A5034241430- Remote Sensing in Agriculture
- Plant Water Relations and Carbon Dynamics
- Species Distribution and Climate Change
- Remote Sensing and Land Use
- Land Use and Ecosystem Services
- Hydrology and Drought Analysis
- Rangeland and Wildlife Management
- Climate change and permafrost
- Yeasts and Rust Fungi Studies
- Atmospheric and Environmental Gas Dynamics
- Remote Sensing and LiDAR Applications
- Plant Pathogens and Fungal Diseases
- Climate change impacts on agriculture
- Wheat and Barley Genetics and Pathology
- Climate variability and models
- Urban Heat Island Mitigation
- Horticultural and Viticultural Research
- Entomopathogenic Microorganisms in Pest Control
- Cryospheric studies and observations
- Tree-ring climate responses
- Fungal Plant Pathogen Control
- Geology and Paleoclimatology Research
- Fire effects on ecosystems
- Agriculture, Plant Science, Crop Management
- Soil Geostatistics and Mapping
United States Geological Survey
2014-2023
Earth Resources Observation and Science Center
2008-2019
University of Nebraska–Lincoln
1988-2018
Electromagnetic Geoservices (Norway)
2015
University of Sioux Falls
2003-2014
Pacific Island Ecosystems Research Center
2002-2009
Science Applications International Corporation (United States)
2007
NOAA National Environmental Satellite Data and Information Service
2005
RTX (United States)
1998-2002
University of New England
1983-1999
Researchers from the U.S. Geological Survey, University of Nebraska-Lincoln and European Commission's Joint Research Centre, Ispra, Italy produced a 1 km resolution global land cover characteristics database for use in wide range continental-to global-scale environmental studies. This provides unique view broad patterns biogeographical ecoclimatic diversity surface, presents detailed interpretation extent human development. The project was carried out as an International Geosphere-Biosphere...
Abstract. Vegetation phenological phenomena are closely related to seasonal dynamics of the lower atmosphere and therefore important elements in global models vegetation monitoring. Normalized difference index (NDVI) data derived from National Oceanic Atmospheric Administration's Advanced Very High Resolution Radiometer (AVHRR) satellite sensor offer a means efficiently objectively evaluating characteristics over large areas. Twelve metrics linked key events were computed based on...
Abstract Shifts in the timing of spring phenology are a central feature global change research. Long‐term observations plant have been used to track vegetation responses climate variability but often limited particular species and locations may not represent synoptic patterns. Satellite remote sensing is instead for continental monitoring. Although numerous methods exist extract phenological timing, start‐of‐spring (SOS), from time series reflectance data, comprehensive intercomparison...
A five‐year (2001–2005) history of moderate resolution imaging spectroradiometer (MODIS) normalized difference vegetation index (NDVI) and water (NDWI) data was analyzed for grassland drought assessment within the central United States, specifically Flint Hills Kansas Oklahoma. Initial results show strong relationships among NDVI, NDWI, conditions. During summer over Tallgrass Prairie National Preserve, average NDVI NDWI were consistently lower (NDVI < 0.5 0.3) under conditions than...
The development of new tools that provide timely, detailed-spatial-resolution drought information is essential for improving preparedness and response. This paper presents a method monitoring drought-induced vegetation stress called the Vegetation Drought Response Index (VegDRI). VegDRI integrates traditional climate-based indicators satellite-derived index metrics with other biophysical to produce 1 km map conditions can be produced in near-real time. initial results 2002 case study...
The evaluation of the relationship between satellite‐derived vegetation indices (normalized difference index and normalized water index) soil moisture improves our understanding how these respond to fluctuations. Soil deficits are ultimately tied drought stress on plants. diverse terrain climate Oklahoma, extensive network Oklahoma Mesonet, from Moderate Resolution Imaging Spectroradiometer (MODIS) provided an opportunity study correlations over 2002–2006 growing seasons. Results showed that...
A vegetation index and a radiative surface temperature were derived from satellite data acquired at approximately 1330 LST for each of 37 cities their respective nearby rural regions 28 June through 8 August 1991. Urban–rural differences the temperatures computed then compared to observed urban–rural in minimum air temperatures. The purpose these comparisons was evaluate use assess influence urban environment on (the heat island effect). temporal consistency data, daily weekly, biweekly,...
Abstract Global-change investigations have been hindered by deficiencies in the availability and quality of land-cover data. The U.S. Geological Survey University Nebraska-Lincoln collaborated on development a new approach to characterization that attempts address requirements global-change research community others interested regional patterns land cover. An experimental 1 -kilometer-resolution database characteristics for coterminous has prepared test evaluate approach. Using multidate...
Accurate geospatial information on the extent of irrigated land improves our understanding agricultural water use, local surface processes, conservation or depletion resources, and components hydrologic budget. We have developed a method in modeling framework that assimilates irrigation statistics with remotely sensed parameters describing vegetation growth conditions areas cover to spatially identify lands at 250-m cell size across conterminous United States for 2002. The model result,...
Abstract A vegetation index and radiative surface temperature were derived from NOAA-11 Advanced Very High Resolution Radiometer (AVHRR) data for the Seattle, WA region 28 June through 4 July 1991. The values computed locations of weather observation stations within compared to observed minimum air temperatures. These comparisons used evaluate use AVHRR assess influence urban environment on temperatures (the heat island effect). normalized difference (NDVI) radiant a one week composite...
Remotely monitoring changes in central U.S. grasslands is challenging because these landscapes tend to respond quickly disturbances and weather. Such dynamic responses influence nutrient cycling, greenhouse gas contributions, habitat availability for wildlife, other ecosystem processes services. Traditionally, coarse-resolution satellite data acquired at daily intervals have been used monitoring. Recently, the harmonized Landsat-8 Sentinel-2 (HLS) increased temporal frequency of data. Here...
Earth observation data are increasingly used to provide consistent eco-physiological information over large areas through time. Production efficiency models (PEMs) estimate Gross Primary (GPP) as a function of the fraction photosynthetically active radiation absorbed by canopy, which is derived from observation. GPP can be summed growing season and adjusted crop-specific harvest index yield. Although PEMs have many advantages other crop yield models, they not widely used, because performance...
Abstract. The increasing availability of high-quality remote sensing data and advanced technologies has spurred land cover mapping to characterize change from local global scales. However, most datasets either span multiple decades at a scale or limited time over larger geographic extent. Here, we present new surface dataset created by the Land Change Monitoring, Assessment, Projection (LCMAP) program conterminous United States (CONUS). LCMAP consists annual products period 1985–2017 30 m...
Abstract The vegetation drought response index (VegDRI), which combines traditional climate- and satellite-based approaches for assessing conditions, offers new insights into the impacts of from local to regional scales. In 2011, U.S. southern Great Plains, includes Texas, Oklahoma, New Mexico, was plagued by moderate extreme that intensified an extended period record-breaking heat. 2011 presented ideal case study evaluate performance VegDRI in characterizing developing conditions....