Special Topics Assessment Lab 3

This lab focused on assessing the quality of road networks and determining the completeness of them. Two road networks data sets were given Tiger Roads and Street Centerlines, as well as a county line. Figure 1 shows both road networks within the county line.

Figure 1

A grid network containing 1kmx1km polygons were also given. Figure two shows the two road networks in relation to the grid network.

Figure 2

The total length of both road networks were found Street Centerlines being 10,805.8km and Tiger Roads being 11,382.7km. The next step was to determine the total length of both road networks within each grid. When needing to determine the total length of roads within each grid, my first thought was using an intersect tool. After some research the pairwise intersect tool seemed to be the best option for the outcome I was looking for. Using the pairwise intersect tool I was able to join each road network data set to the grid feature. This tool eliminated the road lines that were out of the grid, as well as separated lines that crossed grid borders. The calculate geometry tool was then used to recalculate the sum of each data set. The completeness of each grid was found with Street Centerlines being more complete in 134 grids and Tiger Roads being more complete in 162 grids. One grid did not contain either road network. The percent difference completeness of the road networks within each grid was then found and a choropleth map was made showing the percent differences (Figure 3).


Figure 3

 

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