49620
2008 Kenai Watershed Forum Topographic LiDAR: Kenai Peninsula, Alaska
ak2008_kwf_kenai_m2512_metadata
Data Set
Published / External
49401
Lidar - partner (no harvest)
Project
Completed
2013-06
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.
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.
Theme
ISO 19115 Topic Category
elevation
Theme
Bare-Earth
Theme
Terrain
Office for Coastal Management
Charleston
SC
Data Set
As Needed
las
LiDAR points in LAS V1.1 fomat (ASPRS Classes 0,1,2,7,10,12,14,15,16,17)
none
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.
Data Steward
2013-06
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Distributor
2013-06
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Metadata Contact
2013-06
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Point of Contact
2013-06
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Ground Condition
-151.884262
-148.853429
61.045039
59.579103
Range
2008-05-20
2008-10-29
Yes
Unclassified
This data can be obtained on-line at the following URL:
https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2512
;
None
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.
2013
https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2512
2013-06
Organization
NOAA Office for Coastal Management
Customized Download
Create custom data files by choosing data area, product type, map projection, file format, datum, etc.
Zip
Zip
2013
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2512/index.html
2013-06
Organization
NOAA Office for Coastal Management
Bulk Download
Simple download of data files. These are in an orthometric vertical datum and differ from the datum described here.
LAZ
LAS/LAZ - LASer
Zip
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2512/supplemental/ak2008_kwf_kenai_footprint.KMZ
browse graphic
Online Resource
kmz
KMZ file showing the footprint of the area covered.
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2512/supplemental/ak2008_kwf_kenai_lidarareasmap.pdf
Area map
Online Resource
pdf
Map of the area described in this metadata.
2016-05-23
Date that the source FGDC record was last modified.
2017-11-14
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.
2018-02-08
Partial upload of Positional Accuracy fields only.
2018-03-13
Partial upload to move data access links to Distribution Info.
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.
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.
Complete
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).
1
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.
2008-06-10T00:00:00
10
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.
2013-07-01T00:00:00
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
11
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.
2022-08-29T00:00:00
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
2
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.
2008-07-28T00:00:00
3
Integrate SBET and raw laser data to produce point cloud data in LAS 1.1 format for each flight line.
2008-07-28T00:00:00
4
Compute the roll, pitch, heading, and mirror scale correction factors for each flight line, then apply corrections to the corresponding flight line.
2008-07-28T00:00:00
5
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.
2008-08-21T00:00:00
6
Manual classification of any data which appears to be bare-earth but was not properly classified using the automated methods.
2008-08-22T00:00:00
7
Create point clouds in LAS 1.1 format for all returns.
2010-01-21T00:00:00
8
Data verified using survey control points, located throughout the area.
2009-10-02T00:00:00
9
Metadata updated for Bounding coordinates, Spatial Reference info using FGDC template
2010-01-21T00:00:00
gov.noaa.nmfs.inport:49620
Anne Ball
2017-11-15T15:21:14
SysAdmin InPortAdmin
2023-10-17T16:12:16
2022-03-16
OCM Partners
OCMP
1002
Public
No
2022-03-16
1 Year
2023-03-16