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Short Citation:
OCM Partners, 2023: 2004 Klamath Tribes Lidar DEM: Sprague River, OR, https://www.fisheries.noaa.gov/inport/item/67360.

Item Identification

Title: 2004 Klamath Tribes Lidar DEM: Sprague River, OR
Status: Completed
Creation Date: 2004
Abstract:

No metadata record for this data set was provided to the NOAA Office for Coastal Management (OCM). This record was created with information from the data report. A link to the data report is provided in the URL section of this metadata record.

Watershed Sciences, Inc. (WS) collected Light Detection and Ranging (LiDAR) data for the Klamath Tribes over a seven day span in November, 2004. Conditions included leaf off and a normal fall low flow condition. The survey area encompassed the Sprague River, the lower Sycan River, and the lower reaches of the North and South Forks of the Sprague River. The study area was buffered by 500 meters to ensure complete coverage of important areas.

A total of 1,469,351,015 laser points were collected over the study area using an Optech ALTM 3100 LiDAR system set to acquire points at average spacing of less than 0.68 meters (greater than 2 points per square meter). The system also recorded individual return intensities (per laser return) that are used to create combined elevation models that display both elevation and surface reflectivity. These data were used to create this Digital Elevation Model (DEM) at 1m grid spacing, in UTM Zone 10, NAVD88 using Geoid03.

Purpose:

To provide high resolution elevation data that is used to produce three-dimensional models of the earth surface.

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
ISO 19115 Topic Category
elevation
UNCONTROLLED
None DEM

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > OREGON
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > LAND SURFACE

Instrument Keywords

Thesaurus Keyword
UNCONTROLLED
Global Change Master Directory (GCMD) Instrument Keywords Earth Remote Sensing Instruments > Active Remote Sensing > Profilers/Sounders > Lidar/Laser Sounders > LIDAR > Light Detection and Ranging

Platform Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Platform Keywords
AIRCRAFT

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Elevation
Maintenance Frequency: None Planned
Data Presentation Form: Model (digital)
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of the Oregon Lidar Consortium (OLC), DOGAMI, NOAA, the Office for Coastal Management or its partners.

Data Set Credit: DOGAMI

Support Roles

Data Steward

CC ID: 1175089
Date Effective From: 2022
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 1175090
Date Effective From: 2022
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 1175091
Date Effective From: 2022
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 1175092
Date Effective From: 2022
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1175112
W° Bound: -121.88735
E° Bound: -120.93979
N° Bound: 42.63519
S° Bound: 42.33066

Extent Group 1 / Time Frame 1

CC ID: 1175110
Time Frame Type: Discrete
Start: 2004-11
Description:

Collection Dates

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Reference Systems

Reference System 1

CC ID: 1175114

Coordinate Reference System

CRS Type: Vertical
EPSG Code: EPSG:5703
EPSG Name: NAVD88 height
See Full Coordinate Reference System Information

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for bulk and custom downloads.

Data Access Constraints:

None

Data 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.

Distribution Information

Distribution 1

CC ID: 1175094
Start Date: 2022-06-08
End Date: Present
Download URL: https://chs.coast.noaa.gov/htdata/raster5/elevation/OR_SpragueRiver_DEM_2004_9513
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2022 - Present)
File Name: Bulk Download
Description:

Bulk download of DEM files in GeoTIFF format, UTM Zone 10N (NAD83 HARN), meter coordinates, NAVD88 orthometric heights using Geoid03 in meters.

File Type: GeoTIFF
Compression: Zip

Distribution 2

CC ID: 1175093
Start Date: 2022-06-08
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=9513/details/9513
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2022 - Present)
File Name: Customized Download
Description:

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.

File Type: Zip

URLs

URL 1

CC ID: 1175095
URL: https://coast.noaa.gov/dataviewer/
Name: NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV)
URL Type:
Online Resource
File Resource Format: HTML
Description:

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.

URL 2

CC ID: 1175096
URL: https://www.oregongeology.org/pubs/ldq/reports/Sprague_River_Lidar_Report_2005.pdf
Name: Data report
URL Type:
Online Resource
File Resource Format: pdf
Description:

Data report as hosted on the Oregon Department of Geology and Mineral Industries' Oregon Lidar Commission.

Data Quality

Vertical Positional Accuracy:

This is the comparison of laser points to real time kinematic (RTK) ground level survey data. A total of 967 RTK GPS measurements were compared to ground laser points collected along a variety of surfaces, such as roads, riparian zones, and fields to provide a greater diversity of points for comparison. The deviation RMSE is 0.052 meters, standard deviation is 0.051 meters, with a median (50th percentile) absolute deviation of 0.032 meters and a 95th percentile of 0.1057 meters.

Data Management

Have Resources for Management of these Data Been Identified?: Yes
Approximate Percentage of Budget for these Data Devoted to Data Management: Unknown
Do these Data Comply with the Data Access Directive?: Yes
Actual or Planned Long-Term Data Archive Location: NCEI-CO
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

Data is backed up to tape and to cloud storage.

Lineage

Lineage Statement:

Watershed Sciences, LLC collected Light Detection and Ranging (LIDAR) data in the Union Baker project area for DOGAMI. NOAA OCM received the data and ingested it into the Digital Coast Data Access Viewer for distribution.

