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Kevin Byrne’s Study: ESRI Extension Research, 2009
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Kevin Byrne’s Study: ESRI Extension Research, 2009

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  • 1. Extension Research Presentation for Week 2 of Saint Mary U’s Advanced Spatial Modeling ______________________________ Kevin Byrne September 14, 2009  
  • 2. Goal To provide an overview of a chosen extension by a demo/discussion using a mix of resources.  
  • 3. Background • Title is An ArcGIS Extension for Generating and Updating Ordinary and Multiplicatively Weighted Voronoi Diagrams for Points, Lines, and Polygons and author is Pinliang Dong • Uses ArcObjects written in Visual Basic • It is raster-based and was posted to ESRI’s website on April 4, 2009. ESRI’s download record shows 1410 so far.  
  • 4. Background (cont’d) • Voronoi diagrams are tessellations that define regions “such that each contains all locations closer to the generating object than to any other object in the pattern.” • Fall under a large umbrella known as exploratory spatial data analysis (ESDA). • A first – and dramatic – usage was by Dr. John Snow in order to map cholera outbreaks in London in the mid 19th c.  
  • 5. Background (cont’d) Dong’s extension has the following features: • Works for point, line, and polygon features; • Generates both ordinary and multiplicatively weighted Voronoi diagrams in vector format; • Assigns non-spatial attributes of input features to cells through spatial joining; and… • Produces ordinary or weighted Euclidean distance raster datasets for modeling apps.  
  • 6. My Methodology-Steps 1. I searched ESRI’ site with the key word voronoi and found one script. The extension to which it linked was downloaded from the site; its size was 3832 k. 2. It needed to be unzipped and installed with a setup.exe routine. I then turned it on as an extension in ArcMap and docked it. 3. The install folder included a) sample data assets, and b) an html tutorial doc. that I used to acquaint myself with its capabilities. 4. I completed the first of three phases of Mr. Dong’s tutorial using his data 5. The final (third) phase of the tutorial was the most interesting; it demanded a deep dive into an attribute table of Dong’s .mxd file in order to explore a target attribute column of one’ choosing. I tried this out as it is a centerpiece to the extension’s strength; results were successful. 6. I saved the completed tutorial’s .mxd file, did screen snaps throughout the procedure, turned on appropriate layers, and exported one Voronoi map to PDF. 7. Lastly I assembled screen snaps, final map, and descriptive textmatter into this final report.  
  • 7. Discoveries • Download and installation was seamless. • Tutorial was essential. • I hope to try this with my own data but I need more theoretic background. • Its blend of vector and raster output permitted me to explore overlapping two layers with varied transparency. These hybrid displays were visually engaging and informative.    
  • 8. Voronoi Map With Owner-Occupied Count 3927 3863 9666 5171 10607 10607 3863 6871 8016 7007 8016 7550 Data Source: P. Dong Extension Research, Analysis and Design: K. Byrne Date: September 14, 2009 Course: Advanced Modeling, Saint Mary's U.
  • 9. References • Dong, P., 2008. Generating and updating multiplicatively weighted Voronoi diagrams for point, line and polygon features in GIS… • Johnson, S., 2006. The Ghost Map: The Story of London's Most Terrifying Epidemic… • O’Sullivan, D. and D. Unwin, 2003. Geographic Information Analysis…