Public Comment (2) - Laserfiche WebLink

Mr. Erik Berg-Johansen August 14, 2015 Page 7 On the other hand LCOG, in using the entire Metro Plan Diagram for alignment with the tax lot layer has numerous options for referents. One that is readily apparent is the Downtown street grid. In that area, right-of-way widths are 66 feet (Lane Co. Map 17033141, next page), which provide much tighter constraints on the street locations on the Metro Plan Diagram than the 300+' R-o-W of 30t" Avenue. In order to determine the magnitude of "slop" imparted by the use of Downtown Streets such as 7t" 8th 11th, Willamette, Oak, High, Patterson etc. as a referents, we enlarged the 11 x 17 copy of the adopted Metro Plan Diagram supplied by the applicant as their Exhibit C until the black lines of the streets obtained measurable width. In the downtown area, the width is constant at 0.006 inches. Given the 1" = 7,000' scale on the diagram (which was verified), this means that the black lines on the Metro Plan Diagram represent 0.006 x 7,000 = 42 feet. As a result, the potential variability of the relationship between the tax lot layer and the Metro Plan Diagram imparted by use of the Downtown Street Grid is 66 feet (width of R-o-W on TL map) minus 42 feet (width of streets on Metro Plan Diagram) or 24 feet! Therefore, it appears that even without use of numerous other potential referents, LCOG's alignment of the entire Metro Plan diagram with the tax lot map and State Plane Coordinate System should be accurate to within 24 feet both N-S and E-W. The 179-foot offset of the applicant's version of the overlay represents more than 7 times the amount of variability expected from the use of better and more referents not necessarily present within the snippet of the Metro Plan Diagram utilized by Schirmer-Satre. Therefore, given that the LCOG version of the overlay has an expected variance of 24 feet, the Schirmer-Satre version varying by 179 feet from the LCOG version does not fall within acceptable limits of variance and is "incorrect".