Stephen J. Ventura

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Integration of energy crops into agricultural landscapes could promote sustainability if they are placed in ways that foster multiple ecosystem services and mitigate ecosystem disservices from existing crops. We conducted a modeling study to investigate how replacing annual energy crops with perennial energy crops along Wisconsin waterways could affect a(More)
The proposed Wisconsin Land Information System (WLIS) will be a statewide access mechanism for land related data. It will be a distributed Web-based system with heterogeneous data residing on local and state servers. One of the most important functions for WLIS is to integrate land use data across jurisdictions to enable decision-making for comprehensive(More)
1. Demo Description We demonstrate a semantic integration query system for heterogeneous data. We use diverse land use coding systems to illustrate our solution for semantic heterogeneity problems at the schema and value levels. Our demonstration consists of an enhanced Internet XML DBMS and a tool used to create mappings between ontologies and local data(More)
This paper describes a Web-based query system for semantically heterogeneous geospatial data. Our goal is to provide DBMS type query capabilities to a proposed statewide land information system. One of the main problems in querying distributed local data sources is the difference in semantics describing the characteristics (attributes) of spatial objects(More)
BACKGROUND Urban environments can increase risk for development of obesity, insulin resistance (IR), and type 2 diabetes mellitus (T2DM) by limiting physical activity. This study examined, in a cohort of urban Hispanic youth, the relationship between daily physical activity (PA) measured by GPS, insulin resistance and cardiovascular fitness. METHODS(More)
Problem: Planners, politicians, organizations, and citizens in many cities recognize community gardens as a vital part of urban food production. To fulfill community or organizational goals, it is helpful to systematically identify and assess urban vacant land that could be used as potential garden sites. Purpose: The technical purpose of this project was(More)
The Santa Fe River Watershed in Santa Fe County, New Mexico was identified as one of the top five high risk nonpoint source pollution areas out in the Rio Grande Basin. This watershed was selected to demonstrate the use of hydrologic modeling as a powerful tool for assessing the impacts of land management practices on erosion and sediment control at the(More)
Spatial aggregations of raster data based on the majority rule have been typically used in landscape ecological studies. It is generally acknowledged that (1) dominant classes increase in abundance while minor classes decrease in abundance or even disappear through aggregation processes; and (2) spatial patterns also change with aggregations. In this paper,(More)