Community research

bhamster commented on NDVI and NRG 3 months ago

@cfastie Aha, thanks so much for the modified image! And for the context.

bhamster commented on NDVI and NRG 3 months ago

This is a really clear and helpful explanation, thanks @nedhorning. And thank you for pointing o...

alejobonifacio commented on Post your photos of possible wastewater pollution! / ¡Postea tus fotos de aguas posiblemente residuales! 📷 3 months ago

¡Hola! Los últimos días fui al río Suquía en Córdoba, Argentina y tomé algunas fotos ...: flash d...

cfastie commented on NDVI and NRG 3 months ago

If you want to replace the image with the questionable text "Red, Green, Blue" with one modified ...

nedhorning commented on NDVI and NRG 3 months ago

NDVI uses an NIR and a Red band. Some documents have noted that instead of red you can any visibl...

sarasage commented on Announcing our newest Fellowship Team project! 3 months ago

Looking forward to seeing more about your project!

klausmayr commented on Creating orthomosaics with oblique aerial images from 1940s in Agisoft or other software? 3 months ago

@warren thank you for the recommendation! I'm trying it now and getting close, but I think it's p...

bhamster commented on NDVI and NRG 3 months ago

Hi @dlebauer, good catch, thanks for pointing this out. @cfastie, @nedhorning, @ektopyrotic, if ...

ruthnwaiganjo commented on Introducing a new Dashboard for PublicLab.org 3 months ago

Thank you so much! It was a pleasure working on the new dashboard! I loved the culture, the suppo...

Ag8n commented on How do I...use luminescence with the spectrometer? 3 months ago

I don't plan on making the modifications in the near future. If someone else would like to try i...

bhamster commented on How do I...use luminescence with the spectrometer? 3 months ago

I'm still in the information-gathering stage, so unfortunately haven't done any tests myself yet!...

Ag8n commented on How do I...use luminescence with the spectrometer? 3 months ago

Thank you for the help. Have you used ASTM D6592-1? It was written in 2001 and removed in 2010 ...

bhamster commented on How do I...use luminescence with the spectrometer? 3 months ago

Oh good point, and helpful to know that using chemi- or bioluminescence eases certain specs on ma...

dlebauer commented on NDVI and NRG 3 months ago

Great article - I noticed that the first image shows an equation (NIR-R|G|B)/(NIR+R|G|B). The way...

AnemometricalTwoStep commented on How to Open and Clean a PMS 5003 Air Sensor 4 months ago

+1 One of the channels in my PurpleAir started reporting a value of 0 constantly. I suspect I’m ...

waridrox commented on how to delete unwanted spectra? 4 months ago

Hi, this was recently fixed and now you can delete the spectrums which are not dependant on anoth...

alejobonifacio commented on What are some observable tell-tale signs of wastewater pollution? 4 months ago

Hi @jesseslone , this comment is to translate your answer that I consider very valuable. If it do...

bhamster commented on How do you make results from environmental monitoring personally meaningful to people? 4 months ago

Thanks for sharing your experience and these resources, @julia_e_masters, they're super helpful!

julia_e_masters commented on How do you make results from environmental monitoring personally meaningful to people? 4 months ago

In my experience, well-thought out data visualization is a huge benefit to making content digesti...

Ag8n commented on How do I...use luminescence with the spectrometer? 4 months ago

Thank you for the papers. Still working my way through them. Wanted to comment on the differenc...

Ag8n commented on ¿Cómo detectar abrillantadores ópticos (aguas residuales) yendo a un río? / How to detect optical brighteners (wastewater) going to a river? 4 months ago

Thank you! Regards

jeffalk commented on Is there a correlation between humidity and particulates in the air? 4 months ago

@Sara, I believe your question specifically refers to indoor air quality, specifically particula...

xose commented on ¿Cómo detectar abrillantadores ópticos (aguas residuales) yendo a un río? / How to detect optical brighteners (wastewater) going to a river? 4 months ago

Here the full Chandler - Lerner paper :) https://sci-hub.st/https://doi.org/10.1111/wej.12112

Ag8n commented on ¿Cómo detectar abrillantadores ópticos (aguas residuales) yendo a un río? / How to detect optical brighteners (wastewater) going to a river? 4 months ago

Found a file, labeled just 3414, that is a method for the analysis by fluorometer. They used 360...

xose commented on ¿Cómo detectar abrillantadores ópticos (aguas residuales) yendo a un río? / How to detect optical brighteners (wastewater) going to a river? 4 months ago

@xose awards a barnstar to alejobonifacio for their awesome contribution!

liz commented on City of New York's first-ever "Environmental Justice for All" report 4 months ago

Second comment period now open: https://www1.nyc.gov/site/sustainability/our-programs/environment...

alejobonifacio commented on ¿Cómo detectar abrillantadores ópticos (aguas residuales) yendo a un río? / How to detect optical brighteners (wastewater) going to a river? 4 months ago

Hi again @Ag8n! I've just read again the Research Paper Chandler, D. M., & Lerner, D. N. (201...

warren commented on How good is the PurpleAir sensor and what does it detect? 4 months ago

Just noting also a big round up of notes on humidity and fog with optical sensors here: https://...

warren commented on Is there a correlation between humidity and particulates in the air? 4 months ago

Hi Sara! Yes, in two broad ways that I've seen -- both in being able to distinguish particulates...

fongvania commented on We are measuring CO2 as an indicator of proper ventilation to reduce COVID transmission risk. Has anyone considered measuring relative humidity (from exhaled aerosols and droplets) as another indicator of risk? 4 months ago

Hi Dr. Pierce! Thanks for posing the question 👍 Indoor ventilation, while not the only aspect in...