In this week's lab, we had to determine the horizontal positional accuracy of road network according to the NSSDA. 20 random points were selected from the City shapefile and these points had good intersections and straight or close-straight angles. Using these points, the matching 20 points were found on the StreetMap shapefile. Once these points were found, a reference points were placed according to visual sense of where the true location of the points were. The XY Coordinates tool was used to all three point shapefiles so that each of the shapefiles' XY coordinates would be applied to the accuracy statistics chart. The attribute table of the shapefiles were exported as Excel files which I was able to copy and paste each of the X and Y data into the accuracy statistics.
1.
The City Results’ Horizontal Positional
Accuracy: Tested 88.85 feet horizontal accuracy of 95% confidence level.
The StreetMap Results’ Horizontal Positional
Accuracy: Tested 517.6 feet horizontal accuracy at 95% confidence level.
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