Miguel Villarreal, PhD
Dr. Miguel Villarreal is a Research Geographer with the Western Geographic Science Center at Moffett Field, CA.
Wildfire at the Crossroads

Fire is an essential ecological process and management tool but can also be detrimental to life and property. Our findings provide a new depiction of fire regimes in the Sky Islands that can help inform fire management, restoration and regional conservation planning, fostered by local and traditional knowledge and collaboration among landowners and managers.
Remote Sensing of Biological Soil Crusts

Determining the spatial extent and condition of biocrusts across landscapes continues to present considerable challenges to scientists. Remote sensing offers promising opportunities to detect and characterize biocrust communities, differentiate among biocrust community types, and monitor changes in biocrust distribution across dryland landscapes globally.
Miguel’s research involves using earth observation systems and spatial analyses to better understand how disturbances such as wildfire, invasive species, and energy development affect ecosystems, ecosystem services, and human communities, and to provide land managers information to help reduce risk and facilitate recovery after a disturbance. His geographic focus is on water-limited (dryland) regions of the west, which are particularly sensitive to complex interactions between human land use, natural disturbances, and climate change.
Miguel’s current research projects include studies of wildfire and wildlife in the Sky Island region of the U.S.-Mexico borderlands, monitoring the impacts and recovery of oil and gas and solar energy developments on the Colorado Plateau and Mojave Deserts, and mapping and monitoring biological soil crusts and invasive grasses across the western US. He works closely with federal agency partners (NPS, USFWS, BLM, USFS, DOD) to develop and implement research projects.
Current and recent research projects
- Remote Sensing for Resource Management, Project Chief (2015-Present)
- Southwest Energy Development and Reclamation (SWEDR), Co-Project Chief (2015-Present)
- Biological soil crust ecology and function from space, Co-Project Chief (2020-Present)
- Southern Border Fuels Management Initiative: Strategies to reduce fire risk and improve viewsheds along the U.S. southern border, Co-Investigator (2019-Present)
- Remote Sensing for Monitoring Riverside East Solar Development Focus Area (DFA) and for Desert Energy Transmission Corridors, Principal Investigator (2021-Present)
- Assessing change in forest density and fuel loads in the absence of fire (1941-2018) at Lassen Volcanic NP using historic aerial photos, Principal Investigator (2019-Present)
- Evaluating the response of California Delta riparian ecosystems to anthropogenic and climate stressors, Principal investigator (2019-2021)
- Detection and monitoring of fire-prone early season invasive grasses in the Southwest, Co-investigator (2020-2021)
- Wildfire probability mapping based on regional soil moisture models. Co-investigator, (2020-2022)
- Assessing Vulnerability to Drought in Dryland Ecosystems of the Western U.S. Co-investigator, (2016-2018)
Professional Experience
2011-Present: Research Geographer, U.S. Geological Survey
2011-2013: Mendenhall Fellow, U.S. Geological Survey
2009-2011: Postdoctoral Research Associate, School of Natural Resources and the Environment, University of Arizona
2006-2009: Research Associate, Arizona Remote Sensing Center, University of Arizona
2001- 2005: Research Associate, Geography and Regional Development, University of Arizona
Education and Certifications
Ph.D. and M.A. from the University of Arizona
B.A. from the University of California, Davis
Science and Products
Decadal shifts in grass and woody plant cover are driven by prolonged drying and modified by topo‐edaphic properties
Multi-index time series monitoring of drought and fire effects on desert grasslands
Comparison of remote sensing indices for monitoring of desert cienegas
Continuous 1985-2012 Landsat monitoring to assess fire effects on meadows in Yosemite National Park, California
Modelling landscape-scale erosion potential related to vehicle disturbances along the U.S.-Mexico border
Remote sensing analysis of riparian vegetation response to desert marsh restoration in the Mexican Highlands
Conflation and aggregation of spatial data improve predictive models for species with limited habitats: a case of the threatened yellow-billed cuckoo in Arizona, USA
Influence of monsoon-related riparian phenology on yellow-billed cuckoo habitat selection in Arizona
Vegetation inventory, mapping, and classification report, Fort Bowie National Historic Site
Historical and contemporary geographic data reveal complex spatial and temporal responses of vegetation to climate and land stewardship
Framing scenarios of binational water policy with a tool to visualize, quantify and valuate changes in ecosystem services
Mapping landscape phenology preference of yellow-billed cuckoo with AVHRR data
Science and Products
Decadal shifts in grass and woody plant cover are driven by prolonged drying and modified by topo‐edaphic properties
Multi-index time series monitoring of drought and fire effects on desert grasslands
Comparison of remote sensing indices for monitoring of desert cienegas
Continuous 1985-2012 Landsat monitoring to assess fire effects on meadows in Yosemite National Park, California
Modelling landscape-scale erosion potential related to vehicle disturbances along the U.S.-Mexico border
Remote sensing analysis of riparian vegetation response to desert marsh restoration in the Mexican Highlands
Conflation and aggregation of spatial data improve predictive models for species with limited habitats: a case of the threatened yellow-billed cuckoo in Arizona, USA
Influence of monsoon-related riparian phenology on yellow-billed cuckoo habitat selection in Arizona
Vegetation inventory, mapping, and classification report, Fort Bowie National Historic Site
Historical and contemporary geographic data reveal complex spatial and temporal responses of vegetation to climate and land stewardship
Framing scenarios of binational water policy with a tool to visualize, quantify and valuate changes in ecosystem services
Mapping landscape phenology preference of yellow-billed cuckoo with AVHRR data