Joshua B. Fisher
@jbfisher.bsky.social
Associate Professor of Environmental Science & Policy at Chapman University
Science Lead at Hydrosat, Inc.
Project Scientist at UCLA
Former ECOSTRESS Science Lead at NASA JPL
Opinions mine
Science Lead at Hydrosat, Inc.
Project Scientist at UCLA
Former ECOSTRESS Science Lead at NASA JPL
Opinions mine
I was named to the 2025 world’s “most influential” (top 1% by citations) scientists list (Clarivate Highly Cited Researchers 2025)!
November 19, 2025 at 3:42 AM
I was named to the 2025 world’s “most influential” (top 1% by citations) scientists list (Clarivate Highly Cited Researchers 2025)!
The Gifford Fire is the largest fire thus far this year in California. Captured by ECOSTRESS.
Data visualized by high-school student Krishiv Jaini
Data visualized by high-school student Krishiv Jaini
August 11, 2025 at 11:55 PM
The Gifford Fire is the largest fire thus far this year in California. Captured by ECOSTRESS.
Data visualized by high-school student Krishiv Jaini
Data visualized by high-school student Krishiv Jaini
Phoenix just hit the hottest Aug day in recorded history. ECOSTRESS saw it a couple days before with temps of 124F/51C at 9.20AM.
Data visualized by high-school student Kaitlin Cho.
Data visualized by high-school student Kaitlin Cho.
August 11, 2025 at 11:52 PM
Phoenix just hit the hottest Aug day in recorded history. ECOSTRESS saw it a couple days before with temps of 124F/51C at 9.20AM.
Data visualized by high-school student Kaitlin Cho.
Data visualized by high-school student Kaitlin Cho.
Happening now! Largest fire in France in nearly a hundred years. Captured by ECOSTRESS.
Data visualized by high school student Bill Chen.
Data visualized by high school student Bill Chen.
August 9, 2025 at 9:04 PM
Happening now! Largest fire in France in nearly a hundred years. Captured by ECOSTRESS.
Data visualized by high school student Bill Chen.
Data visualized by high school student Bill Chen.
Compilation of fires burning in Portugal as captured by ECOSTRESS.
This image was a collaboration from multiple high school students piecing together the individual fires.
Bill Chen Kaitlin Cho Krishiv Jaini Taara Reddy Ray Schaffer Lucas Zaninovich
This image was a collaboration from multiple high school students piecing together the individual fires.
Bill Chen Kaitlin Cho Krishiv Jaini Taara Reddy Ray Schaffer Lucas Zaninovich
August 9, 2025 at 2:56 AM
Compilation of fires burning in Portugal as captured by ECOSTRESS.
This image was a collaboration from multiple high school students piecing together the individual fires.
Bill Chen Kaitlin Cho Krishiv Jaini Taara Reddy Ray Schaffer Lucas Zaninovich
This image was a collaboration from multiple high school students piecing together the individual fires.
Bill Chen Kaitlin Cho Krishiv Jaini Taara Reddy Ray Schaffer Lucas Zaninovich
Sending ❤️ to Portugal, half of which is on fire right now. This fire, outside of Serabigões, captured by ECOSTRESS a few days ago.
August 6, 2025 at 5:06 AM
Sending ❤️ to Portugal, half of which is on fire right now. This fire, outside of Serabigões, captured by ECOSTRESS a few days ago.
Interesting volcanic activity happening at Hawai’i, captured by ECOSTRESS. Volcanic activity here seems to have accelerated anomalously since Dec.
Image captured by 16-year-old Shreyas Chatterjee working with me this summer.
Image captured by 16-year-old Shreyas Chatterjee working with me this summer.
August 4, 2025 at 6:03 AM
Interesting volcanic activity happening at Hawai’i, captured by ECOSTRESS. Volcanic activity here seems to have accelerated anomalously since Dec.
Image captured by 16-year-old Shreyas Chatterjee working with me this summer.
Image captured by 16-year-old Shreyas Chatterjee working with me this summer.
Progression of Evaporative Stress from ECOSTRESS leading up to the Palisades fire in LA earlier this year. Things start off generally alright, then those winds smacked into LA and fast-dried the veg, which fueled the uncontrollable fires.
