In this week's lab, we compared to street network datasets to determine which was more complete (based on the total length of road segments) overall and for each grid square within the study area. One of the datasets contained TIGER road data and the other contained street centerlines maintained by the county. On the basis of overall length, the TIGER data was more complete.
To compare completeness by grid square, I first split the street data along the grid and then merged the resulting smaller feature classes back into one large feature set in order to have a single layer containing all the roads segmented by grid square. I then attached the grid information to each of the road datasets using a Spatial Join, which allowed me to calculate the sum of the road segment lengths for each grid square. That data could then be brought into Excel to calculate the difference in length between the two datasets for each grid square.
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