O) are intrinsic properties of biological and geological materials, and can be used to constrain the geographic origin and movements of such materials. One of the most widespread uses of such data in ecology is to reconstruct geographic movements of animals by comparing isotope ratios of chemically inert tissues to predictive models ('isoscapes') of spatial isotopic variation in environmental water. 2. Although data analysis for isotope-based geographic assignment is the subject of ongoing research, a basic framework for this work has emerged. 3. Here, we introduce and document a set of data analysis tools, implemented within the IsoMAP (Isoscapes Modelling, Analysis, and Prediction; http://isomap.org) cyber-GIS system, that support basic analysis of sample data for geographic assignment applications. We highlight important considerations and potential pitfalls associated with use or misuse of the tools. 4. In addition to increasing the accessibility of geographic assignment analysis, IsoMAP provides several unique capabilities related to the generation of space-and time-specific water isoscapes that may advance the field of isotope-based assignment. Functionality of the existing toolkit is limited in scope, and although the system will be actively developed in the future, it is intended to complement and not supplant more flexible and customizable analytical tools.
The objective of this paper is to present the development and implementation of a prototype cyberinfrastructure, called SWATShare, for sharing, running and visualizing Soil and Water Assessment Tool (SWAT). SWATShare is developed as a collaborative environment for hydrology research and education using the models published and shared in the system.SWATShare also provides capabilities for model discovery, downloading, running and visualization of model simulations. Some of the functions in SWATShare are supported by providing access to high performance computing resources including the XSEDE and cloud.SWATShare can also be used as an educational tool within a classroom setting for comparing the hydrologic processes under different geographic and climatic settings. The utility of SWATShare for collaborative research and education is demonstrated by using three case studies. Even though this paper focuses on the SWAT model, the system's architecture can be replicated for other models for collaborative research and education.
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