2014 Oregon Department of Geology and Mineral Industries (DOGAMI) Oregon Lidar DEM: Metro Portland, OR

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Oregon Department of Geology and Mineral Industries (DOGAMI)

Originator:

Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM)

Publication_Date: 20170615

Title:

2014 Oregon Department of Geology and Mineral Industries (DOGAMI) Oregon Lidar DEM: Metro Portland, OR

Publication_Information:

Publication_Place: Charleston, SC

Publisher: NOAA's Ocean Service (NOS), Office for Coastal Management (OCM)

Online_Linkage: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=6378

Online_Linkage:

https://coast.noaa.gov/htdata/raster2/elevation/OLC_metro_2014_6378

Online_Linkage: https://coast.noaa.gov/dataviewer

Online_Linkage: https://coast.noaa.gov

Description:

Abstract:

The dataset encompasses 1221.6 square miles in portions of the greater Portland Metro area in the state of Oregon. The highest hit digital surface models (DSM) represent the earth's surface with all vegetation and human-made structures included. The highest hit DSMs were derived from lidar data using TIN processing of the all-return point cloud. The bare earth digital elevation model (DEM) represents 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 DSM and DEM grid cell size is 3 feet. The projection was originally Oregon Statewide Lambert Conformal Conic, units are in International Feet. The horizontal datum is NAD 83 (2011) and the vertical datum was NAVD88 (Geoid 12A). Some elevation values have been interpolated across areas in the models where there is no elevation data (e.g. over water, over dense vegetation). Watershed Sciences, Inc. collected the lidar and created this data set for the Oregon Department of Geology and Mineral Industries (DOGAMI). Watershed Sciences, Inc. collected the lidar and created this data set for the Oregon Department of Geology and Mineral Industries (DOGAMI). The vertical units were changed from feet to meters by NOAA for ingestion into the Digital Coast Data Access Viewer.

Purpose: Provide high resolution terrain elevation data.

Supplemental_Information:

A final report for this project may be viewed at: https://coast.noaa.gov/htdata/lidar2_z/geoid12b/data/6359/supplemental/OLC_Metro_2014_Survey_Report.pdf

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20140709

Ending_Date: 20140907

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -123.779

East_Bounding_Coordinate: -121.794

North_Bounding_Coordinate: 46.173

South_Bounding_Coordinate: 45.199

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: elevation

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Bathymetry/Topography

Theme_Keyword: Lidar

Theme_Keyword: Light Detection and Ranging

Theme_Keyword: DEM

Theme_Keyword: Digital Terrain Model

Theme_Keyword: DOGAMI

Theme_Keyword: Oregon Lidar Consortium

Theme_Keyword: Elevation data

Theme_Keyword: Bare earth

Theme_Keyword: High-resolution

Theme_Keyword: Bare ground

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: United States

Place_Keyword: Oregon

Place_Keyword: Portland

Place_Keyword: Pacific Northwest

Access_Constraints: None

Use_Constraints:

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. This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, surveying, or site specific purposes. Users of this information should review or consult the primary data and information sources to ascertain the usability of the information.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: DOGAMI

Contact_Person: Jacob Edwards

Contact_Address:

Address_Type: mailing and physical

Address: 800 NE Oregon St. #28, Ste. 965

City: Portland

State_or_Province: OR

Postal_Code: 97232

Country: USA

Contact_Voice_Telephone: 971-673-1557

Contact_Electronic_Mail_Address: jacob.edwards@oregon.gov

Browse_Graphic:

Browse_Graphic_File_Name:

https://coast.noaa.gov/htdata/lidar2_z/geoid12b/data/6377/supplemental/2014_metro_area.kmz

Browse_Graphic_File_Description: A polygon footprint of this data set.

Browse_Graphic_File_Type: kmz

Data_Set_Credit: DOGAMI

Data_Quality_Information:

Logical_Consistency_Report:

Upon receipt from vendor (WSI), all LiDAR data was independently reviewed by staff from the Oregon Department of Geology and Mineral Industries (DOGAMI) to ensure project specifications were met. All data were inventoried for completeness and data were checked for quality, which included examining LiDAR data for errors associated with internal data consistency, model quality, and accuracy.

Completeness_Report:

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

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: unknown

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Vertical accuracy compares the delivered bare-earth digital elevation models (DEMS) with independent ground check points (GCPs) collected by DOGAMI staff. These variations in elevation values were used to produce a mean vertical error and vertical root mean square error (RMSE) value for the entire delivered data set. Project specifications list the maximum acceptable mean vertical offset to be 0.20 meters (0.65 feet) and the maximum vertical RSME to not exceed 0.0925 meters (0.303 feet).
A total of 2425 measured GCP's were obtained in the Metro project area and were compared with the lidar elevation grids. The data delivered to DOGAMI was found to have a mean vertical offset of -0.094 meters (0.308 feet) and an RMSE value of 0.053 meters (0.174 feet). Offset values ranged from -0.667 meters (-2.19 feet) to 0.772 meters (2.53 feet).
For more information about the vertical accuracy, please refer to the final report, listed above in the Supplemental_Information field of this metadata record.

