechapu | "@carolccarvalho mi nombre es Cristofer, soy de Chile. Llevo 2 años usando raspberry y mas de 1 año aprendiendo sobre NDVI, en la Universidad tuve u..." | Read more » | about 8 years ago | |||
| cfastie | "Most surfaces reflect both NIR and visible light. Ideally you would have some targets that reflect various amounts of both and you would know the p..." | Read more » | over 8 years ago | |||
| carolccarvalho | "Hi Chris, thanks again! Which are the surfaces that reflect both blue and NIR light? Could you give me some examples? And about mobius camera, i ..." | Read more » | over 8 years ago | |||
| cfastie | "1) When you said shortcut, you meant I could for example use a blue led or a blue paint as target? Or do you have another suggestion? An LED or ot..." | Read more » | over 8 years ago | |||
| carolccarvalho | "Hi Chris, thank you very much for the help! I'll choose better times and avoid shadows the next flight. And I'll try correcting the exposure too! ..." | Read more » | over 8 years ago | |||
| cfastie | "Those NDVI images look reasonable. Deep shadows are not being handled very well so they are assigned NDVI values of 1.0 (magenta) or apparently -1...." | Read more » | over 8 years ago | |||
| LaPa | "I removed, at the moment, the camera from the greenhouse. I took thousands of IR photos (every 10 minutes for more then a month) I got a movie ( h..." | Read more » | over 8 years ago | |||
| cfastie | "A DIY spectrometer can be used to characterize the spectral reflectivity of a target if two things are true: The spectrometer must be sensitive i..." | Read more » | over 8 years ago | |||
| LaPa | "Thank all of you for the suggestions Maybe it is the wrong strumentation but i don't know: 1) If I buy your http://store.publiclab.org/products/de..." | Read more » | over 8 years ago | |||
| nedhorning | "Hi LaPa - You can contact me at horning@amnh.org and I will send you the spectra. You can also look at this research note for links to sites with ..." | Read more » | over 8 years ago |