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warren 8151 research notes and wiki edits | Admin

The creator of GrassrootsMapping.org and co-founder and Research Director for Public Lab, Jeffrey Warren designs mapping and civic science tools and professionally flies balloons and kites. Notable software he has created include the vector-mapping framework Cartagen and orthorectification tool MapKnitter, as well as open spectral database and toolkit Spectral Workbench.

He served from 2015-17 as Vice President of the board of the Open Source Hardware Association, is on the board of alternative education program Parts and Crafts in Somerville MA, and an advocate of open source software, hardware, and data. He co-founded Vestal Design, a graphic/interaction design firm in 2004, and directed the Cut&Paste Labs project, a year-long series of workshops on open source tools and web design in 2006-7 with Lima designer Diego Rotalde.

Jeff holds an MS from MIT and a BA in Architecture from Yale University, and spent much of that time working with artist/technologist Natalie Jeremijenko, building robotic dogs and stuff. To find out more, visit Unterbahn.com.


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103 questions asked

217 answers posted

53 activities posted

6 activities attempted


Joined about 7 years ago

Spectrometer calibration guidelines

by warren over 6 years ago | 0 | 1,030 | 0



Mockup for Spectral Workbench redesign

by warren over 6 years ago | 0 | 1,525 | 2

Spectral Workbench development continues: https://github.com/jywarren/spectral-workbench/issue...

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Barataria and other ground photos for inclusion in future Archive map entries

by warren over 6 years ago | 0 | 5,196 | 0

(From: https://www.flickr.com/photos/labucketbrigade/4819440323/in/photostream) **Port Sulphur...

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iPhone 4 and Evo 4G phones have back-illuminated UV-sensitive cameras

by warren over 6 years ago | 1 | 3,587 | 0

These back-illuminated CMOS sensors would be great for UV-visible spectroscopy... just a note for...

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Video tutorial: Creating false-color NDVI with aerial wetlands imagery

by warren over 6 years ago | 16 | 16,300 | 5

<iframe width="480" height="360" src="https://www.youtube.com/embed/-nNnWEHNO_w" frameborder="0" ...

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Francisca Rojas of Transparency Policy Project on PLOTS

by warren over 6 years ago | 0 | 2,063 | 2

As part of our research on how groups are using technology to enable more effective forms of tr...

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Video tutorial: Creating infrared composites of aerial wetlands imagery

by warren over 6 years ago | 0 | 8,547 | 1

I've been doing video tutorials on different techniques for infrared analysis. Here's the latest:...

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Using color/contrast enhancement to see into water in aerial photos

by warren over 6 years ago | 0 | 2,566 | 1

This image is from Barataria Bay in early Oct 2011. The enhanced image is on the left. What are t...

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MapKnitter 1.0 released today, turn aerial photos into GeoTiffs!

by warren over 6 years ago | 0 | 3,292 | 0

Heyo mappers! Last month we promised a MapKnitter 1.0 by the "end of September" and alt...

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Discovering hydrocarbon leaks with UV photography?

by warren over 6 years ago | 0 | 2,800 | 0

Wow, great insider info on identifying hydrocarbon leaks from ultraviolet photography... thanks N...

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PBS post on Brooklyn mapping projects and recent imagery

by warren over 6 years ago | 0 | 2,292 | 2

Liz Barry just posted this great overview of recent Brooklyn maps on the PBS Mediashift IdeaLab b...

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Video tutorial: Intro to MapKnitter.org

by warren over 6 years ago | 0 | 2,885 | 0

<iframe width="480" height="360" src="https://www.youtube.com/embed/NOikqxIIFBc" frameborder="0" ...

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Trees, Chainsaws, Protest and Balloons

by warren over 6 years ago | 0 | 2,003 | 2

Blog post <a href="http://grassrootsmapping.org/2011/09/trees-chainsaws-protest-and-balloons/...

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Arsenic detection with UV-Vis spectrometry

by warren over 6 years ago | 2 | 7,270 | 1

I was reading up on how to detect arsenic in soil, since the UMASS soil tests offered at such gre...

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"...when the hydrogen sulfide concentration reaches approximately 15 ppm, the human nose becomes desensitized"

by warren over 6 years ago | 0 | 2,894 | 2

http://chemsee-foods.com/hydrogen-sulfide-monitoring/H2S-KT1 Hydrogen sulfide is a flammable...

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Temperature and humidity sensors to correct H2S sensor

by warren over 6 years ago | 0 | 3,556 | 2

The Figaro TGS 825 hydrogen sulfide sensor needs to be corrected for ambient temperature and humi...

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Wetlands erosion in Bayou St Denis, Louisiana

by warren over 6 years ago | 0 | 2,061 | 2

Grassroots Mapping imagery overlaid on Bing aerial imagery from unknown year.

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Plume spectrometry test in Garfield County

by warren over 6 years ago | 0 | 1,762 | 2

Paul and I see if we can detect anything coming out of a chimney at a gas extraction site.

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Battlement Mesa Concerned Citizens Bucket Brigade

by warren over 6 years ago | 0 | 2,256 | 2

Bob demonstrates air sample collection with a bucket.

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Prototype H2S sensor

by warren over 6 years ago | 0 | 3,240 | 0

VERY basic code here: https://github.com/jywarren/plots-sensorkit Figaro TGS825 sensor datas...

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Hydrogen sulfide sensing brainstorm

by warren over 6 years ago | 0 | 1,123 | 0


Open Hardware SCHOLARSHIP - deadline sept 14th

by warren over 6 years ago | 0 | 1,279 | 2

---------- Forwarded message ----------From: "Ayah Bdeir" ...

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Arduino + Figaro hydrogen sulfide sensor

by warren over 6 years ago | 1 | 7,975 | 0

With sample code: Some time ago I had nasty smells in my kitchen and no I didn’t leave an eg...

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View these maps at MapKnitter.org »

Title Creation date Image


role:organizer skill:coding organizers place:somerville-ma organizer location:blurred place:somerville github:jywarren instagram:unterbahn group:education lat:41 lon:-71 wwg