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  "description": "Continental Mapping Consultants, Inc. (CMC) acquired LiDAR data and imagery for the Tualatin National Wildlife Refuge on May 15, 2012.  The project area was expanded to include a 100m buffer around the area of interest to ensure complete coverage.  The dataset encompasses 19.24 square miles in the Tualatin National Wildlife Refuge, Wapato, Oregon. The lidar was collected with a pulse density of 30-60 points per square meter. A Hyrdologically-conditioned, bare-earth digital elevation model (DEM) was created from this point data at 0.5 meter spatial resolution. Continental Mapping used co-mounted imagery and lidar sensors and a helicopter to acquire the data.\n\nHydro break lines that were collected during the ground classification for flowing water greater than 100 feet wide, water bodies larger than 2 acres or 350 feet in diameter, and culvert polygons  were used in conjunction with the bare earth LAS.  Bare earth points that were within 1 foot proximity of a break line or polygon were buffered out of the ground.  Ground inside of the culvert polygons was removed to allow water to flow for hydraulic modeling purposes.  The DEM can then be used to create a representation of the earth's surface and be used for modeling purposes.  A variety of information needed can be obtained through this data set by the use and manipulation of the data by multiple agencies.\n\nOCM received the data files from the Oregon Lidar Consortium. No project or survey report accompanied the data set. The metadata records did not include vertical accuracy information.",
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