Cobb streams: official vs lidar (5 ac)

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In the traced area

After hiding lines in lakes and reservoirs, lidar (5-acre cutoff) matches 83% of official stream miles within 20 m (about 65 ft). 55% of lidar miles (about 909 of 1,665) are not on the official map. The traced area is 18 of 26 watersheds, about 54% of the county. Unmasked: 82% match, 59% excess of 1,852 lidar miles.

Layers

Lidar cutoff

Official Cobb streams Lidar 5 ac (near official) Lidar only (not on official map) Lidar 3 ac (test area, near official) Lidar 3 ac only (test area) Gap-closed lines (test area)

Yellow ticks are culvert bridges (≤60 m). Dotted blue lines are filled from Cobb’s official map where lidar missed a stretch.

Bridged gaps (≤60 m) Filled from county map (lidar miss) 3 ac test section (Willeo Creek) Water bodies (lakes, ponds, reservoirs) Show lidar lines in water Official streams outside traced area Federal stream map (NHD) Traced-area boundary Untraced area mask

Fulton County — Lois Place

Lidar lines in the Proctor Creek watershed, compared with the federal stream map. Research preview; estimates, survey required.

Fulton lidar cutoff

Fulton lidar (near federal streams) Fulton lidar only (not on federal map) Fulton gap-closed lines

Yellow ticks are culvert bridges (≤60 m). Dotted lines are filled from the federal stream map where lidar missed a stretch.

Fulton bridged gaps (≤60 m) Filled from federal stream map Federal stream map in Fulton Lois Place survey creek Proctor Creek watershed Fulton County outline Fulton 5 ac, whole county (simplified)

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