2013 - 2015 OLC Lidar: Lane County, OR

Date range of collection for Lane County

Create custom data files by choosing data area, product type, map projection, file format, datum, etc. A new metadata will be produced to reflect your request using this record as a base

Bulk download of data files in LAZ format, geographic coordinates, orthometric heights. NOte that the vertical datum (hence elevations) of the files here are different that described in this document.

The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U.S. and its territories. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. An email provides a link to the customized data, while the original data set is available through a link within the viewer.

This graphic displays the footprint of this Lidar data set.

This link directs you to the project reports for this data, which was delivered in 10 installments.

The OLC Lane County Delivery 10 LiDAR survey utilized the Leica ALS80 sensor mounted in a Cessna Caravan 208. The system was programmed to emit single pulses at a rate of 350 kilohertz and flown at 1,500 meters above ground level (AGL), capturing a scan angle of +/-15 degrees from nadir (field of view equal to 30 degrees). These settings are developed to yield points with an average native density of greater than eight pulses per square meter over terrestrial surfaces.

The native pulse density is the number of pulses emitted by the LiDAR system. Some types of surfaces such as dense vegetation or water may return fewer pulses than the laser originally emitted. Therefore, the delivered density can be less than the native density and lightly vary according to distributions of terrain, land cover, and water bodies. The study area was surveyed with opposing flight line side-lap of greater than 65 percent with at least 100 percent overlap to reduce laser shadowing and increase surface laser painting. The system allows up to four range measurements per pulse, and all discernible laser returns were processed for the output dataset.

To solve for laser point position, it is vital to have an accurate description of aircraft position and attitude. Aircraft position is described as x, y, and z and measured twice per second (two hertz) by an onboard differential GPS unit. Aircraft attitude is measured 200 times per second (200 hertz) as pitch, roll, and yaw (heading) from an onboard inertial measurement unit (IMU). As illustrated in the accompanying map, 1,460 full and partial flightlines provide coverage of the study area.

The NOAA Office for Coastal Management (OCM) received 6747 laz files from DOGAMI. The lidar data had elevation and intensity measurements. The data were in Oregon Lambert projection (NAD83 2011) coordinates (Int Feet) and NAVD88 (Geoid12A) elevations in international feet. The data were classified as: 1-Unclassified, 2-Ground. OCM processed all classifications of points to the Digital Coast Data Access Viewer (DAV). Classes available on the DAV are: 1 & 2.

OCM performed the following processing on the data for Digital Coast storage and provisioning purposes:

1. An internal OCM script was run to check the number of points by classification and by flight ID and the gps and intensity ranges.

2. Internal OCM scripts were run on the laz files to convert from orthometric (NAVD88) elevations to ellipsoid elevations using the Geoid 12A model, to convert from Orgeon Lambert (NAD83 2011) coordinates in international feet to geographic coordinates, to convert vertical units from international feet to meters, to assign the geokeys, to sort the data by gps time and zip the data to database and to http.