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Short Citation:
OCM Partners, 2022: 2010 OR DOGAMI: Glass Buttes Study Area, https://www.fisheries.noaa.gov/inport/item/49918.

Item Identification

Title: 2010 OR DOGAMI: Glass Buttes Study Area
Short Name: or2010_glass_buttes_m1475_metadata
Status: Completed
Publication Date: 2013-08
Abstract:

Metadata for the LAS files was not provided to NOAA OCM. This metadata record contains information derived from the Watershed

Sciences, Inc. lidar report. This report may be accessed at: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1475/supplemental/GlassButtes.pdf

This LiDAR data set was collected between May 8 and May 14, 2010 and falls in portions of Deschutes, Harney, and Lake

counties in the Glass Buttes area of Oregon. The total pulse density is 9.26 pulses per square meter over terrestrial surfaces.

The requested lidar area of interest (AOI) totaled 84,849 acres, but was buffered to ensure data coverage, resulting in a total

area flown (TAF) of 86,631 acres.

This data set consists of ground (bare earth) and unclassified points.

In some areas of heavy vegetation or forest cover, there may be relatively few ground points in the LiDAR data. Elevation values

for open water surfaces are not valid elevation values because few LiDAR points are returned from water surfaces. LiDAR intensity

values were also collected.

Original contact information:

Contact Name: Ian Madin

Contact Org: DOGAMI

Phone: 971-673-1542

Email: ian.madin@dogami.state.or.us

Purpose:

Provide high resolution terrain elevation and land cover elevation data.

Notes:

10562

Supplemental Information:

The final LiDAR Report for the Glass Buttes study area may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1475/supplemental/GlassButtes.pdf

A footprint of this data set may be viewed in Google Earth at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1475/supplemental/2010_Ormat_Technologies_Glass_Buttes_Lidar.kmz

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None Bare earth
None Bare ground
None DOGAMI
None High-resolution
None Light Detection and Ranging

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
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), Ormat Technologies, the Office for Coastal Management or its partners.

Support Roles

Data Steward

CC ID: 683220
Date Effective From: 2013-08
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: 683222
Date Effective From: 2013-08
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: 683223
Date Effective From: 2013-08
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: 683221
Date Effective From: 2013-08
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: 1133642
W° Bound: -120.212064
E° Bound: -119.883592
N° Bound: 43.639504
S° Bound: 43.46455

Extent Group 1 / Time Frame 1

CC ID: 1133641
Time Frame Type: Range
Start: 2010-05-08
End: 2010-05-14

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

This data can be obtained on-line at the following URL:

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1475

This data set is dynamically generated based on user-specified parameters.;

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: 742079
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1475
Distributor:
File Name: Customized Download
Description:

Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

Distribution 2

CC ID: 742080
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1475/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 742082
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 742083
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 742084
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1475/supplemental/2010_Ormat_Technologies_Glass_Buttes_Lidar.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage for the Glass Buttes Study Area.

Activity Log

Activity Log 1

CC ID: 683247
Activity Date/Time: 2017-03-20
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 683246
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 718500
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 742081
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Horizontal Positional Accuracy:

Not specified in final report, assumed to be 1 m.

Vertical Positional Accuracy:

The Root Mean Square Error (RMSE) of the data is 0.03 meters. Accuracy was assessed using 1,695 ground survey RTK (real time

kinematic) points. These ground survey points are distributed throughout the study area.

The final LiDAR Report for the Glass Buttes study area may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1475/supplemental/GlassButtes.pdf

Completeness Report:

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

Conceptual Consistency:

The area of interest was surveyed with opposing flight line side-lap of greater than or equal to 50 percent (greater than

100 percent overlap) to reduce laser shadowing and increase surface laser painting.

Lineage

Process Steps

Process Step 1

CC ID: 1133637
Description:

No metadata for the lidar point data was provided to NOAA OCM with this data set. The following process step contains information

derived from the Ormat Technologies lidar report. This lidar report may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1475/supplemental/GlassButtes.pdf

Acquisition

Ground Survey - Instrumentation and Methods

During the LiDAR survey, static (1 Hz recording frequency) ground surveys were conducted over monuments with known coordinates.

After the airborne survey, the static GPS data were processed using triangulation with CORS stations and checked against the Online

Positioning User Service (OPUS2) to quantify daily variance. Multiple sessions were processed over each monument to confirm antenna

height measurements and reported position accuracy.

Multiple differential GPS units were used in the ground based real-time kinematic (RTK) portion of the survey. To collect

accurate ground surveyed points, a GPS base unit was set up over monuments to broadcast a kinematic correction to a roving

GPS unit. The ground crew used a roving unit to receive radio-relayed kinematic corrected positions from the base unit.

This RTK survey allowed precise location measurement (sigma less than or equal to 1.5 cm).

Lidar Point Data

The lidar data were collected between May 8 and May 14, 2010. The LiDAR survey utilized a Leica ALS60 sensor mounted in a

Cessna Caravan 208B. The Leica ALS60 system was set to acquire greater than or equal to 105,000 laser pulses per second

(i.e., 105 kHz pulse rate) and flown at 900 meters above ground level (AGL), capturing a scan angle of 14 degrees from nadir.

