cfastie 299 research notes and 550 wiki edits | Joined over 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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4 questions asked

1271 comments posted

75 activities posted

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NDVI validation

aldrin asked about almost 3 years ago

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Correct Config. File & Trobule shooting2

will123 asked about almost 3 years ago

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What are important aspects to consider about replication on the website and in the community?

liz asked about almost 3 years ago

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Has anyone used a timelapse camera in stream monitoring?

stevie asked about almost 3 years ago

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Infragram Point and Shoot Plant Cam

alexrfholland asked about almost 3 years ago

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Question: What is the Open Source Community's Take the MIT License?

nshapiro asked about almost 3 years ago

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How to neutralize/remove the source's spectra to obtain absorption spectra?

shubham asked about almost 3 years ago

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Spectrometer from a drone

sylvainbonhommeau asked about about 3 years ago

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Question: Infragram point & shoot image

ino asked about about 3 years ago

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Question: Why average? And what happens to the second Green?

viechdokter asked about about 3 years ago

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Difference CFL and Tube light?

Joris asked about about 3 years ago

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Question: ccd camera on metascop

leanr asked about over 3 years ago

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Automated captures?

viechdokter asked about over 3 years ago

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Question: How to I convert the spectrum from the webcam to a spectral power density graph.

cjtiaan asked about over 3 years ago

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Question: How do I measure the absorption spectrum of a sample?

lucca_fabani asked about over 3 years ago

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Question:Can diy infrared imaging be used for natural gas leaks as the EDF did in So California

marlokeno asked about over 3 years ago

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How can one Infragram photo produce different NDVI results?

cfastie asked about over 3 years ago

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How do I set a custum white balance of the NoIR modulo cam?

LaPa asked about over 3 years ago

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Question: What does the vertical scale mean?

someHerrings asked about over 3 years ago

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Question: Determining Plant-Health

kiranay asked about almost 4 years ago

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First Drone Flight and White Balance Issues

amck asked about almost 4 years ago

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View these maps at MapKnitter.org »

Title Creation date Image

Comments

Comment Last activity Moderation
"I have not used graphing for live debugging because I didn't know how easy it was to do. I use the live serial monitor in the Arduino IDE all the t..." | Read more » over 1 year ago
"This is a terrific result for one of your first flights. The photography is very high quality because of the good decisions you made. If this is yo..." | Read more » over 1 year ago
"I know nothing about this topic, but here is the model I concocted from whole cloth to understand it. Measuring conductivity of water with electro..." | Read more » over 1 year ago
"This is a great trick. I have made a bunch of these. If you are doing this with a cheap USB cable, you might want to check the red and black wires ..." | Read more » over 1 year ago
"There is also lots of good information in this research note by Don about some testing he did. " | Read more » over 1 year ago
"There has been a lot of information about measuring turbidity posted at Public Lab. Don Blair posted an excellent review of the common approaches t..." | Read more » over 1 year ago
"Kestrel makes a well-thought-out data logger called Kestrel Drop. The Drop D2 logs temperature and humidity apparently for six months. You can retr..." | Read more » over 1 year ago
"Spectrometers based on consumer cameras, like the Public Lab spectrometers, can be built so they provide good information about which narrow wavele..." | Read more » over 1 year ago
"First, mark the position of the three screws. When you remove them, count the number of rotations needed to unscrew them. So you will need marks on..." | Read more » over 1 year ago
"The rules for flying drones are different from the rules for flying kites or balloons. The rule that flying is prohibited within five miles of an a..." | Read more » over 1 year ago
"The Public Lab desktop spectrometer is quite capable of making a spectral graph of sunlight reflected from grass. The curve will differ from the pr..." | Read more » over 1 year ago
"An infragram photo file does not contain enough information to produce a normal color image of the scene. The infragram filter blocks most of the b..." | Read more » over 1 year ago
"So, the values in the graph are computed as follows? The values from the camera for each channel (R, G, B) range from 0 (no light) to 255 (maximum..." | Read more » over 1 year ago
"The signature of ripe coconuts might be distinguishable from some of the other things in the photos, but not necessarily everything else in the pho..." | Read more » over 1 year ago
"I don't know of published results of studies comparing red and blue filters. Red light has been used for the visible part of the NDVI equation for ..." | Read more » over 1 year ago
"Computing NDVI requires a value for the "brightness" of both red light and near infrared light for the same part of a scene (or for each pixel). Un..." | Read more » over 1 year ago
"Yes, I agree that this is a different approach to an issue that has had a lot of effort directed at software solutions. This is a purely hardware s..." | Read more » over 1 year ago
"Hi Adam, Those thermoelectric fans are very smart. This guy on YouTube shows how to make one with a $3.00 thermoelectric module and parts recycled..." | Read more » over 1 year ago
"Oh, you're right. The older lut used in the images above can be found here: https://publiclab.org/wiki/photo-monitoring-plugin " | Read more » over 1 year ago
"The lut file for use in Fiji is available for download here: https://publiclab.org/notes/cfastie/08-26-2014/new-ndvi-colormap In a comment to that..." | Read more » over 1 year ago
"What Fiji does is a bit confusing. In a normal histogram the x-axis is brightness so 0 (at the left end) is black and 255 (at the right end) is max..." | Read more » over 1 year ago
"Fiji made that histogram of the color NDVI image. The NDVI image is not an RGB color image (it is a single channel image with a color look up table..." | Read more » over 1 year ago
"I don't think there is any debate about what those words mean, but I find it hard to use them correctly all the time. The only sensors I have used ..." | Read more » over 1 year ago
"I used Fiji (ImageJ) to make the histograms of the NDVI images. Fiji will make a couple of different kinds. " | Read more » over 1 year 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.


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


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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.


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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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