A5076223864- Rangeland and Wildlife Management
- Fire effects on ecosystems
- Land Use and Ecosystem Services
- Hydrology and Watershed Management Studies
- Remote Sensing in Agriculture
- Botany, Ecology, and Taxonomy Studies
- Ecology and Vegetation Dynamics Studies
- Archaeology and Natural History
- Flood Risk Assessment and Management
- Agriculture and Rural Development Research
- Atmospheric and Environmental Gas Dynamics
- Hydrology and Drought Analysis
- Remote Sensing and LiDAR Applications
- Tropical and Extratropical Cyclones Research
- Forest Management and Policy
- Climate variability and models
- French Urban and Social Studies
- Conservation, Biodiversity, and Resource Management
- Species Distribution and Climate Change
- Cryospheric studies and observations
- Remote Sensing and Land Use
- Tree-ring climate responses
- Peatlands and Wetlands Ecology
- Climate change and permafrost
- Disaster Management and Resilience
United States Geological Survey
2012-2024
Western Geographic Science Center
2010-2024
California Science Center
2015
United States Department of the Interior
2012
Southern University
2007
Dakota State University
2007
San Jose State University
2005
Global environmental change scenarios have typically provided projections of land use and cover for a relatively small number regions or using coarse resolution spatial grid, only few major sectors. The coarseness global projections, in both thematic dimensions, often limits their direct utility at scales useful management. This paper describes methods to downscale land-use land-cover from the Intergovernmental Panel on Climate Change's Special Report Emission Scenarios ecological...
Information on future land‐use and land‐cover (LULC) change is needed to analyze the impact of LULC ecological processes. The U.S. Geological Survey has produced spatially explicit, thematically detailed projections for conterminous United States. Four qualitative quantitative scenarios were developed, with characteristics consistent Intergovernmental Panel Climate Change (IPCC) Special Report Emission Scenarios (SRES). four quantified (A1B, A2, B1, B2) served as input forecasting (FORE‐SCE)...
In addition to biodiversity conservation, California rangelands generate multiple ecosystem services including livestock production, drinking and irrigation water, carbon sequestration. rangeland ecosystems have experienced substantial conversion residential land use more intensive agriculture. To understand the potential impacts services, we developed six spatially explicit (250 m) climate/land change scenarios for Central Valley of surrounding foothills consistent with three...
To assess how montane meadow vegetation recovered after a wildfire that occurred in Yosemite National Park, CA 1996, Google Earth Engine image processing was applied to leverage the entire Landsat Thematic Mapper archive from 1985 2012. Vegetation greenness (normalized difference index (NDVI)) summarized every 16 days across 28-year time series for 26 meadows. Disturbance event detection hindered by subtle influence of low-severity fire on vegetation. A hard break (August 1996) identified...
Anthropogenic land use will likely present a greater challenge to biodiversity than climate change this century in the Pacific Northwest, USA. Even if species are equipped with adaptive capacity migrate face of changing climate, they encounter human-dominated landscape as major dispersal obstacle. Our goal was identify, at ecoregion-level, protected areas close proximity lands higher likelihood future land-use conversion. Using state-and-transition simulation model, we modeled spatially...
Mapping surface water over time provides the spatially explicit information essential for hydroclimatic research focused on droughts and flooding. Hazard risk assessments management planning also rely accurate, long-term measurements describing hydrologic fluctuations. Stream gages are a common measurement tool used to better understand flow inundation dynamics, but gage networks incomplete or non-existent in many parts of world. In such instances, satellite imagery may provide only data...
Open access to Landsat satellite data has enabled annual analyses of modern land-use and land-cover change (LULCC) for the Central California Valley ecoregion between 2005 2010. Our LULCC estimates capture landscape-level responses water policy changes, climate, economic instability. From 2010, agriculture in region fluctuated along with regulatory-driven changes allocation as well persistent drought conditions. Grasslands shrublands declined, while developed lands increased former...
Abstract A complete, spatially explicit dataset illustrating the 21st century mining footprint for conterminous United States does not exist. To address this need, we developed a semi‐automated procedure to map country's (30‐m pixel) and establish baseline monitor changes in mine extent over time. The process uses seed points derived from U.S. Energy Information Administration (EIA), Geological Survey (USGS) Mineral Resources Data System (MRDS), USGS National Land Cover Dataset (NLCD)...
Abstract In the southwestern U.S., meteorological phenomenon known as atmospheric rivers (ARs) has gained increasing attention due to its strong connections floods, snowpacks, and water supplies in West Coast states. Relatively less is about ecological implications of ARs, particularly interior Southwest, where AR storms are common. To address this gap, we compared a chronology landfalls on west coast between 1989 2011 25°N 42.5°N annual metrics normalized difference vegetation index (NDVI;...
