Bridges are crucial for transporting people and goods, but their failures can be catastrophic, resulting in loss of life property. This study assessed the flood stage selected bridges (Alaafin Avenue, Seven-Up, Oluyole) along Ona River, Ibadan, Nigeria, using a one-dimensional model called Hydraulic Engineering Center-River Analysis System (HEC-RAS). The requires two major input data: geometric...

Often the components of a problem can be arrayed on a two-dimensional information space (e.g., abstract tree or Hypertext) far too large to fit onto the display screen of a workstation. With current navigation techniques it is often difficult for users to keep track of their location or to move rapidly to remote locations in the space. We developed two similar direct-manipulation techniques tha...

It is often necessary to estimate the zone of contribution to, or the capture zone developed by, pumped wells: for example, when evaluating pump-and-treat remedies and when developing wellhead protection areas for supply wells. Tonkin and Larson (2002) and Brochu and Marcotte (2003) describe a mapping-based method for estimating the capture zone of pumped wells, developed by combining universal...

Zonae Cogito is a free software package that couples Marxan with a MapWindow GIS interface to provide practitioners with an easy to use GIS to support Marxan analysis. In addition to providing a method for visualizing Marxan output, Zonae Cogito extends the basic Marxan functionality to better support an iterative and interactive design process. Zonae Cogito introduces the ability to modify and...

(With due deference to United States Founding Father, Thomas Jefferson) When in the course of human events it becomes necessary for one GIS user group to dissolve the licensing agreements which have connected them with a proprietary software vendor and to assume among the free and open source GIS users of the earth, the separate and equal station to which the capabilities of Geospatial Software...