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POHelp plotting Geographic Data in R using PBSMapping and Shapefiles
 

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  1. POHelp plotting Geographic Data in R using PBSMapping and Shapefiles
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    <p>Using <a href="http://oreilly.com/catalog/9780596804770/" rel="noreferrer">O'Reilly's Data Mashups in R</a> as inspiration, I'm trying to plot a handful of addresses on a shapefile of Salt Lake County, Utah found <a href="http://gis.utah.gov/sgid-vector-download/utah-sgid-vector-gis-data-layer-download-index?fc=CensusTracts2000" rel="noreferrer">here</a>.</p> <p>I have data frame geoTable:</p> <pre><code>&gt; geoTable address Y X EID 1 130 E 300 S 40.76271 -111.8872 1 2 875 E 900 S 40.74992 -111.8660 2 3 2200 S 700 E 40.72298 -111.8714 3 4 702 E 100 S 40.76705 -111.8707 4 5 177 East 200 S 40.76518 -111.8859 5 6 702 3rd ave 40.77264 -111.8683 6 7 2175 S 900 E 40.72372 -111.8652 7 8 803 E 2100 S 40.72556 -111.8680 8 </code></pre> <p>And I've coerced it into an eventData object:</p> <pre><code>&gt; addressEvents&lt;-as.EventData(geoTable,projection=NA) &gt; addressEvents address Y X EID 1 130 E 300 S 40.76271 -111.8872 1 2 875 E 900 S 40.74992 -111.8660 2 3 2200 S 700 E 40.72298 -111.8714 3 4 702 E 100 S 40.76705 -111.8707 4 5 177 East 200 S 40.76518 -111.8859 5 6 702 3rd ave 40.77264 -111.8683 6 7 2175 S 900 E 40.72372 -111.8652 7 8 803 E 2100 S 40.72556 -111.8680 8 </code></pre> <p>So it looks like I've got everything I need to plot-but its not working. When I load the shapefile and plot using</p> <pre><code>addPoints(addressEvents,col="red",cex=.5) </code></pre> <p>I'm left looking at an empty shapefile. Additionally, when I try and run findPolys against my eventData object, it returns NULL.</p> <pre><code>&gt; findPolys(addressEvents,myShapeFile) NULL </code></pre> <p>How can I make this work? I was able to complete the O'Reilly tutorial without any problems and am having difficulty figuring out where I'm going wrong here. I dont know if its the shapefile, my data frame, or whateverelse. </p> <p>Here are the commands I use to import my data and shapefile</p> <pre><code>slc&lt;-read.table('~/utah.txt',sep=',',header=TRUE,strip.white=TRUE,stringsAsFactors=FALSE) myShapeFile&lt;-importShapefile("/Users/neil/Downloads/SGID93_DEMOGRAPHIC_CensusTracts2000/SGID93_DEMOGRAPHIC_CensusTracts2000",readDBF=TRUE) </code></pre>
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    1. COMy gut tells me that its not my data, rather its my shapefile. I'm really new to the concept of shapefiles. When I plotPolys using O'Reilly's example shapefile, the X and Y axes look like long and lat. When I plotPolys using the Utah shapefiles, the X and Y axes look like a different numbering system.
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    2. COI had never used the PBSmapping package. I have messed slightly with maptools.
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