Search Results - "VAN LEEUWEN, Willem J.D."

Remotely Sensed Changes in Vegetation Cover Distribution and Groundwater along the Lower Gila River by Hartfield, Kyle, Leeuwen, Willem J.D. van, Gillan, Jeffrey K.

“…Introduced as a soil erosion deterrent, salt cedar has become a menace along riverbeds in the desert southwest. Salt cedar replaces native species, permanently…”
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Intercomparison, interpretation, and assessment of spring phenology in North America estimated from remote sensing for 1982-2006 by WHITE, MICHAEL A, de BEURS, KIRSTEN M, DIDAN, KAMEL, INOUYE, DAVID W, RICHARDSON, ANDREW D, JENSEN, OLAF P, O'KEEFE, JOHN, ZHANG, GONG, NEMANI, RAMAKRISHNA R, van LEEUWEN, WILLEM J.D, BROWN, JESSLYN F, de WIT, ALLARD, SCHAEPMAN, MICHAEL, LIN, XIOAMAO, DETTINGER, MICHAEL, BAILEY, AMEY S, KIMBALL, JOHN, SCHWARTZ, MARK D, BALDOCCHI, DENNIS D, LEE, JOHN T, LAUENROTH, WILLIAM K

“…Shifts in the timing of spring phenology are a central feature of global change research. Long-term observations of plant phenology have been used to track…”
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Fractional snow cover estimation in complex alpine-forested environments using an artificial neural network by Czyzowska-Wisniewski, Elzbieta H., van Leeuwen, Willem J.D., Hirschboeck, Katherine K., Marsh, Stuart E., Wisniewski, Wit T.

“…There is an undisputed need to increase accuracy of Fractional Snow Cover (FSC) estimation in regions of complex terrain, especially in areas dependent on…”
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Prediction of Soil Moisture Content and Soil Salt Concentration from Hyperspectral Laboratory and Field Data by Xu, Chi, Zeng, Wenzhi, Huang, Jiesheng, Wu, Jingwei, VanLeeuwen, Willem JD

“…This research examines the simultaneous retrieval of surface soil moisture and salt concentrations using hyperspectral reflectance data in an arid environment…”
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Phenological dynamics of irrigated and natural drylands in Central Asia before and after the USSR collapse by Kariyeva, Jahan, van Leeuwen, Willem J.D.

“…► Institutional and land use changes can be detected with satellite time series data. ► Variation in vegetation phenology was significant with institutional…”
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Fine scale spatial urban land cover factors associated with adult mosquito abundance and risk in Tucson, Arizona by Landau, Katheryn I, van Leeuwen, Willem J D

“…It is currently unclear what role microhabitat land cover plays in determining the seasonal spatial distribution of Aedes aegypti and Culex quinquefasciatus,…”
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Trends and ENSO/AAO Driven Variability in NDVI Derived Productivity and Phenology alongside the Andes Mountains by Van Leeuwen, Willem, Hartfield, Kyle, Miranda, Marcelo, Meza, Francisco

“…Increasing water use and droughts, along with climate variability and land use change, have seriously altered vegetation growth patterns and ecosystem response…”
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Using MODIS-NDVI for the Modeling of Post-Wildfire Vegetation Response as a Function of Environmental Conditions and Pre-Fire Restoration Treatments by Leon, Jose Raul Romo, Van Leeuwen, Willem J.D., Casady, Grant M.

“…Post-fire vegetation response is influenced by the interaction of natural and anthropogenic factors such as topography, climate, vegetation type and…”
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Feasibility of Invasive Grass Detection in a Desertscrub Community Using Hyperspectral Field Measurements and Landsat TM Imagery by Olsson, Aaryn D., Van Leeuwen, Willem J.D., Marsh, Stuart E.

“…Invasive species’ phenologies often contrast with those of native species, representing opportunities for detection of invasive species with multi-temporal…”
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Estimating Winter Annual Biomass in the Sonoran and Mojave Deserts with Satellite- and Ground-Based Observations by Casady, Grant, Van Leeuwen, Willem, Reed, Bradley

“…Winter annual plants in southwestern North America influence fire regimes, provide forage, and help prevent erosion. Exotic annuals may also threaten native…”
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Phenological Characterization of Desert Sky Island Vegetation Communities with Remotely Sensed and Climate Time Series Data by Van Leeuwen, Willem J.D., Davison, Jennifer E., Casady, Grant M., Marsh, Stuart E.