These settings are developed to yield points with an average native pulse density of greater than or equal to 8 points per

square meter over terrestrial surfaces. Some types of surfaces (i.e., 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 vary according to

distributions of terrain, land cover, and water bodies.

The area of interest was surveyed with opposing flight line side-lap of greater than or equal to 50 percent (greater than or equal to

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, an accurate description of aircraft position and attitude is vital. Aircraft position is described as x, y, and z

and measured twice per second (2 Hz) by an onboard differential GPS unit. Aircraft attitude was measured 200 times

per second (200 Hz) as pitch, roll, and yaw (heading) from an onboard inertial measurement unit (IMU).

Processing

Aircraft Kinematic GPS and IMU Data

LiDAR survey datasets were referenced to 1 Hz static ground GPS data collected over a pre-surveyed monument with known

coordinates. While surveying, the aircraft collected 2 Hz kinematic GPS data and the inertial measurement unit (IMU)

collected 200 Hz attitude data. Waypoint GraphNav v.8.10 was used to process the kinematic corrections for the aircraft.

The static and kinematic GPS data were then post-processed after the survey to obtain an accurate GPS solution and aircraft

positions. IPAS Pro v.1.3 was used to develop a trajectory file including corrected aircraft position and attitude information.

The trajectory data for the entire flight survey session were incorporated into a final smoothed best estimated trajectory (SBET)

file containing accurate and continuous aircraft positions and attitudes.

Process Date/Time: 2010-01-01 00:00:00

Process Step 2

CC ID: 1133638
Description:

Lidar Point Data

Laser point coordinates were computed using the IPAS and ALS Post Processor software suites based on independent data

from the LiDAR system (pulse time, scan angle), and aircraft trajectory data (SBET). Laser point returns (first through fourth)

were assigned an associated (x, y, and z) coordinate along with unique intensity values (0-255). The data were output into

large LAS v. 1.2 files; each point maintaining the corresponding scan angle, return number (echo), intensity, and x, y, and

z (easting, northing, and elevation) information. Flightlines and LiDAR data were then reviewed to ensure complete coverage

of the study area and positional accuracy of the laser points.

Once the laser point data were imported into TerraScan, a manual calibration was performed to assess the system offsets

for pitch, roll, heading and mirror scale. Using a geometric relationship developed by Watershed Sciences, each of these

offsets was resolved and corrected if necessary.

The LiDAR points were then filtered for noise, pits and birds by screening for absolute elevation limits, isolated points

and height above ground. The data were then inspected for pits and birds manually, and spurious points were removed.

For a .las file containing approximately 7.5-9.0 million points, an average of 50-100 points were typically found to be

artificially low or high. These spurious non-terrestrial laser points must be removed from the dataset. Common sources of

non-terrestrial returns are clouds, birds, vapor, and haze.

Internal calibration was refined using TerraMatch. Points from overlapping lines were tested for internal consistency

and final adjustments made for system misalignments (i.e., pitch, roll, heading offsets and mirror scale). Automated sensor

attitude and scale corrections yielded 3-5 cm improvements in the relative accuracy. Once the system misalignments were

corrected, vertical GPS drift was resolved and removed per flight line, yielding a slight improvement (<1 cm) in relative

accuracy. In summary, the data must complete a robust calibration designed to reduce inconsistencies from multiple sources

(i.e., sensor attitude offsets, mirror scale, GPS drift).

The TerraScan software suite is designed specifically for classifying near-ground points (Soininen, 2004). The processing

sequence begins by removing all points that are not near the earth based on geometric constraints used to evaluate

multi-return points. The resulting bare earth (ground) model is visually inspected and additional ground point modeling is

performed in site-specific areas (over a 50-meter radius) to improve ground detail. This is only done in areas with known

ground modeling deficiencies, such as: bedrock outcrops, cliffs, deeply incised stream banks, and dense vegetation.

In some cases, ground point classification includes known vegetation (i.e., understory, low/dense shrubs, etc.) and these

points are manually reclassified as non-grounds. Ground surface rasters are developed from triangulated irregular

networks (TINs) of ground points.

Process Date/Time: 2010-01-01 00:00:00

Process Step 3

CC ID: 1133639
Description:

The NOAA Office for Coastal Management (OCM) received the files in las format. The files contained LiDAR

elevation and intensity measurements. The data were in UTM Zone 11 (NAD83) coordinates and NAVD88 (Geoid03) vertical datum.

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

1. The data were converted from UTM Zone 11 (NAD83) coordinates to geographic coordinates.

2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights using Geoid03.

3. The data were sorted by time and zipped to laz format.

4. The metadata was updated in 2014 to reflect DOGAMI as an originator and the title of the project was also altered to reflect the association with existing DOGAMI projects. All acknowledgements for Ormat Technologies remain the same.

Process Date/Time: 2013-02-01 00:00:00

Catalog Details

Catalog Item ID: 49918
GUID: gov.noaa.nmfs.inport:49918
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:23+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2022-03-16
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-03-16
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-03-16