Printed copies of the [Grassroots Mapping Forum](/subscribe) offer a means to continue monitoring the sites they depict; if you can visit the site shown on the map, annotate any observations directly onto the back side (the blue side). You can mail in the map or photograph upload it here. _This feature is coming soon -- for now, please email your submissions to [organizers@publiclaboratory.org](mailto:organizers@publiclaboratory.org)_...
| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| jiteovien | "@jeffalk PM concentrations do not have meaning if there isn't an understanding of how the concentrations affect health and well being. Perhaps I us..." | Read more » | about 6 years ago | |||
| pdhixenbaugh | "Isn't he doing not a 24 h average, but a week average in this case? That sounds like it would have merit. One thing I'm legitimately curious about..." | Read more » | about 6 years ago | |||
| shinchan | "Pretty! This was a really wonderful post. itudomino " | Read more » | about 6 years ago | |||
| jeffalk | "jiteovien: I realize you have put a considerable amount of effort into your project and are trying to do an excellent job. I believe you are exhib..." | Read more » | about 6 years ago | |||
| amirberAgain | "Here is a google Colab recreating this: https://colab.research.google.com/drive/1rADQ9hbIEP-DO1hsLpVWAOz2wJu4SuwM " | Read more » | about 6 years ago | |||
| jiteovien | "Hey @jeffalk . I am well aware that the Purple Air data sheets are logged in units µg/m3. I referenced airnow.gov that has conversion calculators f..." | Read more » | about 6 years ago | |||
| cheapmcmbelt | "MCM Medium Stark Lady Rabbit Odeon Studs Backpack In Burgundy Shop www.mcmbackpacksoutletonline.com Cheap MCM Backpacks Outlet Store and Buy MCM ..." | Read more » | about 6 years ago | |||
| jeffalk | "I believe you are not quite correct in the determination of the AQI. First, the downloaded data from purple air gives concentrations, for pm2.5 th..." | Read more » | about 6 years ago | |||
| warren | "Ah, i see you've already approached this topic, sorry to repeat! " | Read more » | about 8 years ago | |||
| iamkat | "Ah that's really helpful to know, thank you! " | Read more » | about 8 years ago | |||
| cfastie | "Thanks for the details. After you use a CFL to calibrate the spectrometer, replace the CFL with another light source. If the spectrometer is not d..." | Read more » | about 8 years ago | |||
| iamkat | "Hi Chris, what do you mean by a standard lycopene extraction? The UV spec of lycopene in ether can be found here http://link.springer.com/article/..." | Read more » | about 8 years ago | |||
| cfastie | "Kat, Do you have a standard lycopene extraction? How do know what the spectrum of lycopene should look like? Are you using a fluorescent lamp to ..." | Read more » | about 8 years ago | |||
| chongyukwai | "I think that set still has error since some of the important band is still below the dim light area eg red if they are using the same light source ..." | Read more » | over 9 years ago | |||
| warren | "I'm worried though that your images are not taken with the same calibration, so the wavelengths may not be comparable. Also, in this sample, I see ..." | Read more » | over 9 years ago | |||
| chongyukwai | "Yes, i have done the calibration manually uses the blue and green light. Because the urine(concentrated urine and non-concentrated urine) are colle..." | Read more » | over 9 years ago | |||
| warren | "Your three spectra don't seem to have the same range -- are you sure about their calibrations matching? " | Read more » | over 9 years ago | |||
| warren | "Update - I moved this tool to: https://mapknitter.org/sorter/ " | Read more » | over 10 years ago | |||
| daniedb68 | "JIm, Yes, me too. Also very new to NDVI. I post a Update on the NDVI App soon, which have more LUT comparisions aswell as some examples, and fixes...." | Read more » | over 10 years ago | |||
| headj | "Danie, thank you for the insight. I will keep learning. I find this area interesting. " | Read more » | over 10 years ago | |||
| daniedb68 | "Jim Thanks. I'm also in a Learning Curve. But according to what I understand 0.1-0.6 is very green. Plants/vegetation is between 0.2 to 0.8. I migh..." | Read more » | over 10 years ago | |||
| headj | "Sir, this is very nice tool. I used it with some raw images I took a few years back. I can understand better what I am looking at, grass, sky, tree..." | Read more » | over 10 years ago | |||
| mathew | "Glad to see you experimenting, I wish I could test your program, but It looks Windows only. have you looked at either our Infragram.org or Ned Hor..." | Read more » | over 10 years ago | |||
| warren | "Hmm, I'm worried that the ~840nm spike is just a camera artifact -- see how it's also represented in this spectrum of a halogen light through coca-..." | Read more » | almost 11 years ago |