Accurate monitoring of surface water location and extent is critical for the management diverse resource phenomena. The multi-decadal archive Landsat satellite imagery punctuated by missing data due to cloud cover during acquisition times, hindering assembly a continuous time series inundation dynamics. This study investigated whether streamflow volume measurements could be integrated with fill gaps in monthly chronologies Central Valley region California, USA, from 1984 2015. We aggregated...
Abstract Satellite imagery is commonly used to map surface water extents over time, but many approaches yield discontinuous records resulting from cloud obstruction or image archive gaps. We applied the Dynamic Surface Water Extent (DSWE) model downscaled (250‐m) daily Moderate Resolution Imaging Spectroradiometer (MODIS) data in Google Earth Engine generate monthly maps for conterminous United States (US) 2003 through 2019. The aggregation of observations maximum extent produced with...
ABSTRACT A fundamental question in arid land management centers on understanding the long‐term effects of fire desert ecosystems. To assess surface topography, soil roughness, and vegetation, we used terrestrial (ground‐based) LiDAR to quantify differences between burned unburned surfaces by creating a series high‐resolution vegetation structure bare‐earth models for six sample plots Grand Canyon‐Parashant National Monument, Arizona. We find that 11 years following prescribed burns, mound...
Post-fire recovery trajectories in ponderosa pine (Pinus Laws.) forests of the southwestern United States are increasingly shifting away from pre-burn vegetation communities. This study investigated whether phenological metrics derived a multi-decade remotely sensed imagery time-series could differentiate among grass, evergreen shrub, deciduous, or conifer-dominated replacement pathways. We focused on 10 fires that burned Arizona and New Mexico, USA before year 2000. A total 29 sites with...
Abstract Optical satellite imagery is commonly used for monitoring surface water dynamics, but clouds and cloud shadows present challenges in assembling complete time series. To test whether the daily revisit rate of Moderate Resolution Imaging Spectroradiometer (MODIS) can reduce obstruction improve high‐frequency mapping, we compared map results derived from Landsat (30‐m) MODIS (250‐m) data across state California 2003–2019. We adapted Dynamic Surface Water Extent (DSWE) model Google...
Evidence of past events and modeling potential future suggest that tsunamis are significant threats to communities on the open-ocean Strait Juan de Fuca coasts Washington. Although tsunami-inundation zones from a Cascadia Subduction Zone (CSZ) earthquake have been delineated, amount type human development in tsunami-prone areas not documented. A vulnerability assessment using geographic-information-system tools was conducted document variations developed land, populations, economic assets,...
The processes of landscape change are complex, exhibiting spatial variability as well linear, cyclical, and reversible characteristics. To better understand the various that cause transformation, a data aggregation, validation, attribution approach was developed applied to an analysis Southeastern Coastal Plains (SECP). integrates information from available national land-use, natural disturbance, land-cover efficiently assess spatially-specific changes causes. Between 2001 2006, affected...
Abstract Conservation of montane meadows is a high priority for land and water managers given their critical role in buffering the effects climate variability vulnerability to increasing temperatures evaporative demands. Recent advances cloud computing have provided new opportunities examine ecological responses over past few decades at large spatial scales. In this study, we characterized sensitivities (magnitude direction slope) meadow vegetation interannual variations climate. We...
First posted January 11, 2016 For additional information, contact: Director, National Geospatial Program U.S. Geological Survey 12201 Sunrise Valley Drive 511 Center Reston, VA 20192 Email:3dep@usgs.gov http://www.usgs.gov/ngpo/ http://nationalmap.gov/3DEP/ The (USGS) utilizes light detection and ranging (lidar) enabling technologies to support many science research activities. Lidar-derived metrics products have become a fundamental input complex hydrologic hydraulic models, flood...
The U.S. Geological Survey Land Cover Trends Project is releasing a 1973–2000 time-series land-use/land-cover dataset for the conterminous United States. contains 5 dates of data 2,688 sample blocks randomly selected within 84 ecological regions. nominal maps are 1973, 1980, 1986, 1992, and 2000. were classified manually from Landsat Multispectral Scanner, Thematic Mapper, Enhanced Mapper Plus imagery using modified Anderson Level I classification scheme. resulting has 60-meter resolution...
Invasive annual grasses are of concern in much the western United States because they tolerate resource variability and have high reproductive capacity, with propagules that readily dispersed disturbed areas like those created maintained for energy development. Early season invasive “green up” earlier than most native plants, producing a distinct pulse greenness early spring can be exploited to identify their location using multi-date imagery. To determine if increased around developments...