August 1, 2025 at 5:07 AM
Progression of Evaporative Stress from ECOSTRESS leading up to the Palisades fire in LA earlier this year. Things start off generally alright, then those winds smacked into LA and fast-dried the veg, which fueled the uncontrollable fires.
One of my students, Bill Chen, was looking at the Airport Fire in SoCal from last year using ECOSTRESS. Interesting to see the topographic variability in the temperatures.
July 30, 2025 at 8:37 PM
One of my students, Bill Chen, was looking at the Airport Fire in SoCal from last year using ECOSTRESS. Interesting to see the topographic variability in the temperatures.
Hydrosat picked up this scorching heatwave sweeping Europe yesterday. Surface temperatures exceeding 67C/150F! It’s great that we can now capture these temps at high resolution globally and with increasing frequency towards daily as we continue to get our constellation online. Stay safe out there!
July 3, 2025 at 4:50 PM
Hydrosat picked up this scorching heatwave sweeping Europe yesterday. Surface temperatures exceeding 67C/150F! It’s great that we can now capture these temps at high resolution globally and with increasing frequency towards daily as we continue to get our constellation online. Stay safe out there!
New paper using ECOSTRESS and machine learning that predicted Australia’s black summer fires a week ahead of occurrence, mostly using high resolution water use efficiency and evaporative stress data.
zslpublications.onlinelibrary.wiley.com/doi/full/10....
zslpublications.onlinelibrary.wiley.com/doi/full/10....
June 29, 2025 at 6:19 AM
New paper using ECOSTRESS and machine learning that predicted Australia’s black summer fires a week ahead of occurrence, mostly using high resolution water use efficiency and evaporative stress data.
zslpublications.onlinelibrary.wiley.com/doi/full/10....
zslpublications.onlinelibrary.wiley.com/doi/full/10....
Currently in Costa Rica with a NASA team flying drones over my elevated CO2 sites.
NASA/Milan Loiacono
NASA/Milan Loiacono
May 18, 2025 at 4:05 AM
Currently in Costa Rica with a NASA team flying drones over my elevated CO2 sites.
NASA/Milan Loiacono
NASA/Milan Loiacono
New paper on the latest in science and applications synergies between high-resolution soil moisture and ET!
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
May 14, 2025 at 1:17 PM
New paper on the latest in science and applications synergies between high-resolution soil moisture and ET!
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
Work led by Robert Bogue linked to our ELEVATE project using geological CO2 as a natural FACE experiment. Trees got greener with more CO2. Biological CO2 sensors and data loggers!
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
April 16, 2025 at 3:41 PM
Work led by Robert Bogue linked to our ELEVATE project using geological CO2 as a natural FACE experiment. Trees got greener with more CO2. Biological CO2 sensors and data loggers!
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
Today I went to the OC Fire Authority Headquarters and Emergency Command Center. We learned about their critical information needs and how we can integrate our technology into their decision-support systems to optimize fire management and emergency response.
April 15, 2025 at 2:31 AM
Today I went to the OC Fire Authority Headquarters and Emergency Command Center. We learned about their critical information needs and how we can integrate our technology into their decision-support systems to optimize fire management and emergency response.
I'm very excited to share some of Hydrosat's new data from our first satellite! We really can get high resolution thermal (+VNIR) data from space at a very small fraction of the cost of traditional satellites. The future is bright for TIR remote sensing!
hydrosat.com/2025/03/25/h...
hydrosat.com/2025/03/25/h...
March 25, 2025 at 4:36 PM
I'm very excited to share some of Hydrosat's new data from our first satellite! We really can get high resolution thermal (+VNIR) data from space at a very small fraction of the cost of traditional satellites. The future is bright for TIR remote sensing!
hydrosat.com/2025/03/25/h...
hydrosat.com/2025/03/25/h...
Taking some air quality measurements at the [former] home of my friend, Blake. We also tested air and took soil samples from the nearby school that Blake and his community is considering putting their kids back into.
February 3, 2025 at 2:45 AM
Taking some air quality measurements at the [former] home of my friend, Blake. We also tested air and took soil samples from the nearby school that Blake and his community is considering putting their kids back into.
I just got back from New Mexico training over a hundred state, federal, and university employees on how to use a new tool we developed for managing water resources.
