Thomas Butkiewicz

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A perennially interesting research topic in the field of visual analytics is how to effectively develop systems that support organizational users' decision-making and reasoning processes. The problem is, however, most domain analytical practices generally vary from organization to organization. This leads to diverse designs of visual analytics systems in(More)
Most of the algorithms used for research in mesh simplification and discrete levels of detail (LOD) work well for simplifying single objects with a large number of polygons. For a city-sized collection of simple buildings, using these traditional algorithms could mean the disappearance of an entire residential area in which the buildings tend to be smaller(More)
Traditional geospatial information visualizations often present views that restrict the user to a single perspective. When zoomed out, local trends and anomalies become suppressed and lost; when zoomed in for local inspection, spatial awareness and comparison between regions become limited. In our model, coordinated visualizations are integrated within(More)
Figure 1: Left to right: (a) Original models (285,039 polygons); (b) Simplified models using our algorithm (131,409 polygons); (c) Models from (b) that have been simplified are shown in yellow; (d) Here we show view-dependent simplification of (b) from a top-down view. Notice that simplified models closer to the eye point have more detailed geometry, while(More)
Many previous approaches to detecting urban change from LIDAR point clouds interpolate the points into rasters, perform pixel-based image processing to detect changes, and produce 2D images as output. We present a method of LIDAR change detection that maintains accuracy by only using the raw, irregularly spaced LIDAR points, and extracts relevant changes as(More)
We present a probe-based interface for the exploration of the results of a geospatial simulation of urban growth. Because our interface allows the user great freedom in how they choose to define regions-of-interest to examine and compare, the classic geospatial analytic issue known as the modifiable areal unit problem (MAUP) quickly arises. The user may(More)
Since its inception, the field of visual analytics has undergone tremendous growth in understanding how to create interactive visual tools to solve analytical problems. However, with few exceptions , most of these tools have been designed for single users in desktop environments. While often effective on their own, most single-user systems do not reflect(More)
In this paper, we describe our current work in developing a computer-based educational tool for Occupational Therapy students learning client evaluation techniques. The software is dialog-based and allows the student to interact with a virtual client. Students carry out an evaluation, following the appropriate procedures and assessing both the client's(More)
Most terrain models are created based on a sampling of real-world terrain, and are represented using linearly-interpolated surfaces such as triangulated irregular networks or digital elevation models. The existing methods for the creation of such models and representations of real-world terrain lack a crucial analytical consideration of factors such as the(More)