cfastie 299 research notes and 550 wiki edits | Joined about 6 years ago | Admin

The ecology and history of forests and landscapes, and new ways to see these things. High-resolution stitched images of vegetation, including low elevation aerial photography and multispectral imaging. Design and distribution of 3D printed aerial photography rigs and microcontroller gadgets via the KAPtery. Tweeting these things.

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75 activities posted

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No output signal on IR kit timer

by cfastie about 7 years ago | 17 | 133 views | 0


Tiny remote control

by cfastie about 7 years ago | 2 | 133 views | 1


Visible/IR mapping camera process

by cfastie about 7 years ago | 1 | 35 views | 0


Good shutter synchronization

by cfastie about 7 years ago | 4 | 85 views | 0


Almost synchronous shutters

by cfastie about 7 years ago | 0 | 68 views | 0


Grassroots NDVI - time series

by cfastie about 7 years ago | 2 | 154 views | 0


Dual camera KAP rig

by cfastie about 7 years ago | 15 | 293 views | 0


View these maps at MapKnitter.org »

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Comments

Comment Last activity Moderation
"Some blue filters including Wratten 47, Schott BG3, and Rosco 2007 are dual bandpass red-rejection filters. They require that blue light be used fo..." | Read more » about 2 years ago
"Stitching Mobius photos can be hard. The longer lens will help. Correcting the distortion afterwards can help. A high shutter speed and vibration d..." | Read more » about 2 years ago
" The red filters typically used do not transmit much green light, so the green channel captures mostly NIR. Some yellow filters pass red and green,..." | Read more » about 2 years ago
"I have not worked with water chemistry sensors, but your first impression might be a good one -- a device that can send encoded concentrations of N..." | Read more » about 2 years ago
"With certain red filters replacing the NIR cut filter, instead of red, green, and blue channels, you get red+NIR, NIR, and NIR channels. Without ad..." | Read more » about 2 years ago
"When the NIR cut filter is removed from a camera, all three color channels capture NIR light in addition to the color they originally captured (R, ..." | Read more » about 2 years ago
"Those male + female headers would be really handy. This is the first time I have used a Nano without headers, and it makes a really tidy package fo..." | Read more » about 2 years ago
"Hi Liz, The components wired together weigh 33 grams and the bracket weighs 8 g. The batteries to power it weigh a lot more than that. A case with ..." | Read more » about 2 years ago
"The text file attached above gives the correct RGB values for the NDVI_VGYRM lookup table. I put an image of the NDVI_VGYRM color gradient in my an..." | Read more » about 2 years ago
"I think the algorithm to convert a blue- or red-filtered NIR photo to color NDVI is something like this: Start with a color photo in which one ch..." | Read more » about 2 years ago
"Peegar is an academic project at the University of Tokyo which provides browser-based graphical programming of a microcontroller. It "uses audio c..." | Read more » about 2 years ago
"Regarding using a battery with voltage near the top of the acceptable range, apparently some voltage regulators convert the voltage to the desired ..." | Read more » about 2 years ago
"I don't know how low the voltage has to get before the Riffle starts to misbehave. @Donblair designated the 3.5v to 6v range, so he must have based..." | Read more » about 2 years ago
"What are the voltage requirements: are there upper and lower limits? The silkscreen on the Riffle says 3.5v to 6v for the "general" power connecti..." | Read more » about 2 years ago
"I have not tried to stitch Mobius photos nor have I used Photoscan. I have stitched many infrared photos including blue- or red-filtered (NGB or RG..." | Read more » about 2 years ago
"You can use any filter that blocks most blue and green light (all visible light other than red) and also passes a lot of near infrared light (somew..." | Read more » about 2 years ago
"Finding inexpensive, do-it-yourself calibration targets is an obstacle to NDVI calibration. You need targets for which the spectral reflectance is ..." | Read more » about 2 years ago
"Photoshop. Also easy with Fiji. Probably also possible with many photo editing programs. " | Read more » about 2 years ago
"Trying slightly different values could yield better results in some situations. CLF_SYSCFG.TXT " | Read more » about 2 years ago
"I agree that the rubber band trick is a very clever hack and a critical way to lower the barriers to entry to remote interval shooting. This resear..." | Read more » about 2 years ago
"Here is my discussion of calibrating NDVI images: https://publiclab.org/notes/cfastie/05-01-2016/calibration-cogitation And Ned's most recent note..." | Read more » about 2 years ago
"I am a little confused about some of the suggestions here. I like the advice of using a camera with at least 10MP because it ensures that the came..." | Read more » about 2 years ago
"There are a few misleading things about these suggestions. The "Easiest" approach to interval shooting might be to use a camera with that feature ..." | Read more » about 2 years ago
"Structure from motion could be done with ground based photos, especially if the camera was on a tall pole. Multiple photos would be needed which in..." | Read more » about 2 years ago

cfastie was awarded the Basic Barnstar by warren for their work published in Superblue.


cfastie was awarded the Basic Barnstar by warren for their work published in Graze anatomy.


cfastie was awarded the Basic Barnstar by liz for their work published in Holiday Beverage Whodunit.


cfastie was awarded the Basic Barnstar by stevie for their work published in Nano particle monitoring.


cfastie was awarded the Basic Barnstar by Elidacanup for their work published in Broadening.


cfastie was awarded the Basic Barnstar by david-days for their work published in Compost is hot, says Riffle.


cfastie was awarded the Basic Barnstar by academicfora for their work published in A standalone aerial sensor pod.


cfastie was awarded the Empiricism Barnstar by warren for their work published in Grating angle.


cfastie was awarded the Empiricism Barnstar by xose for their work published in Real time and temperature.


cfastie was awarded the Photo Documentation Barnstar by warren for their work published in A DIY low power timer.


cfastie was awarded the Photo Documentation Barnstar by Hudonnoodles for their work published in Spherical KAP over Cocodrie.


cfastie was awarded the Photo Documentation Barnstar by stevie for their work published in NE Organizers Summit.


cfastie was awarded the Photo Documentation Barnstar by stevie for their work published in LEAFFEST 2014 accounting.


cfastie was awarded the Photo Documentation Barnstar by stevie for their work published in Public Lab Organizers Summit, 2014.


cfastie was awarded the Photo Documentation Barnstar by stevie for their work published in Putting sensor data to work.


cfastie was awarded the Photo Documentation Barnstar by todgobblins for their work published in Soaring Riffle.


cfastie was awarded the Video Documentation Barnstar by warren for their work published in SNOWFEST the Movie.


cfastie was awarded the Video Documentation Barnstar by mathew for their work published in Making the aluminum frame of an aerial camera rig (video).



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