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Laurel Ridge Zone Change (Z 15-5) why approval of the zone change was recommended in the first place. That said, staff now confirms that the applicant's methodology could be substantially improved with the use of additional physical referents surrounding the extent of the subject property. But, what about the 2-degree rotation issue? When one attempts to align a more precise line (surveyed 30th Avenue) with a less precise line (30th Avenue on the Metro Plan diagram), there will be some degree of rotation, tilt, or misalignment. When the applicant completed their overlay, using 30th Avenue as the referent, it just turned out that the subject tax lots did not show a 2-degree "tilt" that exists when any feature is registered to the Oregon State Plane Coordinate System. In other words, the applicant apparently did not address the fact that their surveyed tax lots were registered to a different coordinate system than that of the adopted Metro Plan Diagram. The question was also raised regarding the alignment of 30th Avenue, and how it becomes less and less accurate on the applicant's map as you move further from the subject site. During their presentation, the applicant stated that they focused on the alignment of 30th Avenue in the area closest to the subject site. This strategy might work for some applications, but trying to accurately align such a large property (approx. 120 acres) would greatly benefit from the use of multiple referents, or "control points" surrounding the extent of the subject property. If the applicant had used additional referents, the overall accuracy of their map would likely have been increased. The Opponent's Map Staff believes the opponents are correct in stating that the LCOG-generated map is more precise. But how was the "LCOG map" created? LCOG maintains a digital version of the Metro Plan diagram in their GIS database (technically called a "GIS layer"). At some point, GIS professionals aligned this digital Metro Plan GIS layer with a digital tax lot layer that is maintained in the same database. This "overlay" encompasses the entire City; in other words, you can open this overlay in ArcGIS software and "zoom in" to any part of the City to see where different plan designations exist in comparison to tax lot. Staff believes the map presented by opponents was simply created by zooming in to the subject property and taking a snapshot of this overlay. There are, however, two fundamental problems with this map produced by LCOG (and presented as the "correct" map by opponents), in the context of this zone change application. First, and most importantly, the digital GIS layer version of the Metro Plan diagram is not the adopted, official diagram. As we know, the only official version of the diagram is the printed, 2004 Metro Plan diagram in 11"x17" format. Even if the digital GIS version is more precise, it cannot be used here as the basis for determining the line between LDR and POS plan designations. The second issue with the opponent's map relates to the methodology of how it was created and possibly revised over time. It may be reasonable to assume that rigorous methodologies were used, as the map was created by trained professionals without interest or bias in how the configurations turned out relative to any particular parcel. Furthermore, staff believes that this map is likely the most accurate representation of the City's tax lots being overlaid on the Metro Plan diagram. That said, City staff maintains no documentation regarding the methodology employed by LCOG staff; lacking an explanation of the exact methodology presents a problem City of Eugene • 99 W. 10th Ave. • Eugene, OR 97401 • 541-682-5481 • 541-682-5572 Fax www.eugene-or.gov/planning Laurel Ridge Record (Z 15-5) Page 90