Module 2

 

Location of 20 test points

In this lab I used the Positional Accuracy Handbook to find the horizontal accuracy of 2 datasets of streets in Albuquerque: the cities street data and StreetMap USA's data. To complete my analysis I found 20 test points. In finding the right test points I looked out for right angle intersections. I placed a point for each dataset at all 20 locations, then using aerial imagery provided, I placed another point where the intersection should be. I got the latitude and longitude of all points and exported the 3 new tables into .csv tables.

I used the worksheet provided in the Positional Accuracy Handbook to find the RSME and the National Standard for Spatial Data Accuracy.

Formal Accuracy Statements:

Using the National Standard for Spatial Data Accuracy, the street data from the city of 

Albuquerque tested 28.93 meters horizontal accuracy at 95% confidence level

Using the National Standard for Spatial Data Accuracy, the street data from StreetMap USA

tested 206.30 meters horizontal accuracy at 95% confidence level