2007 - 2009 OLC Lidar DEM: Hood to Coast, OR

Watershed Sciences, Inc. (WS) collected Light Detection and Ranging (LiDAR) data for the Department of Geology and Mineral Industries (DOGAMI) and the Oregon Department of Forestry (ODF). The Areas of Interest (AOIs) cover portions of eight counties in northwest Oregon. The extent of requested LiDAR area totals ~1,549,015 acres; the extent of the LiDAR area delivered covers ~1,586,385 acres. The dataset encompasses portions of the following counties in northwest Oregon: Tillamook, Columbia, Multnomah, Washington, Marion, Yamhill, Hood River, and Clackamas.

The bare earth digital elevation models (DEM) represent the earth's surface with all vegetation and human-made structures removed. The bare earth DEMs were derived from LiDAR data using TIN processing of the ground point returns. The DEM grid cell size is 3 international feet. The elevation units are in U.S. survey feet. Some elevation values have been interpolated across areas in the ground model where there is no elevation data (e.g. over water, over dense vegetation).

The NOAA Office for Coastal Management (OCM) received 101 ADF DEM files from the Oregon Lidar Consortium. These files were processed to the Data Access Viewer (DAV) and https. In addition to bare earth digital elevation models, the lidar point data are available for download at the link in the Related Items section of this metadata record. Please note that these products have not been reviewed by OCM, and any conclusions drawn from the analysis of this information are not the responsibility of NOAA or OCM.

Provide high resolution terrain elevation and land cover elevation data.

Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners

Data is available online for custom downloads

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Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations.

Microsoft Windows Vista Version 6.1 (Build 7600) ; ESRI ArcCatalog 9.3.1.3500

Qualitative value: , Test that produced the valued: See LiDAR data report.

Qualitative value:RMSE = 0.14 feet, Test that produced the value: The Root Mean Square Error (RMSE) of the data set is 0.14 feet. Accuracy was assessed using 4234 ground survey (real time kinematic) points. Accuracy statistics will be cumulative accross subsequent deliveries, resulting in minor changes in RMSE as well as increasing values for N. Vertical accuracy reported here is for 2008 data only. Please see LiDAR data report for a discussion of statistics related to these datasets.

LiDAR data has been collected and processed for all areas within the project study area.

LiDAR flight lines have been examined to ensure that there was at least 75% sidelap, there are no gaps between flightlines, and overlapping flightlines have consistent elevation values.

Shaded relief images have been visually inspected for data errors such as pits, border artifacts, gaps, and shifting. The data was examined at a 1:3000 scale.