GIS 5935 LAB 1.2

 

Accuracy statement

 

The project

This project evaluated the accuracy of mapped intersections of roadways in Albuquerque, New Mexico. 20 reference points were chosen from the independent data set, and were tested with two additional datasets, totaling for a collection of 60 data points.

 

The tested data set

The two data sets consist of polyline data of roadways in Albuquerque, New Mexico from StreetMap USA and the city of Albuquerque. The reference points chosen in the independent data set were tested with both StreetMap USA and the city of Albuquerque, for a total of 40 points.

 

The independent data set

Ortoimagery was used to manually identify the center of intersections.



The objectives of this lab were to learn how to determine the quality of road networks, determine positional accuracy of two road networks by comparison and understand the procedures provided by the National Standard for Spatial Data Accuracy. A brief overview of the steps taken to complete this was to first establish a set of 20 reference data points using orthoimagery - these points were manually created by identifying the center of intersections. Once 20 reference points were created, they were followed up by creating test data points in similar intersections with two test datasets from StreetMap and the City of Albuquerque. Careful attention was made to ensure that the attribute ID data from all 3 points was exactly the same. Once the data was created, XY points were added using ArcGIS Pro's tools and the attribute table was exported to Excel to begin analysis. Using the worksheet provided by the Positional Accuracy Handbook, the datasets were examined for differences between the x-y coordinates, and a final accuracy assessment was made.

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