Description: <div style="text-align:Left;"><div><div><p style="margin:7 0 14 0;">This layer was created using 2022 NAIP imagery and an oak tree point layer. A buffer around the trees with a width of 70 feet (average for a fully grown Oregon oak). The NDVI within the circle was sampled to see if it was "filled" indicating a mature tree, or not indicating a smaller tree. Meant to be used as a rough proxy for tree size. </p><p style="margin:7 0 14 0;">This layer is an update to the size class layer included in the White_Oak hosted feature class.</p><p style="margin:7 0 14 0;"><span></span></p><p style="margin:0 0 14 0;"><span></span></p></div></div></div>
Copyright Text: NAIP Imagery (2022) from USGS Earth Explorer
Description: The points on this map represent Oregon white oak trees identified in the Portland area via aerial imagery. Each point might represent more than one tree.
Description: White breasted nuthatch are a crucial bird species that relies on Oregon white oak for habitat. Although several well known large patches of oak trees exist throughout the Lake Oswego area, by looking at trees that exist within the neighborhoods, we can see that patches exist among homes as well. The parameters for this layer are trees at 50 meters (164 feet) apart, with at least 100 acres of woodland.<div><br /></div><div>This layer is the same as the layer included in the White_Oak feature layer.</div>
Copyright Text: Oak points source https://www.oregonmetro.gov/news/mapping-one-oak-time
Description: <div style="text-align:Left;"><div><div><p style="margin:7 0 14 0;">According to some previous researchers' findings, squirrels consider oak trees that are within 50 meters (164 feet) to be "connected" or part of the same patch. Using this number, along with a value of 20 acres to differentiate larger patches of trees, patches of potential squirrel habitat emerge from the neighborhoods. </p><p style="margin:7 0 14 0;"><span style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;">This layer is the same as the layer included in the White_Oak feature layer.</span><br /></p><p style="margin:7 0 14 0;"><span></span></p><p style="margin:0 0 14 0;"><span></span></p></div></div></div>
Copyright Text: Oak tree points from this project: https://www.oregonmetro.gov/news/mapping-one-oak-time
Description: <div style="text-align:Left;"><div><div><p style="margin:7 0 14 0;">Several habitat patch layers were created for this map by buffering oak tree points and dissolving, and then extracting by a minimum size. In this case, trees were at least 50 feet apart (using a 25 ft buffer) and patches must contain at least 8 trees worth.<br /></p><p style="margin:7 0 14 0;"><span></span></p><p style="margin:0 0 14 0;"><span></span></p></div></div></div>
Copyright Text: Oak tree points from this project: https://www.oregonmetro.gov/news/mapping-one-oak-time
Description: Tax lots were first extracted for single and multi family home zoning. They were then merged with the overlying oak trees to allow lots with oak trees to be differentiated and sorted by number of trees.<div><br /></div><div><span style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;">This layer is an update to the Taxlot layer included in the White_Oak hosted feature class.</span><br /></div>
Copyright Text: Oak tree points from this project: https://www.oregonmetro.gov/news/mapping-one-oak-time
Tax lots acquired from Portland Metro RLIS Discovery 2022
Description: A suitability analysis combined with a blindspot analysis to isolate possible zones that could be missing from the white oak points layer originally used in the project. The blindspots were created using a 200-foot buffer around existing (included) trees.<div><br /></div><div><span style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;">This layer is the same as the layer included in the White_Oak feature layer.</span><br /></div>
Copyright Text: Oak tree points from this project: https://www.oregonmetro.gov/news/mapping-one-oak-time
Description: For this suitability analysis, two major factors were determined to be of importance: soil characteristics and slope. <div><br /></div><div>Slopes of under 30% were most desirable. A 30-meter DEM was obtained from USGS Earth Explorer.</div><div><br /></div><div>Soil characteristics favorable to oak trees are complex. A soil data layer was obtained from the US Department of Agriculture and filtered for desirable moisture and texture combinations, and then intersected with the areas of appropriate slope.</div><div><br /></div><div><span style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;">This layer is the same as the layer included in the White_Oak feature layer.</span><br /></div>
Copyright Text: DEM Layer: SRTM 1-arc second DEM from USGS
Soil layer: gNATSGO from USDA