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 0.053

Vertical_Positional_Accuracy_Explanation:

The approach adopted for DOGAMI lidar surveys was comprised of three components:
1) Verify the horizontal and vertical coordinates established by Watershed Sciences for a select number of survey monuments used to calibrate the lidar survey. These surveys typically involved a minimum of two hours of GPS occupation over a known point. The collected data were then submitted to the National Geodetic Survey (NGS) Online Positioning User Service (OPUS) for post-processing against several Continuously Operating Reference Stations (CORS) operated by the NGS.
2) Collect GCP's along relatively flat surfaces (roads, paths, parking lots etc.). This step involved the collection of both continuous measurements (from a vehicle as well as from a backpack) as well as static measurements (typically 5 epochs).
3) Having collected the GCP data, the GPS data was post-processed using Trimble Business Center software. Data post-processing typically involved calibrations against at least three CORS stations as well as from local site calibrations performed in the field using those benchmarks that had been independently verified. Data is post processed to refine measurements so that horizontal and vertical errors are less than 0.02 meters (0.065 feet). Horizontal accuracy of data is tested by reoccupying a sample subset of survey monuments used for processing of lidar data. Each occupation's x and y coordinates are compared with the vendor coordinates for offsets.

Lineage:

Process_Step:

Process_Description:

Acquisition. LiDAR data acquisition was conducted from July 9th, 2014 to September 7th, 2014. The survey utilized a Leica ALS70 and an Optech Orion H laser system mounted in a Cessna 208B. Scan angles near nadir were used to increase penetration of vegetation to ground surfaces. Ground level GPS and aircraft IMU were collected during the flight.

Process_Date: 20140709

Process_Step:

Process_Description:

Processing. 1. TRAJECTORY: Aircraft trajectory (position and attitude) were calculated based on on-board GPS and IMU data with post-processing refinement through coincident static GPS collection. 2. POST-PROCESSING: Laser point return coordinates (x,y,z) were computed using sensor-specific post processing software, combining LiDAR return range and intensity information with aircraft trajectory information. 3. INITIAL QAQC: The post-processed LiDAR files were assembled into flight lines and reviewed for gaps and consistency, as well as systematic noise. 4. CALIBRATION: Custom algorithms evaluated individual swaths for misalignments based on IMU configuration as well as aircraft attitude variability. Offsets were resolved through surface and linear matching algorithms that minimize variability in elevation and slope. Descriptive statistics, thresholds, and specifications providing transparency for data calibration are discussed in the accompanying Data Report. 5. GROUND MODELING: Ground classified point cloud was generated through proprietary data processing tools, with settings and thresholds appropriate to landscape and vegetation condition. 6. ARTIFACT FILTRATION: Noise and processing artifacts were filtered using post-processing software and proprietary quality control methods. 7. ACCURACY ASSESSMENT: Vertical accuracy for the LiDAR dataset was assessed against Ground Check Points (GCP) distributed throughout the study area. See the accompanying Data Report for methodology, descriptive statistics, and relevant standards and reporting language. 8. DATA PRODUCT: LiDAR points classified as 'ground' were output as a digital elevation model (DEM).

Process_Date: 20140907

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: WSI

Contact_Address:

Address_Type: mailing and physical

Address: 421 SW 6th Avenue, Suite 800

City: Portland

State_or_Province: OR

Postal_Code: 97204

Contact_Voice_Telephone: (503) 505-5100

Process_Step:

Process_Description:

The NOAA Office for Coastal Management (OCM) received the files in the proprietary ESRI grid format. The files were converted to floating point GeoTIFF format in vertical meters using gdal_translate from GDAL version 2.1.1.

Process_Date: 201709

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: NOAA Office for Coastal Management

Contact_Address:

Address_Type: mailing and physical

Address: 2234 South Hobson Avenue

City: Charleston

State_or_Province: SC

Postal_Code: 29405-2413

Contact_Voice_Telephone: 843-740-1202

Contact_Electronic_Mail_Address: coastal.info@noaa.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Oregon Statewide Lambert Conformal Conic

Lambert_Conformal_Conic:

Standard_Parallel: 43

Standard_Parallel: 45.5

Longitude_of_Central_Meridian: -120.5

Latitude_of_Projection_Origin: 41.75

False_Easting: 1312335.958005249

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 3

Ordinate_Resolution: 3

Planar_Distance_Units: foot

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983 (2011)

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988 (NAVD88; Geoid12a)

Altitude_Resolution: 0.001

Altitude_Distance_Units: Meters

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: NOAA Office for Coastal Management

Contact_Address:

Address_Type: mailing and physical

Address: 2234 South Hobson Avenue

City: Charleston

State_or_Province: SC

Postal_Code: 29405-2413

Contact_Voice_Telephone: 843-740-1202

Contact_Electronic_Mail_Address: coastal.info@noaa.gov

Resource_Description: Downloadable Data

Distribution_Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of the Oregon Department of Geology and Mineral Industries (DOGAMI), the Office for Coastal Management or its partners.

Custom_Order_Process:

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer

Metadata_Reference_Information:

Metadata_Date: 20170926

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: NOAA Office for Coastal Management

Contact_Address:

Address_Type: mailing and physical

Address: 2234 South Hobson Avenue

City: Charleston

State_or_Province: SC

Postal_Code: 29405-2413

Contact_Voice_Telephone: 843-740-1202

Contact_Electronic_Mail_Address: coastal.info@noaa.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998