| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| cfastie | "Good point. Here is a version with 4 shells and no support. RTegelbeckersDSK4s.x3g " | Read more » | about 10 years ago | |||
| cfastie | "It might be good to also note which if any of these programs will make orthophotos -- just autostitch air photos into map images without topographi..." | Read more » | about 10 years ago | |||
| cfastie | "Matt, I always use swivels because they are so convenient for hooking and unhooking the gear. Another advantage may be that they actually swivel a..." | Read more » | about 10 years ago | |||
| cfastie | "This is a nice design, well thought out. Here is an x3g file for printing it on a MakerBot Replicator 1 with these settings: PLA, right extruder,..." | Read more » | about 10 years ago | |||
| cfastie | "David, Did you see this note about the potential to indicate the presence of cyanobacteria using the difference between NDVI made with infrablue an..." | Read more » | about 10 years ago | |||
| cfastie | "Here is a list of the things you want to say: - The list MUST start after a blank line (like the preceding one) + Each line starts with a dash or ..." | Read more » | about 10 years ago | |||
| cfastie | "Great progress Pat. The Wratten 25 photos are really sharp. They should allow very good NDVI images. Also, nice car. The blemish looks a lot like..." | Read more » | about 10 years ago | |||
| cfastie | "It's good to know about the NDRE. Instead of computing the difference between reflected NIR and reflected red light, I think NDRE replaces reflecte..." | Read more » | about 10 years ago | |||
| cfastie | "Thanks Grayson, I was referring to stretching the histograms in the Fiji plugin. I forget what the default is, but it can make a big difference. ..." | Read more » | about 10 years ago | |||
| cfastie | "Rita, If you are using two cameras, one unmodified and one to capture an NIR image, the best filter to use in the NIR camera is one that blocks all..." | Read more » | about 10 years ago | |||
| cfastie | "It's going to be 40° F on Thursday, Friday, and Saturday, so if you want to collect environmental data inside the SNOWFEST igloo, the RIFFLE might ..." | Read more » | about 10 years ago | |||
| cfastie | "Grayson, The NDVI images look excellent. Just to clarify a few things, I think the following are true: The NIR camera has had its IR block filter..." | Read more » | about 10 years ago | |||
| cfastie | "Nice photo. The NDVI results look quite believable, even for that complicated scene. In Fiji, when a fresh NDVI image is active, select Process/Ma..." | Read more » | about 10 years ago | |||
| cfastie | "The camera can't distinguish between NIR and other wavelengths, so it assumes that light getting to the blue pixels is mostly blue, light hitting t..." | Read more » | about 10 years ago | |||
| cfastie | "The Fiji plugin doesn't subtract anything, it just assumes you have a visible channel and a NIR channel. Once you remove the IR block filter, there..." | Read more » | about 10 years ago | |||
| cfastie | "I have a smartphone spectrometer, so maybe bring a cuvette to SNOWFEST and that should be all I need. " | Read more » | about 10 years ago | |||
| cfastie | "We have been hoping that it would be possible to do this in post processing. Put the 18% gray card (or some other card) in the scene and take the p..." | Read more » | about 10 years ago | |||
| cfastie | "You are going to make a lot of people envious with your lovely crisp images. The NIR photo looks as sharp as the VIS version, so I guess you have a..." | Read more » | about 10 years ago | |||
| cfastie | "CMOS sensors seem to handle IR light differently. There as been some limited comparison of CMOS and CCD Powershots. One hypothesis is that the colo..." | Read more » | about 10 years ago | |||
| cfastie | "This is a really good result. Why is NDVI artificially high in the shadows? In really dark parts of a photo, the values representing how bright eac..." | Read more » | about 10 years ago | |||
| cfastie | "Holy Mackerel. SCIENCE! This is a great use of the Public Lab spectrometer, and you are getting very good spectra with it. Does the RenekaBio ass..." | Read more » | about 10 years ago | |||
| cfastie | "Jeff, If you include the dimensions of the part of the spectrometer that inserts into the window, and the dimensions of the cuvettes, the next mock..." | Read more » | about 10 years ago | |||
| cfastie | "Tbtouaki, It sounds like you have a full spectrum camera, one that has the IR blocking filter removed and nothing replacing it. By placing a filte..." | Read more » | about 10 years ago | |||
| cfastie | "Benjamin Hickman posted his early results from a linear array spectrometer here: http://publiclab.org/notes/bhickman/10-12-2013/ccd-diodearray-spec..." | Read more » | about 10 years ago |