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Item Identification
Keywords
Physical Location
Data Set Info
Support Roles
Extents
Access Info
Distribution Info
URLs
Tech Environment
Data Quality
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Catalog Details

Summary

This graphic displays the footprint for this lidar data set.

Short Citation
OCM Partners, 2024: 2015 Lidar: Municipality of Anchorage, AK, https://www.fisheries.noaa.gov/inport/item/50281.
Full Citation Examples

Abstract

The base LiDAR deliverables will conform to USGS LBS specifications V1.4 for Quality Level 2 (QL2) data.

The QL2 requires collection of 2 points per square meter (ppsm), nominal LiDAR pulse spacing of no greater

than 0.7 meter for 463 square miles and 4 PPSM for 494 sq. miles and a vertical accuracy of better than 10-cm

RMSE. (Merrick will provide data to a 9.25cm vertical accuracy in the interest of meeting a 1 foot contour

accuracy specification and this will still meet the QL2 specification).

The NOAA Office for Coastal Management (OCM) downloaded this lidar data from the USGS ftp site, processed it and made it available on the NOAA Digital Coast. In addition to this lidar point data, bare earth digital elevation model (DEM) raster and breakline data are also available. Links to these data are located in the URL section of this metadata record. The breakline data has not been reviewed by the OCM and is made available at the user's discretion .

Distribution Information

Access Constraints:

None

Use Constraints:

Users should be aware that temporal changes may have occurred since this data set was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations.

Controlled Theme Keywords

COASTAL ELEVATION, elevation, TERRAIN ELEVATION

Child Items

No Child Items for this record.

Contact Information

Point of Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202
https://coast.noaa.gov

Metadata Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202
https://coast.noaa.gov

Extents

Geographic Area 1

-150.286492° W, -148.773377° E, 61.49475° N, 60.732991° S

Time Frame 1
2015-05-10 - 2015-05-31

Item Identification

Title: 2015 Lidar: Municipality of Anchorage, AK
Short Name: ak2015_anchorage_m8406_metadata
Status: Completed
Publication Date: 2017-12-14
Abstract:

The base LiDAR deliverables will conform to USGS LBS specifications V1.4 for Quality Level 2 (QL2) data.

The QL2 requires collection of 2 points per square meter (ppsm), nominal LiDAR pulse spacing of no greater

than 0.7 meter for 463 square miles and 4 PPSM for 494 sq. miles and a vertical accuracy of better than 10-cm

RMSE. (Merrick will provide data to a 9.25cm vertical accuracy in the interest of meeting a 1 foot contour

accuracy specification and this will still meet the QL2 specification).

The NOAA Office for Coastal Management (OCM) downloaded this lidar data from the USGS ftp site, processed it and made it available on the NOAA Digital Coast. In addition to this lidar point data, bare earth digital elevation model (DEM) raster and breakline data are also available. Links to these data are located in the URL section of this metadata record. The breakline data has not been reviewed by the OCM and is made available at the user's discretion .

Purpose:

957 square miles of 2 ppsm and 4 ppsm LiDAR to USGS QL2 specifications to support the Municipality base mapping efforts.

Supplemental Information:

Fully Classified LAS formatted files

LAS 1.4 format or as required by MOA

Classification of the LiDAR point cloud in accordance with the

following classification scheme:

Class 1 = Processed, but Unclassified

Class 2 = Bare-earth Ground

Class 7 = Low point (noise)

Class 9 = Water

Class 10 = ignored ground (near a Breaklines)

Class 17 = Bridges Decks

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
ISO 19115 Topic Category
elevation
UNCONTROLLED
None Light Detection and Ranging

Temporal Keywords

Thesaurus Keyword
UNCONTROLLED
None 2015

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
Global Change Master Directory (GCMD) North America > United States > Alaska

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Elevation
Maintenance Frequency: None Planned
Data Presentation Form: Point Cloud (digital)
Entity Attribute Overview:

LAS 1.4 format or as required by MOA

Classification of the LiDAR point cloud in accordance with the following classification scheme:

Class 1 = Processed, but Unclassified

Class 2 = Bare-earth Ground

Class 7 = Low point (noise)

Class 9 = Water

Class 10 = ignored ground (near a Breaklines)

Class 17 = Bridge Decks

Entity Attribute Detail Citation:

LAS 1.4 format or as required by MOA Classification of the LiDAR point cloud in accordance with the following classification scheme: Class 1 = Processed, but Unclassified Class 2 = Bare-earth Ground Class 7 = Low point (noise) Class 9 = Water Class 10 = ignored ground (near a Breaklines) Class 17 = Bridge Decks

Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of Merrick, the Municipality of Anchorage, the NOAA Office for Coastal Management, or its partners.

Data Set Credit: Municipality of Anchorage, AK; Merrick & Co; McElhanney

Support Roles

Data Steward

CC ID: 695198
Date Effective From: 2017-11-17
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
Contact Instructions:

Telephone: 843-740-1202

Email: coastal.info@noaa.gov

Distributor

CC ID: 694314
Date Effective From: 2017-11-17
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
Contact Instructions:

Telephone: 843-740-1202

Email: coastal.info@noaa.gov

Metadata Contact

CC ID: 694315
Date Effective From: 2017-11-17
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
Contact Instructions:

Telephone: 843-740-1202

Email: coastal.info@noaa.gov

Originator

CC ID: 699484
Date Effective From: 2015-05-10
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: 694407
Date Effective From: 2017-11-17
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: 1140576
W° Bound: -150.286492
E° Bound: -148.773377
N° Bound: 61.49475
S° Bound: 60.732991

Extent Group 1 / Time Frame 1

CC ID: 1140575
Time Frame Type: Range
Start: 2015-05-10
End: 2015-05-31

Access Information

Security Class: Unclassified
Data Access Procedure:

Users may access the data from two links. Custom download and bulk download options are available.

