lab 9 (1)

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University of New Hampshire *

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658

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Geography

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Apr 3, 2024

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docx

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NR 658 Introduction to GIS Lab Section 6 Lab #9: Spatial Analysis Chapter Summary: Chapter 9 teaches us the idea of dealing with issues involving geographic locations. Specifically proximity analysis and suitability, two tools which serve as prototypes for more complex spatial analyses. The chapter begins with a focus on using buffer analysis to better understand the attributes of a location, which allows us to create a specific. This specific spatial analysis technique was used in assignment 9-1 to analyze buffers around major earthquakes in California (Figure 1). The sections in the chapter covering spatially joining data was useful because the buffers created in assignment 9-1 needed to be joined to develop a more comprehensive understanding of the relationship between earthquakes and cities in California. Buffer analysis and spatially joining those analyses enables users to aggregate point data summaries of polygons, this is a very important tool in creating GIS systems. Techniques learned: ● Buffer points and polygons (9-1) ● Analyze the suitability of locations (9-2) ● Create multiple ring buffers (9-3) ● Spatially joining of buffers (9-3) Real World Applications: The real world applications of chapter 9 are very real for conservation science. For example, I could download a map of major roads in NH and create a buffer around them to show potential areas high with chemical runoff from construction, cars, or salt runoff. From here I would be able to display areas of potential high pollution and create a map showing possible areas like wetlands or forests in these buffers in need of intervention / conservation. Difficulty Encountered and Solutions: The biggest difficulty I encountered in Chapter 9 came in the chapter when I had to summarize cities within the 10 mile radius of
earthquakes. I solved this by spatially joining the new buffer layer with cities (figure 2), and was then able to select by location, highlighting the 62 cities inside the buffers. Assignment 9-1: In this assignment I was tasked with creating a map of California displaying a 10 mile radius around earthquakes from the 80s-90s (figure 1). From there, 62 cities were selected that were within these buffers. Figure 1: Map of California and Earthquakes with 10 Mile Buffer Figure 2: Attribute Table Showing Spatial Join
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