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Our iUSA tool is now available for download.

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Spatial Accuracy 2014 at MSU (July 2014).

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Arika Ligmann-Zielinska Department of Geography 673 Auditorium Rd, rm 121 Michigan State University East Lansing, 48824-1117

ligmannz (at)

The only thing that makes life possible is permanent, intolerable uncertainty; not knowing what comes next. Ursula K. Le Guin


The study of how uncertainty in the output of a model (numerical or otherwise) can be apportioned to different sources of uncertainty in the model input.

Source: Global Sensitivity Analysis The Primer, Saltelli et al. 2008, Wiley


A method of model evaluation in which outcome uncertainties and factor sensitivites are computed and mapped for every spatial entitiy (and for every time step) within the area of interest.

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Sources: Applying time-dependent variance-based global sensitivity analysis to represent the dynamics of an agent-based model of land use change, Ligmann-Zielinska and Sun, 2010, IJGIS, 24(12), 1829-50; Spatially-explicit sensitivity analysis of an agent-based model of land use change, Ligmann-Zielinska, 2013, IJGIS, 27(9), 1764-81

Funded by NSF Financial support for this work was provided by the National Science Foundation Geography and Spatial Sciences Program Grant No. BCS 1263477. Any opinion, findings, conclusions, and recommendations expressed in this material are those of the authors(s) and do not necessarily reflect the views of the National Science Foundation.