Author | Comment | Last activity | Moderation | ||
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mathew | "I've been in touch with Airmetrics over the issue. they're been very helpful and responsive. (see below) " | Read more » | about 7 years ago | |||
mathew | "Airmetrics got to scratching their heads over this difference as well! It turns out there is an additional variable that isn't listed in the manua..." | Read more » | about 7 years ago | |||
warren | "Do we have contacts who've used these instruments that we could reach out to for input on these calculations? " | Read more » | about 7 years ago | |||
mathew | "I contacted some folks at Airmetrics, and their initial reaction was that I appeared to be doing it correctly (but they didn't really dig in). The ..." | Read more » | about 7 years ago | |||
mathew | "@gretchengehrke 1) yes, P and T are pressure and temp. There's Pstd and Pact (P standard and P actual) same for temperature. Those are the tempera..." | Read more » | about 7 years ago | |||
gretchengehrke | "Hi Mathew, There are three things that come to my mind: (1) To think more through Equation 1, I'm curious what P and T are. Pressure and Temp? (2) ..." | Read more » | about 7 years ago | |||
mathew | "That is an interesting question. I think the laser would get rid of chromatic aberration-- its a single frequency of light-- but I'm not sure that..." | Read more » | about 7 years ago | |||
marlokeno | "Hi, @mathew and @SimonPyle - Terrific work! After seeing the demonstration mathew gave at the barnraising in November '16, and then looking at Ca..." | Read more » | about 7 years ago | |||
nedhorning | "Hi Jeff - This should be the image. Let me know if this is ok or if I need to post it some other way Ned " | Read more » | about 7 years ago | |||
warren | "Hi, Ned - do you think you could post the original images from which you generated your NDVI? Thanks! " | Read more » | about 7 years ago | |||
xose | "Hi @jeffalk! Thanks for your help! That's not a basic question. That's in fact the kind of answer we've received from Shinyei, that every sensor ha..." | Read more » | over 7 years ago | |||
jeffalk | "Please excuse this basic question but what makes you think that all such devices should calibrate with the same resistance? You've shown that for s..." | Read more » | over 7 years ago | |||
JuanfraAlvarez | "I have just found this: http://takingspace.org/wp-content/uploads/ShinyeiPPD42NS_Deconstruction_TracyAllen.pdf "In the two that I tested, VR3 was ..." | Read more » | over 7 years ago | |||
JuanfraAlvarez | "thanks @warren, that post (pdf of field calibrations) is the reason we changed the sampletime to 3600000ms (1h) as this guys have tested its in ho..." | Read more » | over 7 years ago | |||
warren | "Awesome post and good questions! I did find this interesting post w some possibly helpful info: https://publiclab.org/notes/Willie/04-01-2014/fie..." | Read more » | over 7 years ago | |||
JuanfraAlvarez | "Here the PM10 (and NO2) Levels this afternoon. " | Read more » | over 7 years ago | |||
JuanfraAlvarez | "If you want to check the station we are going to be using as reference, its exactly the one circled in the image, you can check it in this link htt..." | Read more » | over 7 years ago | |||
imvec | "Found out that seedstudio folks have this image in the documentation but no value... https://raw.githubusercontent.com/SeeedDocument/Grove_Dust_Sen..." | Read more » | over 7 years ago | |||
DavidMack | "neat. maybe put the fan on the charcoal side and blow into the tube so you don't get infiltration from the flap in the middle? The other way I've..." | Read more » | over 7 years ago | |||
xose | "First approach. Now we're powering it up using a potentiometer to control the fan revolutions and begin testing. Even though the sensor in the pict..." | Read more » | over 7 years ago | |||
liz | "Thanks @zega! " | Read more » | over 7 years ago | |||
liz | "This is so neat! " | Read more » | over 7 years ago | |||
nedhorning | "Hi kaushalsingh – The three target reflectance values you note seem like a good choice to me. At this point I do not have study material in additi..." | Read more » | over 7 years ago | |||
kaushalsingh | "@nedhorning You got it right Ned. I am trying to calibrate the image using a reference target before you calculate NDVI. Suppose, I have 3 target ..." | Read more » | over 7 years ago |