calibration
calibration


Author Comment Last activity Moderation
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