Comments

Author Comment Last activity Moderation
cfastie "This looks like a great project. The photos used for structure from motion models should have a few characteristics: They should be high image qu..." | Read more » almost 5 years ago
cfastie "Here is a strange development. This action camera has a 1MP sensor. It is a 1/4" sensor which has an area of 10 square mm. The native image size is..." | Read more » almost 5 years ago
cfastie "Gretchen, It looks like some of the sensors in the Water Sensor wiki could be hacked to work with an Arduino based data logger, but you would want..." | Read more » almost 5 years ago
cfastie "Although this question was pasted verbatim from another site, a link was added to the text "DS18B20." This link was not in the original StackExchan..." | Read more » almost 5 years ago
cfastie "There could be innocent or devious motivations for you to paste, without attribution, this exact question from StackExchange which was asked and an..." | Read more » almost 5 years ago
cfastie "Do you have access to an Arduino to try with the DHT21? You might be able to confirm that the sensor is working or learn that the sensor is the pro..." | Read more » almost 5 years ago
cfastie "Thanks Pat. And thanks for your comment and support 3.5 years ago when I posted the first Redstone note. Some things never change. " | Read more » almost 5 years ago
cfastie "Right click -- got it! I added the corrected version above. Yes, I think most point and shoot cameras correct for lots of lens artifacts before t..." | Read more » almost 5 years ago
cfastie "I tried with a photo from a PowerShot S100. That's the only camera I have other than the Mobius that has a fairly wide angle lens (24mm equiv.). Bu..." | Read more » almost 5 years ago
cfastie "What do you mean it will batch them at the bottom? Is the information saved? Or do we have to write it all down? " | Read more » almost 5 years ago
cfastie "The Mini Pearl Logger in the compost pile stopped logging today when the battery voltage dropped too low. Four AAA eneloops ran the logger for 13.5..." | Read more » almost 5 years ago
cfastie "How is the GPS reception at the base of these trees? Is it good enough to get usable waypoints for each tree? " | Read more » almost 5 years ago
cfastie "A data logger based on an Arduino microcontroller is well suited to the task of recording temperature every few seconds. The simplest Arduino combi..." | Read more » almost 5 years ago
cfastie "These two sets of equations do not do the same thing. Set 1. var ndvi = 255 * (b - r) / (1.00 * b + r); Set 2. var ndvi = (b - r) / (..." | Read more » almost 5 years ago
cfastie "The algorithm looks good. I guess the next question is does Infragram use the exact same algorithm? (only coders know for sure) The test image you..." | Read more » almost 5 years ago
cfastie "I checked on the Mini Pearl logger in the compost pile today and swapped SD cards. It was still logging after 7.5 days, so that's a new record. I n..." | Read more » almost 5 years ago
cfastie "I have been meaning to do a post about the Tangerine Rokkaku. I have yet to have a full KAP session with it so I hope that will happen soon. Here i..." | Read more » almost 5 years ago
cfastie "The photos were processed with the Photo Monitoring plugin for FIJI which has a complete users guide. If you have any questions you can describe an..." | Read more » almost 5 years ago
cfastie "Here is an easy camera rig you can build yourself. A parts list and complete instructions for making one are in this research note: https://publ..." | Read more » almost 5 years ago
cfastie "When someone reports about a mapping session, I am always interested to know about: Which kite? Which camera? How did you control the camera? Wha..." | Read more » almost 5 years ago
cfastie "Sid, Pretty big difficulties. The sensor does not know what hit it. Each pixel produces a value for brightness (for one channel) which depends on ..." | Read more » almost 5 years ago
cfastie "A simple option might be to turn on some NIR LEDs when the photography happens. The NIR:VIS ratio might not match sunlight, but if you know what it..." | Read more » almost 5 years ago
cfastie "Thanks for adding a photo. NDVI is based on the assumption that the light illuminating the foliage has a certain proportion of NIR and VIS -- the p..." | Read more » almost 5 years ago
cfastie "Using two cameras solves one of the two problems I described (mixed NIR and VIS). That problem can also be solved by measuring or making assumption..." | Read more » almost 5 years ago