“…Climate change and variability are expected to impact the synchronicity and interactions between the Sonoran Desert and the forested sky islands which…”
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Land surface albedo from the synergistic use of polar (EPS) and geo-stationary (MSG) observing systems: An assessment of physical uncertainties by van Leeuwen, Willem J.D, Roujean, Jean-Louis

“…This investigation aims at quantifying the various sources of uncertainties in the derivation of albedo products from geo-stationary and polar orbiting optical…”
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Improving Snow Water Equivalent Maps With Machine Learning of Snow Survey and Lidar Measurements by Broxton, Patrick D., Leeuwen, Willem J. D., Biederman, Joel A.

“…In the semiarid interior western USA, where a majority of surface water supply comes from mountain forests, high‐resolution aerial lidar‐based surveys are…”
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Forest density and snowpack stability regulate root zone water stress and percolation differently at two sites with contrasting ephemeral vs. stable seasonal snowpacks by Dwivedi, Ravindra, Biederman, Joel A., Broxton, Patrick D., Lee, Kangsan, van Leeuwen, Willem J.D., Pearl, Jessie K.

“…[Display omitted] •Snow and soil moisture dynamics inform a new framework for ecohydrologic seasonality.•Soil water under canopy is used faster at the seasonal…”
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Using Fine Resolution Remotely Sensed Data-Derived Land Cover to Inform Dryland State and Transition Models by van der Leeuw, Elisabeth, van Leeuwen, Willem J.D., Marsh, Stuart E., Archer, Steven R.

“…State and transition models (STMs) are widely used for organizing, understanding, and communicating complex information regarding ecological change. One…”
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Integrating drone imagery with existing rangeland monitoring programs by Gillan, Jeffrey K., Karl, Jason W., van Leeuwen, Willem J. D.

“…The recent availability of small and low-cost sensor carrying unmanned aerial systems (UAS, commonly known as drones) coupled with advances in image processing…”
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Viewing Woody-Plant Encroachment through a Social–Ecological Lens by WILCOX, BRADFORD P., BIRT, ANDREW, ARCHER, STEVEN R., FUHLENDORF, SAMUEL D., KREUTER, URS P., SORICE, MICHAEL G., VAN LEEUWEN, WILLEM J. D., ZOU, CHRIS B.

“…Grasslands and savannas worldwide have been dramatically altered by woody-plant encroachment (WPE). Maintaining remnant grasslands and restoring degraded…”
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Subseasonal to seasonal streamflow forecasting in a semiarid watershed by Broxton, Patrick D., Leeuwen, Willem J. D., Svoma, Bohumil M., Walter, James, Biederman, Joel A.

“…Operational streamflow forecasting is critically important to managers of river basins that supply water, hydropower, and flood protection. While seasonal…”
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Convergence in relationships between leaf traits, spectra and age across diverse canopy environments and two contrasting tropical forests by Wu, Jin, Chavana‐Bryant, Cecilia, Prohaska, Neill, Serbin, Shawn P., Guan, Kaiyu, Albert, Loren P., Yang, Xi, Leeuwen, Willem J. D., Garnello, Anthony John, Martins, Giordane, Malhi, Yadvinder, Gerard, France, Oliviera, Raimundo Cosme, Saleska, Scott R.

“…Leaf age structures the phenology and development of plants, as well as the evolution of leaf traits over life histories. However, a general method for…”
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Beyond greenness: Detecting temporal changes in photosynthetic capacity with hyperspectral reflectance data by Barnes, Mallory L, Breshears, David D, Law, Darin J, van Leeuwen, Willem J D, Monson, Russell K, Fojtik, Alec C, Barron-Gafford, Greg A, Moore, David J P

“…Earth's future carbon balance and regional carbon exchange dynamics are inextricably linked to plant photosynthesis. Spectral vegetation indices are widely…”
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