gretchengehrke commented on What are ways to record ambient temperature every 5 sec and export easily?

Hi @carohowe, this sounds like an interesting project! In addition to broadly looking at the impa...

5 comments » about 1 month ago

liz commented on Software for mapping trees?

Hi Sebastian, i know OpenTreeMap is quite a big platform at this point, but considering how many ...

4 comments » about 1 month ago

stevie commented on Seeking DC-area folks interested in building temperature sensors for urban heat island measurement

Hi! The I See Change project was in Harlem not DC, but it might be a good example to check out.

6 comments » about 1 month ago

nedhorning commented on Introducing the calibration plugin for ImageJ/Fiji

Hi Suman - Using Analyze => Measure should work. It's not uncommon to have high pixel values for ...

35 comments » about 1 month ago

warren commented on Web-based fisheye-removal prototype for correcting lens distortion

Actually i'm pretty jazzed for the possibility of some of actually doing the lens correction for ...

18 comments » about 1 month ago

warren commented on Seeking DC-area folks interested in building temperature sensors for urban heat island measurement

@stevie was talking about a project with ISeeChange.org in DC -- Stevie, did you have a link, or ...

6 comments » about 1 month ago

warren commented on "Use or calibrate calibration" dont show my reference CFL already calibrated

Hi, can you link to the spectra you're talking about so we can see? Thanks!

1 comments » about 1 month ago

BaptisteLeSergent commented on ramanPi - The 3D Printable Raspberry Pi Raman Spectrometer

Hello, Like Garret said a few days ago, we can't access the hackaday website anymore. Does anyon...

35 comments » about 1 month ago

suman commented on Introducing the calibration plugin for ImageJ/Fiji

Dear Ned Horning, I calculated image calibration coefficients, using the reflectance data from d...

35 comments » about 1 month ago

cfastie commented on Web-based fisheye-removal prototype for correcting lens distortion

I tried with a photo from a PowerShot S100. That's the only camera I have other than the Mobius t...

18 comments » about 1 month ago

warren commented on Mobius non-fish eye and small lifter wrapup

Hi, @patcoyle - managed (with some help) to get the web-based lens distortion removal system work...

2 comments » about 1 month ago

warren commented on Web-based fisheye-removal prototype for correcting lens distortion

OK - the GoPro clones can be corrected with: a: 1, b: 1, Fx: 0.16, Fy: 0.16, scale: 1.087, x: 1,...

18 comments » about 1 month ago

cfastie commented on Mini Pearl Jam

The Mini Pearl Logger in the compost pile stopped logging today when the battery voltage dropped ...

2 comments » about 1 month ago

warren commented on Web-based fisheye-removal prototype for correcting lens distortion

This was solved today by SpaVec! https://github.com/jywarren/fisheyegl/issues/3#issuecomment-315...

18 comments » about 1 month ago

ccpandhare commented on How to verify generated NDVI Images?

Hi Chris! I tested this image. Had the same results. I them made an improvement to the older algo...

10 comments » about 1 month ago

gretchengehrke commented on EDDI - Eletrodialysis Desalinator for Desalination

@mienaikoe, This is so cool! How quickly can you process a liter of sea water? Also, you mentione...

1 comments » about 1 month ago

gretchengehrke commented on Monitor transparency, dissolved oxygen, ORP, and ammonia from a river

@shanlter, this is great! Have you seen the spreadsheet on the www.publiclab.org/wiki/water-senso...

4 comments » about 1 month ago

liz commented on A Questions page to encourage discussions through better UX

Hi @siyuan , i just posted this github issue about what seems to be redundant clutter on the /que...

5 comments » about 1 month ago

warren commented on Sparkfun data logging troubleshooting?

Hi! sorry I missed this -- are you using a Raspberry Pi to run OpenPipeKit? If so, are you sure i...

5 comments » about 1 month ago

cfastie commented on How to verify generated NDVI Images?

These two sets of equations do not do the same thing. Set 1. var ndvi = 255 * (b - r) / (1...

10 comments » about 1 month ago

cfastie commented on Mini Pearl Jam

I checked on the Mini Pearl logger in the compost pile today and swapped SD cards. It was still l...

2 comments » about 1 month ago

warren commented on The Squid and the Rok

Great advice on the "tilting" fix -- this affected one of Liz's squids and we struggled to adjust...

3 comments » about 1 month ago

MadTinker commented on Build KnowFlow: automatic water moniter

@liz Sounds great. I think there are three parts and I'll probably ask for advice on posting as t...

50 comments » about 1 month ago

warren commented on MapKnitter Annotations Plugin: Preliminary Specification

Deleted some spam!

4 comments » about 1 month ago

shanlter commented on Build KnowFlow: automatic water moniter

@MadTinker, awesome!! I'm trying to get familiar with Public Lab's logic as well, I guess the bes...

50 comments » about 1 month ago

saangpe commented on Graze anatomy

You could give more details about how to process the images with Fiji and tried to replicate this...

8 comments » about 1 month ago

warren commented on Collaboratively write the new Pocket Guide to Grassroots Mapping

Saw some great suggestions -- i also added a "wind scale" table riffing on the Beaufort scale, wi...

1 comments » about 1 month ago

Garret commented on ramanPi - The 3D Printable Raspberry Pi Raman Spectrometer

The links to the hackaday website are no longer functional. Does anyone know of a working websit...

35 comments » about 1 month ago

MadTinker commented on Build KnowFlow: automatic water moniter

@rockets Thanks for the summary. I thought I was going to have to move in a different direction,...

50 comments » about 1 month ago

sid commented on Red vs. blue filters for NDVI

This is excellent work here! I was wondering how software could help eliminate the tedious task ...

32 comments » about 1 month ago