addressing climate change adaptation in regional transportation plans

Addressing Climate Change Adaptation in Regional Transportation PlansA Guide for California MPOs and RTPAsIt is anticipated that, while an asset geodatabase populated with state and federaldata would be useful to regional assessment, MPOs and RTPAs will want toenhance this information by adding regionally and locally specific layers. Thiscan be accomplished in several ways, including the construction of a separate,free standing geodatabase or “nesting” of regional layers into the statewidedatabase. Figure 9.4 shows an example of this “nesting” method for bridgelayers from the National Bridge Inventory (NBI) as well as local bridge data.This approach is preferred, because it allows for the direct integration ofcomplementary layers – including the use of existing feature classes (e.g.,Roadways or Bridges). Advanced users with access to on-line mapping licenses(e.g., ESRI FlexViewer), can consider converting the final geodatabase product inorder to display and disseminate the data on-line to a select group of subregionalstakeholders or the public at large.Figure 9.4Abbreviated Approach to Nesting Data for a VulnerabilityAssessment, Example for BridgesState/Federal Data on Left, Regional/Local Data on Right)LocationState RoadwayNetwork + NBIStructureIdentifierSpatialExtentNBI DecklengthNBI MinimumOverclearanceLocal Bridge DataConditionScour CriticalLocal Bridge DataSource: Cambridge Systematics, Inc., 2012.The regional layers should be assembled and organized into feature datasets byasset category. These categories relate to a broad transportation mode orinfrastructure type. Within each feature dataset are one or more feature classes,representing independent systems or assets that are thematically similar (or, as isoften the case, overlapping datasets from multiple sources).Cambridge Systematics, Inc. 9-11