A water manager said our system is a "game changer...that will revolutionize our work," potentially saving the State millions of $.
A water manager said our system is a "game changer...that will revolutionize our work," potentially saving the State millions of $.
February 2, 2025 at 6:53 AM
I just got back from New Mexico training over a hundred state, federal, and university employees on how to use a new tool we developed for managing water resources.
A water manager said our system is a "game changer...that will revolutionize our work," potentially saving the State millions of $.
A water manager said our system is a "game changer...that will revolutionize our work," potentially saving the State millions of $.
We figured out how much water is in all of Earth’s plants and how long it takes water to flow through them.
Answer: 786 km3 and 5-18 days.
@canopyinclouds.bsky.social
@koen-hufkens.bsky.social
Answer: 786 km3 and 5-18 days.
@canopyinclouds.bsky.social
@koen-hufkens.bsky.social
January 10, 2025 at 4:35 AM
We figured out how much water is in all of Earth’s plants and how long it takes water to flow through them.
Answer: 786 km3 and 5-18 days.
@canopyinclouds.bsky.social
@koen-hufkens.bsky.social
Answer: 786 km3 and 5-18 days.
@canopyinclouds.bsky.social
@koen-hufkens.bsky.social
This is one of the largest fire fronts at high res I’ve seen from ECOSTRESS—spanning hundreds of km in the Bolivian Amazon. Detected by undergrad student, Nettie Hitt, at Wesleyan U., working with Helen Poulos on materials developed by @canopyinclouds.bsky.social, Jeremy Forsythe, and myself.
January 7, 2025 at 3:08 AM
This is one of the largest fire fronts at high res I’ve seen from ECOSTRESS—spanning hundreds of km in the Bolivian Amazon. Detected by undergrad student, Nettie Hitt, at Wesleyan U., working with Helen Poulos on materials developed by @canopyinclouds.bsky.social, Jeremy Forsythe, and myself.
AGU Wed 12/11: check these out. One by our team using balloons over fires for tree-level continuous TIR for firefighters. Another by my postdoc Gabriela Shirkey using ISS synergies for biodiversity. In the PM, Ph.D. student Shahryar Fazli will talk on hyperspectral-TIR for water-nutrients dynamics.
December 11, 2024 at 5:58 AM
AGU Wed 12/11: check these out. One by our team using balloons over fires for tree-level continuous TIR for firefighters. Another by my postdoc Gabriela Shirkey using ISS synergies for biodiversity. In the PM, Ph.D. student Shahryar Fazli will talk on hyperspectral-TIR for water-nutrients dynamics.
NASA JPL asked me to represent them on behalf of ECOSTRESS to the press today at AGU. I taught reporters from The Washington Post, NPR, etc., how to download data from the ISS and make a heat map. At the end, one reporter exclaimed, “Is working with all of NASA’s data this easy?”
December 11, 2024 at 4:44 AM
NASA JPL asked me to represent them on behalf of ECOSTRESS to the press today at AGU. I taught reporters from The Washington Post, NPR, etc., how to download data from the ISS and make a heat map. At the end, one reporter exclaimed, “Is working with all of NASA’s data this easy?”
AGU Tuesday Dec 10. Some of my co-author presentations: cool work spanning cutting-edge thermal across arctic ecosystems, proximal RS, ET, and diurnal cycling!
@jingfengxiao.bsky.social
@jingfengxiao.bsky.social
December 10, 2024 at 5:12 AM
AGU Tuesday Dec 10. Some of my co-author presentations: cool work spanning cutting-edge thermal across arctic ecosystems, proximal RS, ET, and diurnal cycling!
@jingfengxiao.bsky.social
@jingfengxiao.bsky.social
New ECOSTRESS products available! 70 m soil moisture, relative humidity, air temperature, net radiation 😮!
lpdaac.usgs.gov/news/more-ec...
#lpdaac #appeears
lpdaac.usgs.gov/news/more-ec...
#lpdaac #appeears
December 3, 2024 at 5:32 PM
New ECOSTRESS products available! 70 m soil moisture, relative humidity, air temperature, net radiation 😮!
lpdaac.usgs.gov/news/more-ec...
#lpdaac #appeears
lpdaac.usgs.gov/news/more-ec...
#lpdaac #appeears