Comments

Author Comment Last activity Moderation
cfastie "Hi Shanlter, That's a good question. There is no 5V-out pin on the Riffle, but there is a "VBAT" pin on the 2x7 pin header. I assume that pin carr..." | Read more » over 4 years ago
cfastie "The only files used here are the photos themselves. You can right click and "open in new tab" and then "save image as" to get these images. " | Read more » over 4 years ago
cfastie "Here is another way to weld thermocouples: https://publiclab.org/notes/Vern/10-30-2017/making-thermocouples. I'm not sure which method is more resp..." | Read more » over 4 years ago
cfastie "Ah, those were the days. I miss having containers of mercury available for projects. Here is the post from @kinasmith about welding thermocouples w..." | Read more » over 4 years ago
cfastie "I have not compared to see if replacing the filter changes the lens distortion, but it probably does some. Adding an internal filter can have a sub..." | Read more » over 4 years ago
cfastie "Yes, any photo can be processed using the NDVI equation to get an NDVI image. My answer above explains why the resulting NDVI image might not be ve..." | Read more » over 4 years ago
cfastie "Another thing that makes tag pages sort of mysterious is that you can get to one by searching for "https://publiclab.org/tag/balloon-mapping", but ..." | Read more » over 4 years ago
cfastie "Hi Tommy, I just learned last month that when you search for a tag that has been used at publiclab.org you can get two different results. If the t..." | Read more » over 4 years ago
cfastie "Thanks Zengirl. I don't think you can buy a NASA Aeropod. You can license the technology from NASA and manufacture them, but I don't know if anyone..." | Read more » over 4 years ago
cfastie "The new filter can be inside the camera or in front of the lens. If it is in front, it will get scratched and might be bent (not flat), but it is e..." | Read more » over 4 years ago
cfastie "A goat is way better than brown M&Ms. But that is not exactly my motivation here because I'm sure everybody reads my research notes extremely ..." | Read more » over 4 years ago
cfastie "I don't know how much LEDs vary in their NIR emission. But it's easy to add some NIR LEDs to the mix. There is an advantage to using only artificia..." | Read more » over 4 years ago
cfastie "The NIR illumination is probably not needed because daylight is a very consistent source of lots of NIR (although using NIR illumination at night c..." | Read more » over 4 years ago
cfastie "There are a couple of reasons that the photos from a modified NIR camera will not produce useful NDVI results unless some adjustments are made: N..." | Read more » over 4 years ago
cfastie "That depends on where the article is published. Some publishers are stricter than others. It's usually okay to post the abstract of the article an..." | Read more » over 4 years ago
cfastie "Hi Zengirl. We missed you bigly. Turns out Katie's a rock hound. Who knew? (no, Public Lab, this is not a question). She went all in on the geology..." | Read more » over 4 years ago
cfastie "Nice rock photos. This is really a comment on the previous answer, but if you leave comments in the comment place then you can't drag images in. An..." | Read more » over 4 years ago
cfastie "Yes, I found that simplified map which I thought would be appropriate, but then I noticed that the polygons were not located very accurately. So I ..." | Read more » over 4 years ago
cfastie "The bedrock under LEAFFEST HQ is Cheshire quartzite, a half billion year old Cambrian metasedimentary rock. It is buried deeply at the house under ..." | Read more » over 4 years ago
cfastie "It's a common artifact to get higher NDVI values from the darker areas of foliage in DIY infrared photos. The computation of NDVI depends not only ..." | Read more » over 4 years ago
cfastie "I am intrigued to think about this topic in the context of earlier Public Lab discussions of expertise. Do you have to be an expert to be a leader?..." | Read more » over 4 years ago
cfastie "That's really good that @rjstatic may be coming. And it's really good that registration is still open. Gotta know soon how many there will be. " | Read more » over 4 years ago
cfastie "Every one of the Public Lab tools could be the focus of a great classroom project. There have been attempts to create a curriculum outline for spec..." | Read more » over 4 years ago
cfastie "There are lots of good looking fungi in the woods these days. I think it will be a good annual foray. These from today: A puffball, maybe Lycoper..." | Read more » over 4 years ago