Data Access Constraints:

None

Data Use Constraints:

Users should be aware that temporal changes may have occurred since this data set was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations.

Distribution Information

Distribution 1

CC ID: 694207
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8406
Distributor:
Description:

Link to custom download points, grids, or contours from the Data Access Viewer (DAV).

Compression: Zip

Distribution 2

CC ID: 694218
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8406/index.html
Distributor:
Description:

Link to bulk download laz files in geographic coordinates and elevations in NAVD88 meters .

URLs

URL 1

CC ID: 694206
URL: https://coast.noaa.gov/htdata/lidar2_z/geoid12b/data/8406/supplemental/ak2015_anchorage_m8406.kmz
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic displays the footprint for this lidar data set.

URL 2

CC ID: 694219
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8406/supplemental/ak2015_anchorage_m8406_lidar_report.pdf
URL Type:
Other
File Resource Format: pdf
Description:

This lidar report provides accompanying information about the collection and processing of this lidar data set.

URL 3

CC ID: 695196
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8406/supplemental/ak2015_anchorage_m8406_qc_report.pdf
URL Type:
Other
File Resource Format: pdf
Description:

This QC report provides accompanying information about the quality of this lidar data set.

URL 4

CC ID: 695203
URL: https://coast.noaa.gov/dataviewer
URL Type:
Other
Description:

Link to the Digital Coast Data Access Viewer (DAV) where elevation, imagery, and land cover data are available for free, custom download.

URL 5

CC ID: 695204
URL: https://coast.noaa.gov/dataregistry
URL Type:
Other
Description:

Link to the Digital Coast Data Registry where many types of coastal data are available for free download.

URL 6

CC ID: 695205
URL: https://coast.noaa.gov/
URL Type:
Other
Description:

Link to the NOAA Office for Coastal Management (OCM) homepage.

URL 7

CC ID: 695985
URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8431
URL Type:
Other
Description:

Link to custom download the raster Digital Elevation Model (DEM) data from the Data Access Viewer (DAV).

URL 8

CC ID: 695986
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8406/breaklines/index.html
URL Type:
Other
Description:

Link to download the breakline data.

Technical Environment

Description:

Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095

Data Quality

Horizontal Positional Accuracy:

This data set was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 42.98 cm RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy = +/- 74.68 cm at a 95% confidence level.

Vertical Positional Accuracy:

This data set was tested to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10.0-cm RMSEz Vertical Accuracy Class. Actual NVA accuracy (55 NVA check points) was found to be RMSEz = 6.965 cm, equating to +/- 13.651 cm at the 95% confidence level. Actual VVA accuracy (45 VVA check points) was found to be +/- 15.180 cm at the 95th percentile.

Completeness Report:

This dataset contains unclassified returns of the LIDAR sensor. The sensor data was verified in MARS software to ensure complete coverage.

Conceptual Consistency:

Calibrations of the LIDAR flightline data are performed; this process is known as boresighting. The flightlines are compared to evaluate both their relative and absolute accuracies.

Lineage

Sources

Ground Control

CC ID: 1140569
Publish Date: 2015-01-01
Extent Type: Discrete
Extent Start Date/Time: 2015

Lidar

CC ID: 1140570
Publish Date: 2016-11-29
Extent Type: Range
Extent Start Date/Time: 2015-05-10
Extent End Date/Time: 2016-09-29

Process Steps

Process Step 1

CC ID: 1140572
Description:

LIDAR data was collected using McElhanney's ALS70 HP LIDAR sensor. The raw data was verified in MARS software for complete coverage of the project area, and boresighted to align the flightlines. Raw data files were parsed into manageable client-specific tiles. These tiles were then processed through automated filtering that separates the data into different classification groups: unclassified points, ground points, low points, water, ignored ground, Bridge Decks and Culverts. The data was next taken into MARS to reclassify the erroneous points that may remain in the LIDAR point cloud after auto filter.

Process Date/Time: 2016-11-29 00:00:00

Process Step 2

CC ID: 1140573
Description:

The NOAA Office for Coastal Management (OCM) downloaded the data in laz format from the USGS site on Nov 2, 2017 (ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/NED/LPC/projects/USGS_LPC_AK_Anchorage_2015_LAS_2017/) . The files contained lidar elevation and intensity measurements. The data were in UTM Zone 6 (NAD83) meters coordinates and NAVD88 (Geoid12a) elevations in meters. OCM did the following processing to the data for Digital Coast storage and provisioning purposes:

1. File names were changed to remove USGS_LPC_2017 and _LAS_2017 from the filenames.

2. Converted from UTM Zone 6 (NAD83) meters coordinates to geographic coordinates

3. Converted from NAVD88 elevations to NAD83(2011) ellipsoid elevations using Geoid12a grids

4. Copied the laz files to database and https

Process Date/Time: 2017-11-15 00:00:00
Process Contact: Office for Coastal Management (OCM)
Source: Lidar

Catalog Details

Catalog Item ID: 50281
GUID: gov.noaa.nmfs.inport:50281
Metadata Record Created By: Rebecca Mataosky
Metadata Record Created: 2017-11-17 10:27+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-08-15 17:09+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