Community research

cfastie commented on anyone working on dataloggers for snow depth? about 2 hours ago

I think a laser rangefinder might work well for this. Put it on a pole and point it downward to m...

MadTinker commented on How to collect a water sample 3 days ago

We take two different samples: one sample is used for local chemistry analysis (alkalinity, pH, h...

stevie commented on How to collect a water sample 4 days ago

Thanks @MadTinker! Question for you - The sample bottles I found here are a little smaller than o...

MadTinker commented on How to collect a water sample 4 days ago

Nice explanation. I do this a few times a month and this is the same procedure accepted in Colora...

TC1994 new contributor commented on Horticultural Spectrometer - Assembly III 4 days ago

Hi @jenjimah, thank you so much for sharing your work. I have a question, did this final assembly...

nanocastro commented on Nuestros Suelos: a low-cost toolkit for the participative assessment of soil degradation 5 days ago

Hola Si, estamos trabajando desde hace ya un tiempo con Fernan. Estaría buenísimo si pudiéramos c...

macapola commented on Microscope not focusing right 5 days ago

HI! I have the same problem, did you find any solutions?

Meculus new contributor commented on Microscope not focusing right 6 days ago

I can get it to focus somewhat, but with an onion skin (the main thing I tried), and try to focus...

stevie commented on Build a plant-based air purifier 6 days ago

That makes sense! Thanks for clarifying. On Wed, Jan 15, 2020 at 7:22 PM \<notifications@publ...

warren commented on WHATS THE PRICE OF THE SPECTROMETER 3? 6 days ago

Hi, we have a few different options here! https://store.publiclab.org/collections/spectrometry

lev29 new contributor commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 7 days 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? 7 days ago

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

larsonreever commented on A Card Game Approach to Community Mapping 7 days ago

I did this! These approaches to the problem made me think of a new way to create and discuss crea...

cfastie commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 8 days ago

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

lev29 new contributor commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 8 days 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? 8 days ago

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

lev29 new contributor commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 8 days 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? 8 days ago

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

stevie commented on What is the air flow requirement for air sampling tubes? Any inexpensive method? 10 days 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? 10 days 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 :) 10 days 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? 10 days ago

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

radimir_cacic09 commented on Just some tests :) 11 days ago

Item 1 Item 2 Item 3

liz commented on Terrain Surveying with Emery Boards 11 days 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"? 11 days 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? 11 days 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? 11 days 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 12 days 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 12 days 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 13 days ago

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