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Description: Priority Conservation Areas are designated to accelerate protection of key natural lands in the San Francisco Bay Region through purchase or conservation easements. While initially adopted as part of the Association of Bay Area Governments' FOCUS Program, Priority Conservation Areas have become part of Plan Bay Area, the regional plan that grew out of the California Sustainable Communities and Climate Protection Act of 2008 (CA SB 375, Steinberg). Priority Conservation Areas were nominated by local jurisdictions and non-profit conservation groups as areas of importance for conservation to retain and enhance the natural environment that is key to the quality of life enjoyed by the region's residents and visitors and the region's ecological diversity.Through the Priority Conservation Areas, conservation will be promoted by:Coordinating conservation efforts within a regional framework of near-term prioritiesProviding a strong platform on which to leverage public and private resourcesBuilding upon prior and existing land protection efforts and investmentsProviding opportunities for forging new partnershipsWhen available, shapefiles forwarded by PCA leads were directly incorporated into this feature set. If a shapefile was not available, map images submitted by the PCA lead were georeferenced and the boundary digitized for use in this feature set.
Copyright Text: Association of Bay Area Governments, 2015
Description: The full datasheet for this product is available here: https://sonomaopenspace.egnyte.com/dl/qOm3JEb3tDClass definitions, as well as a dichotomous key for the map classes, can be found in the Sonoma Vegetation and Habitat Map Key (https://sonomaopenspace.egnyte.com/dl/xObbaG6lF8). The fine scale vegetation and habitat map was created using semi-automated methods that include field work, computer-based machine learning, and manual aerial photo interpretation. The vegetation and habitat map was developed by first creating a lifeform map, an 18-class map that served as a foundation for the fine-scale map. The lifeform map was created using “expert systems” rulesets in Trimble Ecognition. These rulesets combine automated image segmentation (stand delineation) with object based image classification techniques. In contrast with machine learning approaches, expert systems rulesets are developed heuristically based on the knowledge of experienced image analysts. Key data sets used in the expert systems rulesets for lifeform included: orthophotography (’11 and ’13), the LiDAR derived Canopy Height Model (CHM), and other LiDAR derived landscape metrics. After it was produced using Ecognition, the preliminary lifeform map product was manually edited by photo interpreters. Manual editing corrected errors where the automated methods produced incorrect results. Edits were made to correct two types of errors: 1) unsatisfactory polygon (stand) delineations and 2) incorrect polygon labels.The mapping team used the lifeform map as the foundation for the finer scale and more floristically detailed Fine Scale Vegetation and Habitat map. For example, a single polygon mapped in the lifeform map as forest might be divided into four polygons in the in the fine scale map including redwood forest, Douglas-fir forest, Oregon white oak forest, and bay forest. The fine scale vegetation and habitat map was developed using a semi-automated approach. The approach combines Ecognition segmentation, extensive field data collection, machine learning, manual editing, and expert review. Ecognition segmentation results in a refinement of the lifeform polygons. Field data collection results in a large number of training polygons labeled with their field-validated map class. Machine learning relies on the field collected data as training data and a stack of GIS datasets as predictor variables. The resulting model is used to create automated fine-scale labels countywide. Machine learning algorithms for this project included both Random Forests and Support Vector Machines (SVMs). Machine learning is followed by extensive manual editing, which is used to 1) edit segment (polygon) labels when they are incorrect and 2) edit segment (polygon) shape when necessary.The map classes in the fine scale vegetation and habitat map generally correspond to the alliance level of the National Vegetation Classification, but some map classes - especially riparian vegetation and herbaceous types - correspond to higher levels of the hierarchy (such as group or macrogroup).
Copyright Text: Sonoma County Water Agency, Sonoma County Agricultural Preservation and Open Space District, Sonoma County Vegetation Mapping and LiDAR Program
Value: Southwestern North American Riparian Evergreen and Deciduous Label: Southwestern North American Riparian Evergreen and Deciduous Description: N/A Symbol:
Value: Western North American Freshwater Aquatic Vegetation Macrogroup Label: Western North American Freshwater Aquatic Vegetation Macrogroup Description: N/A Symbol: