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Short Citation:
OCM Partners, 2022: 2008 Kenai Watershed Forum Topographic LiDAR: Kenai Peninsula, Alaska, https://www.fisheries.noaa.gov/inport/item/49620.

Item Identification

Title: 2008 Kenai Watershed Forum Topographic LiDAR: Kenai Peninsula, Alaska
Short Name: ak2008_kwf_kenai_m2512_metadata
Status: Completed
Publication Date: 2013-06
Abstract:

This delivery contains point cloud data in LAS 1.1 format, classified in the following manner. Class 0: Never Classified, Class 1: Unclassified, Class 2: Ground, Class 7: Low/High Point (Noise), and

Class 12: Overlap.

The following are the collection parameters and equipment used to create these data sets.

Aircrafts: Cessna 320 (N3443Q) and Piper Navajo (N6GR)

Lidar System: Optech ALTM Gemini (03SEN145)

Approximate Collection Altitude (Above Mean Terrain): 1800 meters

Ground Speed: 180 kts

Pulse Rate Frequency: 70 kHz

Mirror Scan Frequency: 40 Hz

Scan Angle (+/-): 16 degrees

Beam Divergence: Narrow (0.25 mrad)

Accuracy statements are based on areas of moderate terrain, with points classified as ground. Diminished accuracies are to be expected in areas of extreme terrain

and dense vegetation. The accuracy of each point is expected to meet the vertical accuracy standard, derived products may be less accurate in areas of extreme terrain

and dense vegetation due to a lesser number of points defining the ground in these areas.

Classified data sets such as this one may have varying posting due to some pulses not reaching the ground.

Be aware the the Western Kenai Lowlands and Eastern Kenai Watershed have different accuracies and point spacings. Read this metadata record thoroughly to determine what the accuracies and point

spacing are for your area of interest.

USGS Contract No. 07CRCN0002

USGS Task Order No. 07002C0021.

Purpose:

The purpose of this data set is to provide bare-earth processed lidar data over the western lowlands of the Kenai Peninsula, at a minimum point density of 0.5 points

per square meter.

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None Bare-Earth
None Terrain

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: las
Entity Attribute Overview:

LiDAR points in LAS V1.1 fomat (ASPRS Classes 0,1,2,7,10,12,14,15,16,17)

Entity Attribute Detail Citation:

none

Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of United States Geological Survey,

Kenai Watershed Forum, Geophysical Institute- University of Alaska Fairbanks, Aero-Metric, NOAA, the Office for Coastal Management

or its partners.

Support Roles

Data Steward

CC ID: 670189
Date Effective From: 2013-06
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: 670191
Date Effective From: 2013-06
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: 670192
Date Effective From: 2013-06
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: 670190
Date Effective From: 2013-06
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: 1134076
W° Bound: -151.884262
E° Bound: -148.853429
N° Bound: 61.045039
S° Bound: 59.579103

Extent Group 1 / Time Frame 1

CC ID: 1134075
Time Frame Type: Range
Start: 2008-05-20
End: 2008-10-29

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=2512

;

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. These data

depict the heights at the time of the survey and are only accurate for that time.

Distribution Information

Distribution 1

CC ID: 740377
Start Date: 2013
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2512
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2013-06 - Present)
File Name: Customized Download
Description:

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

File Type: Zip

Distribution 2

CC ID: 740378
Start Date: 2013
End Date: Present
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2512/index.html
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2013-06 - Present)
File Name: Bulk Download
Description:

Simple download of data files. These are in an orthometric vertical datum and differ from the datum described here.

File Type: LAZ

URLs

URL 1

CC ID: 740380
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2512/supplemental/ak2008_kwf_kenai_footprint.KMZ
Name: browse graphic
URL Type:
Online Resource
File Resource Format: kmz
Description:

KMZ file showing the footprint of the area covered.

URL 2

CC ID: 740381
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2512/supplemental/ak2008_kwf_kenai_lidarareasmap.pdf
Name: Area map
URL Type:
Online Resource
File Resource Format: pdf
Description:

Map of the area described in this metadata.

Activity Log

Activity Log 1

CC ID: 670209
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 670208
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: 718160
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 740379
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Horizontal Positional Accuracy:

All these data products were acquired at 1800 meters above mean terrain (AMT). The Western Kenai Lowlands (Areas A,B,C,D,E) have a horizontal accuracy of 0.7 meter, with a nominal point spacing of 1.4 meters

as per manufacturer's specifications, not field verified. The Eastern Kenai Watershed (Areas F,G,H) has a horizontal accuracy of 2.0 meters, with a nominal point spacing of 3.0 meters, not field verified.

See map in Supplemental Information above for Area Index.

; Quantitative Value: 2.0 meters, Test that produced the value:

Horizontal accuracy in meters, not tested, for the Eastern Kenai Watershed (Areas F,G,H). The Western Kenai Lowlands (Areas A,B,C,D,E) have

horizontal accuracy closer to .7 meters, not tested. See map in Supplemental Information above for Area Index.

Vertical Positional Accuracy:

These values were computed by verifying the ground classified lidar data against ground surveyed points in the land cover categories as described by FEMA. The points

were collected throughout the project area, by DOWL/HKM. We recommend additional ground truth surveys of the data set to verify the vertical accuracy has not changed

due to natural causes, such as techtonic motion or freeze/thaw cycles, and non-natural causes such as road construction. Without ground truth survey checks this data

is not recommended for design grade mapping or engineering.

; Quantitative Value: 0.47 meters, Test that produced the value:

Fundamental vertical accuracy in meters at the 95th percentile in open terrain for areas the Eastern Kenai Watershed (Areas F,G,H). The Western Kenai Lowlands (Areas A,B,C,D,E) have

vertical accuracy closer to .10 meters FVA at the 95th percentile in open terrain.

