Introduction
For this map, we interpreted a 6-ft-resolution lidar digital elevation model combined with the
geology depicted on the Geologic Map of the Poverty Bay 7.5' Quadrangle, King and Pierce Counties,
Washington (Booth and others, 2004b). The authors of the 2004 map described, interpreted, and located
the geology on the 1:24,000-scale topographic map of the Poverty Bay 7.5' quadrangle.
The topographic map, published in 1997 but compiled in 1957, includes planimetry derived from
1990 imagery and 20-ft contours, nominal horizontal resolution of 40 ft (12 m), and nominal vertical
accuracy of 10 ft (3 m). Similar to many surficial geologic maps, much of the geology in Booth and
others (2004b) was interpreted from landforms portrayed on the topographic map.
In 2003, the Puget Sound Lidar Consortium obtained a lidar-derived digital elevation model
(DEM) for the Puget Sound region including all of the Poverty Bay 7.5' quadrangle. For a brief
description of lidar (LIght Detection And Ranging) and this data acquisition program, see Haugerud and
others (2003). This new DEM has a horizontal resolution and accuracy of 6 ft (2 m) and vertical
accuracy of approximately 1 ft (0.3 m). The greater resolution and accuracy of the lidar DEM have
facilitated a new interpretation of the geology, especially the distribution and relative age of some
surficial deposits.
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First posted November 14, 2014
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