Priority Planting Areas: Automating the Selection of Planting Sites
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Transcript of Priority Planting Areas: Automating the Selection of Planting Sites
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Priority Planting AreasAutomating the Selection of Planting Sites
Partners in Community ForestryNolan RundquistNovember 18, 2015
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Our mission, vision, and core values
Committed to 5 core values to create a city that is:SafeInterconnectedAffordableVibrantInnovative
For all
Mission: deliver a high-quality transportation system for Seattle
Vision: connected people, places, and products
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Project GoalsRank areas of the city according to potential social, environmental and economic value of trees in locations that best support canopy
cover, social equity and transportation safety.Display most current information on current
stocking levelsIdentify areas where low stocking levels,
available planting sites and high potential benefits intersect.
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Tree Benefits MapAreas within environmentally critical areasAreas along proposed neighborhood greenwaysAreas that can accommodate large treesAreas within Urban VillagesAreas with low canopy coverAreas near high-need or underserved populations
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Processing the MapCreate a GIS grid feature class of 150x150 foot squares. Any square that does not intersect right of way is eliminatedDevelop a weighted scoring systemAssign scores to a grid square when it intersects an attribute layerCalculate a total score for each square
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Tree Benefits Map
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Attribute Distribution
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Street Tree Spacing Map
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Visual representation of stocking levelsOutputs streets by color code to display…Fully planted (average tree spacing <30 feet)Planted (average tree spacind of 31 – 60 feet)Underplanted (average tree spacing of 61 – 180 feet)Very few or no trees (average tree spacing >180 feet)
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Darker colors indicate areas of greater tree spacing.
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Priority Streets Mapping
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Tree Benefits map and Tree Spacing map combine to produce a Priority Streets map.Areas with high scores are selected from the benefits map – a layer is created with this data.Combined with areas from the spacing map which have low stocking levels – a layer is created with this dataUse the “select by location” tool, select the features that intersect in the new layers.
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Priority Streets Mapping
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Areas identified that would most benefit from street tree restoration projectsTree spacing greater than 60 feet and a high benefit score
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Analysis of past projects
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Other Challenges
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Narrow planting stripsViewsCommunity SupportUtility and Infrastructure DensityTree Maintenance responsibility (public or private)
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Street Tree Map