Jessica J Walker
Jessica started with the USGS as a Mendenhall Postdoctoral Researcher in 2014.
Jessica's broad research interests center on the analysis of landscape change using remote sensing data. Past projects have included tracking the vegetative trajectories of areas recovering from fire events, both in the semi-arid, high-elevation forests of Arizona and the boreal forests of Alaska. Additional recent work includes examining surface inundation patterns via Landsat and MODIS imagery as part of the PLACE project (Patterns in the Landscape - Analyses of Cause and Effect).
Education and Certifications
2012 - Ph.D. Geospatial and Environmental Analysis, Virginia Tech
2000 - M.A. Geography, University of Arizona, Tucson
1991 - B.A. Applied Math, Williams College
Science and Products
Filter Total Items: 14
Mapping presence and predicting phenological status of invasive buffelgrass in southern Arizona using MODIS, climate and citizen science observation data
The increasing spread and abundance of an invasive perennial grass, buffelgrass (Pennisetum ciliare), represents a critical threat to the native vegetation communities of the Sonoran desert in southern Arizona, USA, where buffelgrass eradication is a high priority for resource managers. Herbicidal treatment of buffelgrass is most effective when the vegetation is actively growing, but the remotenes
Authors
Cynthia S.A. Wallace, Jessica J. Walker, Susan M. Skirvin, Caroline Patrick-Birdwell, Jake F. Weltzin, Helen Raichle
Phenological response of an Arizona dryland forest to short-term climatic extremes
Baseline information about dryland forest phenology is necessary to accurately anticipate future ecosystem shifts. The overarching goal of our study was to investigate the variability of vegetation phenology across a dryland forest landscape in response to climate alterations. We analyzed the influence of site characteristics and climatic conditions on the phenological patterns of an Arizona, USA,
Authors
Jessica J. Walker, Kirsten de Beurs, Randolph Wynne
Science and Products
Filter Total Items: 14
Mapping presence and predicting phenological status of invasive buffelgrass in southern Arizona using MODIS, climate and citizen science observation data
The increasing spread and abundance of an invasive perennial grass, buffelgrass (Pennisetum ciliare), represents a critical threat to the native vegetation communities of the Sonoran desert in southern Arizona, USA, where buffelgrass eradication is a high priority for resource managers. Herbicidal treatment of buffelgrass is most effective when the vegetation is actively growing, but the remotenes
Authors
Cynthia S.A. Wallace, Jessica J. Walker, Susan M. Skirvin, Caroline Patrick-Birdwell, Jake F. Weltzin, Helen Raichle
Phenological response of an Arizona dryland forest to short-term climatic extremes
Baseline information about dryland forest phenology is necessary to accurately anticipate future ecosystem shifts. The overarching goal of our study was to investigate the variability of vegetation phenology across a dryland forest landscape in response to climate alterations. We analyzed the influence of site characteristics and climatic conditions on the phenological patterns of an Arizona, USA,
Authors
Jessica J. Walker, Kirsten de Beurs, Randolph Wynne