The datasets compiled for this update were mapped and illustrated using river rulers (See the Appendix Volume II: Technical Backup Document). The rulers illustrate complex information about communities, flood infrastructure, dry and wet weather flows, recreation, parks and open space, arts and culture, wildlife, ecological communities, water quality, and geophysical characteristics and relate the data to the river mile and the left or right bank of the river. This representation facilitates the comparison of data across categories. The rulers are incredibly useful for representing complex, dense information and comparing data across communities with varied cultural and demographic fabrics along the river. When several rulers are aligned, a rich cross-section of data emerges, allowing comparison of factors that might not have previously been considered side by side and revealing physical patterns and thematic connections. This allows for cross-disciplinary communication between the typically engineering-based aspects of the river and the rich cultural and social fabrics, histories, and ecologies of the river (see Appendix II, Technical Backup Document for the full river ruler atlas compiling rulers from all of the LA River Master Plan analysis datasets).