| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| cfastie | "It will always be difficult to know for sure to what degree the red channel is contaminated by NIR. It might be worthwhile making an estimate. For ..." | Read more » | almost 5 years ago | |||
| cfastie | "Although the absolute values you computed for NDVI are lower than they should be, it appears that your process is successfully discriminating betwe..." | Read more » | almost 5 years ago | |||
| cfastie | "You are correct that both red and NIR pass through the red filter (Rosco Fire # 19) and both are captured in the red channel of the photograph. It ..." | Read more » | almost 5 years ago | |||
| cfastie | "There is another version of this sensor with the same specifications and the same price but it is about half the size. Does anyone know any reason ..." | Read more » | about 5 years ago | |||
| cfastie | "You are right that there has not been much follow-through at Public Lab on developing and testing DIY conductivity or total dissolved solids (TDS) ..." | Read more » | about 5 years ago | |||
| cfastie | "I am not sure what "full spectrum" means when used to describe LEDs. It probably means that all the visible wavelengths are present in the light at..." | Read more » | about 5 years ago | |||
| cfastie | "the Waterproof Mini Camera (infrared-ready) Be aware that this camera must be opened and modified before it can capture near infrared light. The p..." | Read more » | about 5 years ago | |||
| cfastie | "Stevie, The image code is still embedded in the version of my comment you promoted to an Answer. So I just copied the markdown into another comment..." | Read more » | over 5 years ago | |||
| cfastie | "The intense red tide blooms (Karenia brevis) in the Gulf of Mexico are easy to detect with normal color photography because they are red (top image..." | Read more » | over 5 years ago | |||
| cfastie | "That’s a great question, but it is a little bit like asking “How do you cook a good meal?” There are lots of different kinds of good meals, and lis..." | Read more » | over 5 years ago | |||
| cfastie | "I don't think calculations at Infragram.org can be used for anything but determining the color of a new image. The Photo Monitoring plugin and Fiji..." | Read more » | over 5 years ago | |||
| cfastie | "Kina, thanks for the videos. Very helpful. I might try CoolTerm again, since I was using a sketch that did not format the serial output in an appro..." | Read more » | over 5 years ago | |||
| cfastie | "I tried CoolTerm and never got it to work. I tried for only a half hour, so my failure is not so surprising. If you have a working data logger (e.g..." | Read more » | over 5 years ago | |||
| cfastie | "A GoPro Hero might weigh 150 grams with the protective case. A Hero Session weighs half that. On a static KAP rig the total weight will be 150g to ..." | Read more » | over 5 years ago | |||
| cfastie | "Liz, I don't know the specs of the 1/4" phone plug, but it needs only two contacts, the tip and one ring along the shaft. I'm not sure which types ..." | Read more » | over 5 years ago | |||
| cfastie | "New answer below where I could attach a file. " | Read more » | over 5 years ago | |||
| cfastie | "A 1/4" stereo/phone plug connects to the HCHO sensor and two wires from that cable connect to the Arduino (tip of plug to A3, ring to GND). Below (..." | Read more » | over 5 years ago | |||
| cfastie | "The first step might be to arrange for the co-location of the HCHO sensor, an Arduino, and somebody casually familiar with Arduino. Has the proper ..." | Read more » | over 5 years ago | |||
| cfastie | "Kina, Thanks for the great information. Liz, It might help to know more about this project. What is the time frame for deployment? What has been tr..." | Read more » | over 5 years ago | |||
| cfastie | "There is a very simple way to read the HCHO sensor with a resolution of about 10 ppb, assuming the range of the sensor is 0 to 1000ppb. (Out of the..." | Read more » | over 5 years ago | |||
| cfastie | "There is no information at the Public Lab store about what filter is used except that it is a red filter. I suspect the filter is a Rosco `#19 filt..." | Read more » | over 5 years ago | |||
| cfastie | "Blueish photos result when the blue channel is brighter than the other channels. Reddish or orangeish photos result when the red channel is brighte..." | Read more » | over 5 years ago | |||
| cfastie | "The blue filters used block red light, so the red channel records a lot of NIR, so NGB. The red filters used block blue light, so the blue channel ..." | Read more » | over 5 years ago | |||
| cfastie | "I think it is par for the course that a random proprietary sensor will not work gracefully with an Arduino. In this case, it might be that a standa..." | Read more » | over 5 years ago |