See map in Supplemental Information above for Area Index.

Completeness Report:

Complete

Conceptual Consistency:

Data has been verified using surveyed check points, in the land cover categories required by Appendix A to FEMA's Guidelines and Specifications.

All data was collected to meet the National Standard for Spatial Database Accuracy (NSSDA).

Lineage

Process Steps

Process Step 1

CC ID: 1134064
Description:

System Calibration:

Aero-Metric collected data over a previously surveyed area in Palmer, Alaska. Data was collected at the same settings as this project, using two intersecting perpendicular lines. Two GPS ground stations were operating on

site in order to minimize GPS error. The data was classified in each line separately for ground and other common features between lines, such as building roofs. This data was processed in TerraMatch 8.001 (TerraSolid, Ltd.),

to compute corrections for roll, pitch, heading, and mirror scale. These corrections were applied to the initial processing settings (.res file). The data was reprocessed to verify the corrections were applied properly. The

corrected data was then compared to ground surveyed measurements in order to check for any consistent vertical bias. The final step in calibration verified there was minimal vertical noise due to changes in intensity. This

was done by comparing elevations of points on the airport runway, one point on a runway stripe and another adjacent point on the pavement.

Process Date/Time: 2008-06-10 00:00:00

Process Step 2

CC ID: 1134066
Description:

Create a smoothed-best estimated trajectory (SBET) of the sensor at a rate of 200 Hz, by integrating the airborne GPS and IMU data The basis of the GPS coordinates were provided to Aero-Metric by DOWL/HKM, and were referenced

to NAD83 (CORS96) with GEOID06 derived orthometric heights. The maximum baseline distance for this area was 23 km, the average base line length was 15 km. The mean GPS positional accuracy for this area was +/- 0.05 meters.

Process Date/Time: 2008-07-28 00:00:00

Process Step 3

CC ID: 1134067
Description:

Integrate SBET and raw laser data to produce point cloud data in LAS 1.1 format for each flight line.

Process Date/Time: 2008-07-28 00:00:00

Process Step 4

CC ID: 1134068
Description:

Compute the roll, pitch, heading, and mirror scale correction factors for each flight line, then apply corrections to the corresponding flight line.

Process Date/Time: 2008-07-28 00:00:00

Process Step 5

CC ID: 1134069
Description:

Automated classification of the bare-earth data from the lidar point cloud using a series of algorithms customized for the types of terrain encountered in the project.

Process Date/Time: 2008-08-21 00:00:00

Process Step 6

CC ID: 1134070
Description:

Manual classification of any data which appears to be bare-earth but was not properly classified using the automated methods.

Process Date/Time: 2008-08-22 00:00:00

Process Step 7

CC ID: 1134071
Description:

Create point clouds in LAS 1.1 format for all returns.

Process Date/Time: 2010-01-21 00:00:00

Process Step 8

CC ID: 1134072
Description:

Data verified using survey control points, located throughout the area.

Process Date/Time: 2009-10-02 00:00:00

Process Step 9

CC ID: 1134073
Description:

Metadata updated for Bounding coordinates, Spatial Reference info using FGDC template

Process Date/Time: 2010-01-21 00:00:00

Process Step 10

CC ID: 1134065
Description:

The NOAA Office for Coastal Management (OCM) received the topographic files in LAS V1.1 format. The files contained lidar elevation and intensity measurements. The data were received in

Alaska State Plane Zone 4 (FIPS 5004), NAD83 coordinates and were vertically referenced to NAVD88 using the Geoid06 model. The vertical units of the data were feet. OCM performed the following processing for data storage and Digital Coast provisioning purposes:

1. The User_Data field of the LAS files' header was set to a value (0-7) to reflect the LiDAR Data Areas (Area A: 0, Area B: 1, Area C: 2, Area D: 3, Area E: 4, Area F: 6, Area G: 5, Area H: 7)

2. The classification scheme was rearranged. Class 10 (High Noise) was combined into Class 7 (Low Noise). Class 11 (Single Return, not ground) was reclassified as Class 10. Class 13 (1st return of many returns) was reclassfied as Class 14. Class 14 (2nd return of many) was reclassified as Class 15. Class 15 (3rd of many returns) was reclassified as Class 16. Class 16 (Last return of many) was reclassified as Class 17. (see next processing step for further changes)

3. The topographic las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid06.

4. The topographic las files were converted from a Projected Coordinate System (AK SP Zone 4) to a Geographic Coordinate system (NAD83).

5. The topographic las files' vertical units were converted from feet to meters.

6. The topographic las files' horizontal units were converted from feet to decimal degrees.

Process Date/Time: 2013-07-01 00:00:00
Process Contact: NOAA Office for Coastal Management (NOAA/OCM)
Phone (Voice): (843) 740-1202
Email Address: coastal.info@noaa.gov

Process Step 11

CC ID: 1182762
Description:

The NOAA Office for Coastal Management simplified the classification scheme because the classes signifying return numbers were replicating information already in the files. Classes 10, 14, 15, 16, and 17 were moved to class 1. The information content is retained in the return numbers while allowing the files to adhere to the LAS 1.1 classification standard.

Process Date/Time: 2022-08-29 00:00:00
Process Contact: NOAA Office for Coastal Management (NOAA/OCM)
Phone (Voice): (843) 740-1202
Email Address: coastal.info@noaa.gov

Catalog Details

Catalog Item ID: 49620
GUID: gov.noaa.nmfs.inport:49620
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:21+0000
Metadata Record Last Modified By: Kirk Waters
Metadata Record Last Modified: 2022-08-29 10:35+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