| 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 » | over 6 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 » | over 6 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 » | over 6 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 » | over 6 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 » | over 6 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 7 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 7 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 7 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 7 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 7 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 7 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 7 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 7 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 7 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 7 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 7 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 7 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 7 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 7 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 7 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 7 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 7 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 7 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 7 years ago |