Pilot LIDAR Mapping Project - Portland, Oregon, Metropolitan Area

Citation:

Citation Information:

Title: Pilot LIDAR Mapping Project - Portland, Oregon, Metropolitan Area

Description:

Abstract:
LIDAR (Light Detection And Ranging) is a remote sensing method of obtaining extremely detailed surface terrain data. A laser emits and receives thousands of laser pulses per second for the purpose of calculating the distance to an object. The LIDAR system (mounted to a fixed wing aircraft) consists of three main components: 1) a scanning laser rangefinder 2) a differential Global Positioning System (GPS), and 3) an Inertial Navigation System (INS). Surface elevations are derived by recording the two-way travel time of the laser pulse in combination with positioning and orientation information obtained from the onboard GPS and INS, and GPS base stations on the ground surface. A website developed by the Oregon Department of Geology & Mineral Industries, in coordination with Portland State University, Department of Geology presents 441 square miles of LIDAR data for the Portland Metropolitan area. The intent of this web site is to allow users to view and compare a LIDAR-derived shaded relief image with orthophotos, topographic map images, and 10-meter Digital Elevation Model shaded relief.
Purpose:
The purposes of this project are: to make images of the Bare Earth digital elevation model (DEM) derived from LIDAR data available and searchable on the web by street address; and to allow users to compare and contrast LIDAR against aerial photographs, topographic maps, and 10-meter DEM shaded relief. The ultimate goal is to educate Oregonians as to the practical and superior utility of this form of elevation information. Where earthquake and landslide hazard data are available, these hazard layers may be turned on and off.
Supplemental Information: The raw XYZ ASCII data for this LIDAR web site presentation was obtained from the Puget Sound LIDAR Consortium (PSLC). The PSLC web site is: http://pugetsoundlidar.ess.washington.edu/

Time Period of Content:

Time Period Information:

Range of Dates/Times:

Beginning Date: 3/7/2004
Ending Date: 3/13/2004

Status:

Progress: Complete
Maintenance and Update Frequency: Annually

Spatial Domain:

Bounding Coordinates:

West Bounding Coordinate: -122.95
East Bounding Coordinate: -121.9
North Bounding Coordinate: 45.9
South Bounding Coordinate: 45.22

Keywords:

Theme:

Theme Keyword Thesaurus: None
Theme Keyword: Terrain modeling
Theme Keyword: LIDAR (Light Detection And Ranging)
Theme Keyword: Digital Elevation Model
Theme Keyword: bare earth
Theme Keyword: Shaded relief image

Place:

Place Keyword Thesaurus: None
Place Keyword: Oregon
Place Keyword: Portland Metropolitan area
Place Keyword: Multnomah County
Place Keyword: Washington County
Place Keyword: Clackamas County

Access Constraints: None
Use Constraints: None
Point of Contact:

Contact Information:

Contact Person Primary:

Contact Person: Ian P. Madin
Contact Organization: Oregon Department of Geology and Mineral Industries

Contact Position: Chief Scientist
Contact Voice Telephone: 971 673-1542
Contact Facsimile Telephone: 971 673-1562
Contact Electronic Mail Address: Ian.P.Madin@dogami.state.or.us

Browse Graphic: http://www.oregongeology.com/sub/lidar/index.htm

Data Set Credit: Raw XYZ ASCII data processed by Mark A. Sanchez, Oregon Department of Geology & Mineral Industries.
Security Information:

Security Classification System: None
Security Classification: Unclassified
Security Handling Description: None

Native Data Set Environment: Raw XYZ ASCII (text) data

Completeness Report: LIDAR data has been processed for a 441 square mile portion of the Portland, Oregon metropolitan area.
Lineage:

Source Information:

Source Citation Abbreviation: Puget Sound LIDAR Consortium web site

Process Step:

Process Description:
This shaded relief image is derived from raw XYZ LIDAR point data. The bare earth digital returns are a representation of the earth's surface where all man-made structures and vegetation have been removed. The bare earth digital elevation models were created from a subset of LiDAR returns that were classified as ground. They are regularly gridded at a six-foot post-spacing and were derived using TIN processing of the ground point returns. The elevation values are in feet. The DEM data format is ArcInfo interchange (.e00). A private contractor, TerraPoint, produced this data for the Puget Sound LiDAR Consortium.
Process Date: 20061030
Process Contact:

Contact Information:

Contact Person Primary:

Contact Person: Mark Sanchez

Contact Position: Cartographer/GIS Analyst
Contact Voice Telephone: 971 673-1557
Contact Electronic Mail Address: Mark.Sanchez@dogami.state.or.us

Indirect Spatial Reference: PSLC LIDAR data is tiled into USGS quarter quads.
Direct Spatial Reference Method: Raster
Raster Object Information:

Raster Object Type: Grid Cell

Horizontal Coordinate System Definition:

Planar:

Grid Coordinate System:

Grid Coordinate System Name: State Plane Coordinate System 1983
State Plane Coordinate System:

SPCS Zone Identifier: 3601
Lambert Conformal Conic:

Standard Parallel: 46
Standard Parallel: 44.33
Longitude of Central Meridian: -120.5
Latitude of Projection Origin: 43.667
False Easting: 8202099.738
False Northing: 0

Planar Coordinate Information:

Planar Coordinate Encoding Method: Coordinate Pair
Planar Distance Units: international feet

Geodetic Model:

Horizontal Datum Name: North American Datum of 1983/91 HARN
Ellipsoid Name: Geodetic Reference System 80
Semi-major Axis: 6378137
Denominator of Flattening Ratio: 298.257

Overview Description:

Entity and Attribute Overview: The only attributes are the elevation values and the encoded values for easting and northing coordinates. There are no attached attribute tables.

Metadata Date: 2/12/2007
Metadata Review Date:
Metadata Future Review Date:
Metadata Contact:

Contact Information:

Contact Person Primary:

Contact Person: Paul Staub
Contact Organization: Oregon Department of Geology & Mineral Industries

Contact Position: Spatial Data Specialist
Contact Address:

Address Type: mailing and physical address
Address: Suite 965
City: 800 NE Oregon Street
State or Province: Oregon
Postal Code: 97232
Country: USA

Contact Voice Telephone: 971 673-1548
Contact Facsimile Telephone: 971 673-1562
Contact Electronic Mail Address: Paul.Staub@dogami.state.or.us
Hours of Service: 8:30-5:30

Metadata Access Constraints: None
Metadata Use Constraints: None
Metadata Security Information:

Metadata Security Classification System: none
Metadata Security Classification: Unclassified
Metadata Security Handling Description: None