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lev29 commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 9 months ago

Thank you, Chris! You've given me much to read and think about, but please, don't misconstrue tha...

cfastie commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 9 months ago

Using green foliage (or chlorophyll) to set a custom white balance deserves more consideration th...

cfastie commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 9 months ago

The goal of the custom white balance hack is to fool the camera into wildly exaggerating the brig...

lev29 commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 9 months ago

Thank you so much, Chris! With respect to what to use as a reference to calibrate the White Balan...

cfastie commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 9 months ago

If your K610 filter is a cutoff filter that passes wavelengths greater than 610nm and blocks shor...

lev29 commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 9 months ago

Thank you, Chris, for helping to clarify my question. In fact, as you suspected, I was misusing t...

cfastie commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 9 months ago

`>> for simple bandpass filters, I use the letter "K" followed by the approximate cutoff wa...

dwhite01 commented on Introduction to Spectrometry (& Building a Spectrometer!) Lesson 9 months ago

The instructions for the Papercraft spectrometer Kit are terrible!!What part of the DVD are we su...

stevie commented on What is the air flow requirement for air sampling tubes? Any inexpensive method? 9 months ago

I know @mathew did some work a number of years ago exploring air flow. Here's a link to some of t...

stevie commented on Which is more accurate in measuring formaldehyde: air sampling tubes vs RKI FP-30? 9 months ago

@nshiparo I was wondering if you have any ideas on these questions, or know who else we might rea...

radimir_cacic09 commented on Just some tests :) 9 months ago

Let’s see how this works with images or an embedded video. Is \ *markdown * parsed? Number 1...

keshavgarg234156 commented on What are ways to make dense CSV data more readable? 9 months ago

Whenever we have such large numbers of columns then we first perform correlation analysis before ...

radimir_cacic09 commented on Just some tests :) 9 months ago

Item 1 Item 2 Item 3

liz commented on Terrain Surveying with Emery Boards 9 months ago

thanks for explaining this application Scott, i understand it better now. Thank you for all your ...

liz commented on Is there a way to make a cheaper "UV Hound"? 9 months ago

Sharing back a response from Bryan Parras with permission: I'd love to be a part of developing a...

Ag8n commented on What is the air flow requirement for air sampling tubes? Any inexpensive method? 9 months ago

Check with the individual sampling tubes for airflow requirements. Most manufacturers also sell ...

Ag8n commented on Air sampling tubes for formaldehyde: which brand is accurate? 9 months ago

In industry, we commonly used draeger tubes to measure for a number of contaminants. There are o...

warren commented on Build a plant-based air purifier 9 months ago

Hi, I believe I remember @nshapiro saying that it provided a substrate for bacteria to grow - lot...

cfastie commented on Adafruit Feathers for datalogging 9 months ago

I have not heard of anyone using a microcontroller (Arduino or ESP board) to read data from an SD...

stevie commented on Build a plant-based air purifier 9 months ago

@bostonfern and I were wondering what the purpose of the gravel is here. What function does it se...

stevie commented on Build a plant-based air purifier 9 months ago

@bostonfern and I were wondering what the purpose of the gravel is here. What function does it se...

Ag8n commented on What are the health impacts of the Aluf Plastics Plant from air pollution? 9 months ago

In the past, this company was using PVC ( polyvinylchloride). If this is still being used, the m...

sureta commented on Nuestros Suelos: a low-cost toolkit for the participative assessment of soil degradation 9 months ago

Hola Nano. Excelente. Nosotros felices de explorar formas de colaboración. Está muy bueno lo que ...

stevie commented on Emery Board as Bathymeter: ETP vs Beau Bayou 9 months ago

@stevie awards a barnstar to eustatic for their awesome contribution!

nanocastro commented on Nuestros Suelos: a low-cost toolkit for the participative assessment of soil degradation 9 months ago

hola @sureta estamos en Mendoza trabajando con gente de comunidad campesina tratando de desarroll...

sureta commented on Nuestros Suelos: a low-cost toolkit for the participative assessment of soil degradation 9 months ago

Hi, Thanks for your interest in Nuestros Suelos! We're in the process of producing materials abou...

eustatic commented on Terrain Surveying with Emery Boards 9 months ago

Update from Naomi. This was a rush build, and crews were still out re-burying the pipeline in la...

eustatic commented on Terrain Surveying with Emery Boards 9 months ago

Update from Naomi. This was a rush build, and crews were still out re-burying the pipeline in la...

mukeshpaik commented on Is there a way to make a cheaper "UV Hound"? 9 months ago

Very Helpful information,thanks

stevie commented on What are the health impacts of the Aluf Plastics Plant from air pollution? 9 months ago

This came in from Molly Jacobs, Environmental Health Initiative Project Manager at the Lowell Cen...

musings on conflict resilience

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