Topography - 2ft interval 2002-2004 (Tacoma)

Two foot contours around the City of Tacoma were generated from LiDAR data gathered by the Puget Sound Lidar Consortium, a division of the Puget Sound Regional Council. LiDAR data was collected early 2002 for western Pierce County and winter 2004 for central Pierce County at a rate of 1 pulse per square meter, up to 4 pulses. Over 90% of road elevations in the source data were within +/- 1 foot when compared to 1990 elevation data. Derived elevation values are calculated using the North American Vertical Datum of 1988 (feet). More current contour data is available through the Pierce County Open Data Portal: Contour Index.塔科马市周边的等高距为2英尺的等高线，由普吉特湾区域委员会下属机构普吉特湾激光雷达联盟（Puget Sound Lidar Consortium）采集的激光雷达（LiDAR）数据生成。该激光雷达数据的采集工作分两阶段完成：皮尔斯县西部的数据采集于2002年初开展，皮尔斯县中部的数据采集于2004年冬季开展，采集速率为每平方米1个脉冲，最高可达4个脉冲。将源数据中的道路高程与1990年的高程基准数据对比后发现，超过90%的道路高程误差处于±1英尺范围内。导出的高程值基于1988北美垂直基准面（英尺单位）进行计算。可通过皮尔斯县开放数据门户（Pierce County Open Data Portal）获取最新的等高线数据：等高线索引（Contour Index）。