Sources

processed lidar data

CC ID: 1175104
Contact Role Type: Originator
Contact Type: Organization
Contact Name: Watershed Sciences, LLC

raw lidar data

CC ID: 1175105
Contact Role Type: Originator
Contact Type: Organization
Contact Name: Watershed Sciences, LLC

Process Steps

Process Step 1

CC ID: 1175106
Description:

Lidar Collection:

The LiDAR system was mounted in the belly of a Cessna Caravan 208. Quality control (QC) flights were performed based on manufacturer's specifications prior to the survey. The QC flight was conducted at the Ashland Airport using known surveyed control points. The positional accuracy of the LiDAR (x, y, z) returns were checked against these known locations to verify the calibration and to report base accuracy. The Optech 3100 system was set to a 50kHz laser repetition rate and flown at 1,000 meters AGL, capturing a 36 o scan width (18 o from NADIR). These settings yielded points with an average spacing of less than 0.68 meters (greater than 2 points per square meter). The entire area was surveyed with opposing flight line overlap of 30% to reduce laser shadowing and increase surface laser painting. While the system allows up to four range measurements per pulse, only the first and last returns were processed in the output.

The data stream from the IMU was stored independently during the flight, and was differentially corrected and integrated with LiDAR pulse data during post processing. Throughout the survey, two dual frequency DGPS Trimble 5700 base stations recorded fast static (1 Hz) data. Two stations were located at National Geodetic Survey (NGS) monuments in Chiloquin and Bly to minimize kinematic solution baselines and increase

GPS data accuracy.

Data Processing:

Laser point return coordinates were computed using the REALM software suite based on independent data from the LiDAR system (pulse time, scan angle), IMU (aircraft attitude), and aircraft position (differentially corrected and optimized using the multiple DGPS base stations data). The inertial measurement data were used to calculate the kinematic corrections for the aircraft trajectories using PosPAC v4.1. Flight lines and LiDAR data were reviewed to ensure complete coverage of the study area and positional accuracy of the laser points.

TerraScan Processing:

To facilitate laser point processing, the first step is to create bins (polygons) that divide the data set into manageable sizes. The entire buffered study area was divided into 465 individual bins with a maximum size of 2.25 km2, capturing all 111 flight lines (see Project Report).

Laser point returns (first and last) are assigned an associated (x, y, z) coordinate, along with unique intensity values. The raw LiDAR points were filtered for noise, pits and birds by screening for absolute elevation limits, isolated points and height above ground. These data have passed initial screening and are deemed accurate; however, ground modeling processing has not been completed on these laser points.

The TerraScan software suite is designed specifically for developing a standard bare earth model to remove buildings, vegetation, and other features. The initial bare earth model retains bridges and overpasses, and these artifacts are removed manually. The high point density and multiple returns result in uncomplicated identification of vegetated and obscured areas using first and last returns. The processing sequence begins by removing all points that are not near the earth based on evaluation of the multi-return layers. The resulting bare earth (ground) model is visually inspected and additional ground modeling is performed in site specific areas (over a 50 meter radius) to improve ground detail. This was only done in areas with known ground modeling deficiencies, such as: bedrock outcrops, cliffs, deeply incised stream banks, and dense vegetation.

Process Date/Time: 2012-01-01 00:00:00

Process Step 2

CC ID: 1175107
Description:

Description of Processing Steps:

Units: Meters

Projection: UTM Zone 10, NAD83 NAVD88, Geoid03

1. Import point data into 465 bins

2. Perform relative accuracy testing.

3. Removing False LiDAR Points: False high and low points were removed by establishing thresholds for point removal that are above and below the known terrain elevations.

4. Calculate bare ground model from last return points, with the maximum building size of 100 m2 and maximum terrain angle of 88o . The challenge is to remove buildings and vegetation, but leave rock outcrops and cliffs.

Important: Water points are left in the bare earth model because it is unclear which points are water and which are mud flat, river bed, rocks, etc.

5. Manual removal of bridges and highway spans.

6. Generate TINs within all bins (including points 100 m outside) and export ASCII lattice files for first return and ground points.

7. No weeding or superfluous point removal was performed. The intent of a LiDAR survey is to accurately place points on targets, not remove points. If laser noise is low and internally consistent, aside from pits and birds, it assumed that the remaining laser returns are from targets within the survey area.

8. Create ESRI 1 meter GRIDs

9. Create ½ meter QTViewer GRIDs and point data.) before triangulation.

Process Date/Time: 2005-01-01 00:00:00

Process Step 3

CC ID: 1175108
Description:

The NOAA Office for Coastal Management (OCM) received 19 bare earth DEM files in ArcGRID format from DOGAMI. The data were in UTM 10N (NAD 83 HARN), meters coordinates and NAVD88 (Geoid03) elevations in meters. The grid spacing was 1m.

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

1. Data were converted to GeoTiff format using GDAL 2.4.0 to comply with the open data policy

Process Date/Time: 2022-06-08 00:00:00
Process Contact: NOAA Office for Coastal Management (NOAA/OCM)
Phone (Voice): (843) 740-1202
Email Address: coastal.info@noaa.gov
Source: processed lidar data

Catalog Details

Catalog Item ID: 67360
GUID: gov.noaa.nmfs.inport:67360
Metadata Record Created By: Blake Waring
Metadata Record Created: 2022-06-08 15:53+0000
Metadata Record Last Modified By: Rebecca Mataosky
Metadata Record Last Modified: 2022-10-05 13:53+0000
Metadata Record Published: 2022-06-08
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-06-08
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-06-08