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  1. Using spatially explicit data to improve our understanding of land supply responses: An application to the cropland effects of global sustainable irrigation in the Americas

    09 Aug 2018 | Contributor(s): Nelson Benjamin Villoria, Jing Liu

    Land supply elasticities determine the rates of land conversion in global policy models. However, they are only available for few countries in the world. Therefore, analysts seeking to improve the spatial resolution of their models are forced to impose regionally homogeneous parameters...

  2. A spatio-temporal drought analysis for the Midwestern US

    15 Jun 2009 | Publications | Contributor(s): Rao S Govindaraju, Dev Niyogi

    Droughts are prolonged abnormalities of moisture deficits that vary widely across temporal and spatial scales. Many hydrometeorologic variables are used to monitor the status of a drought. However, because of the dependence structure between all affecting variables under various temporal windows,...

  3. A copula-based joint deficit index for droughts

    31 Mar 2010 | Publications | Contributor(s): Rao S Govindaraju

    Current drought information is based on indices that do not capture the joint behaviors of hydrologic variables. To address this limitation, the potential of copulas in characterizing droughts from multiplevariables is explored in this study. Starting from the standardized index (SI) algorithm, a...

  4. Urban Ecosystem Design

    07 Jun 2011 | Publications | Contributor(s): Daniel Gerardo Aliaga

    We address the open problem of spatial distribution of vegetation in urban environments by introducing a user-guided simulation and procedural system for integrating plants into the interactive design process of 3D urban models. Our approach uses as input 3D geometry of an urban layout from which...

  5. A Web-Based Interface for SWAT Modeling on the TeraGrid

    06 Jun 2011 | Publications | Contributor(s): Lan Zhao, Carol Song, Indrajeet Chaubey, Rao S Govindaraju

    The Soil and Water Assessment Tool (SWAT) is a river basin scale model developed by the USDA Agricultural Research Service (ARS). It is widely used by researchers in various scientific domains to study the impact of land management practices on water quantity, sediment, and water quality in large...

  6. Delivering Real-time Satellite Data to a Broader Audience

    06 Jun 2011 | Publications | Contributor(s): Lan Zhao, Carol Song, Larry Biehl

    This paper presents our work of enhancing the existing cyberinfrastructure using Web 2.0 technologies for delivering real time satellite data to a broader audience. As a resource provider on the TeraGrid, Purdue University hosts several data collections for earth and environmental research,...

  7. CSCAP-U2U Survey Enhancement Proposal

    08 Aug 2011 | Publications | Contributor(s): Melissa Widhalm, Linda Prokopy

    Collaborators from the CS-CAP and U2U projects have developed a funding proposal to support expansion of survey research into 26 critical Midwestern watersheds. This proposal is being submitted to numerous agencies and groups.

  8. USDA Year 2 Continuation Grant -- Project Narrative

    25 Aug 2011 | Publications | Contributor(s): Melissa Widhalm

    The Project Narrative submitted to USDA for the U2U Year 2 Continuation Grant includes 1) a work description for year 2 activities and 2) a year 1 progress update.

  9. A TeraGrid Science Gateway for Studying Hydrological Extremes using a Land Data Assimilation System

    06 Jun 2011 | Publications | Contributor(s): Dev Niyogi, Lan Zhao, Carol Song, Rao S Govindaraju

    A TeraGrid enabled science gateway to study surface hydrology is under development at Purdue University. Such a gateway is needed for class room and graduate research as well as for developing a multidisciplinary framework that integrates environmental observatories and tools for drought/flood...

  10. Evaluating a New Deposition Velocity Module in the Noah Land-Surface Model

    13 Jun 2011 | Publications | Contributor(s): Dev Niyogi

    The community Noah land-surface model (Noah LSM) has been modified tocouple with a photosynthesis-transpiration scheme (GEM) to estimate the deposition veloc-ity (Vd ) for air quality studies. This new capability of the Noah-GEM model was testedin a point version of the National Center for...