Wednesday, September 27, 2017

Special Topics in GIS Lab 4

This week we are working with networks. In the lab we created a network and practiced adjusting functionality to see how it would display certain routes. The basic network was just a set of edges and junctions (roads and intersections). Then we added a restriction layer that would not allow certain turns onto some streets from others or if there were traffic lights. Finally we used speed limit data to determine the speed a vehicle would travel on each road based on the time of day. This speed limit also varied depending on which direction you were driving on the certain road.
In every step of the lab we performed a route analysis. With the basic network the route it simply plotted the shortest distance to get through all of the stops from beginning to end. Then the route was run with the restrictions turned on which increased the total distance and time of the route. This is due to the fact that some turns were not allowed so it had to calculate a different route. Finally with the traffic information provided the route was calculated with data for 8:00am on a Monday morning and returned that it would take 122 minutes and cover 103 kilometeres which was again an increase from the route run with restrictions.

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