Search Help Show/Hide Menu
Summary
Item Identification
Keywords
Physical Location
Data Set Info
Support Roles
Extents
Spatial Info
Access Info
Distribution Info
URLs
Data Quality
Data Management
Lineage
Related Items
Catalog Details

Summary

Browse Graphic

Short Citation
OCM Partners, 2025: 2021 USACE NCMP Topobathy Lidar: Alaska, https://www.fisheries.noaa.gov/inport/item/73828.
Full Citation Examples

Abstract

Original Data: These files contain classified topo/bathy lidar data generated from data collected by the Coastal Zone Mapping and Imaging Lidar (CZMIL) system. CZMIL integrates a lidar sensor with simultaneous topographic and bathymetric capabilities, a digital camera and a hyperspectral imager on a single remote sensing platform for use in coastal mapping and charting activities. Native lidar data is not generally in a format accessible to most Geographic Information Systems (GIS). Specialized in-house and commercial software packages are used to process the native lidar data into 3-dimensional positions that can be imported into GIS software for visualization and further analysis.

The data were provided to the NOAA Office for Coastal Management (OCM) by the USACE Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) to make the data publicly available for bulk and custom downloads from the NOAA Digital Data Access Viewer (DAV). The original data's horizontal positions were provided in decimal degrees of latitude and longitude, referenced to the North American Datum of 1983 National Adjustment of 2011 (NAD83 (2011)). Vertical positions were referenced to the NAD83 (2011) ellipsoid and provided in meters. The 3-D position data were sub-divided into a series of LAS files, which are tiled into 1-km by 1-km boxes defined by the Military Grid Reference System.

In addition to the lidar point data, the topobathy bare earth Digital Elevation Models (DEMs) at a 1 meter grid spacing, created from the lidar point data, are also available from the NOAA Digital Coast Data Access Viewer (DAV). A link to the bare earth 1 meter DEM data is provided in the URL section of this metadata record. DEMs at a 1 meter grid spacing, created from all classifications, are available by request at coastal.info@noaa.gov.

Distribution Information

  • Not Applicable

    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. Change to an orthometric vertical datum is one of the many options.

  • LAS/LAZ - LASer

    Bulk download of data files in LAZ format, geographic coordinates, orthometric heights. Note that the vertical datum (hence elevations) of the files here are different than described in this document. They will be in an orthometric datum.

Access Constraints:

None

Use Constraints:

These data depict the heights at the time of the survey and are only accurate for that time. Acknowledgement of the Joint Airborne Lidar Bathymetry Technical Center of eXpertise (JALBTCX) would be appreciated in any publications or derived products. The data herein, including but not limited to geographic data, tabular data, analytical data, electronic data structures or files, are provided "as is" without warranty of any kind, either expressed or implied, or statutory, including, but not limited to, the implied warranties or merchantability and fitness for a particular purpose. The entire risk as to the quality and performance of the data is assumed by the user. No guarantee of accuracy is granted, nor is any responsibility for reliance thereon assumed. In no event shall the U.S. Army Corps of Engineers, Mobile District Office, Spatial Data Branch be liable for direct, indirect, incidental, consequential or special damages of any kind, including, but not limited to, loss of anticipated profits or benefits arising out of use of or reliance on the data. The Spatial Data Branch does not accept liability for any damages or misrepresentation caused by inaccuracies in the data or as a result of changes to the data caused by system transfers or other transformations or conversions, nor is there responsibility assumed to maintain the data in any manner or form.

These data have been developed from the best available sources. Although efforts have been made to ensure that the data are accurate and reliable, errors and variable conditions originating from physical sources used to develop the data may be reflected in the data supplied. Users must be aware of these conditions and bear responsibility for the appropriate use of the information with respect to possible errors, scale, resolution, rectification, positional accuracy, development methodology, time period, environmental and climatic conditions and other circumstances specific to these data. The user is responsible for understanding the accuracy limitations of the data provided herein. The burden for determining fitness for use lies entirely with the user. The user should refer to the accompanying metadata notes for a description of the data and data development procedures.

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.

Controlled Theme Keywords

COASTAL BATHYMETRY, 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

-171.8° W, -132.3° E, 71.4° N, 47.350823° S

Small areas of collection along the Alaska coastline.

Time Frame 1
2021-05-30

Date of collection for Block 21220 Ninilchik

Time Frame 2
2021-08-20

Date of collection for Block 21204 Elson

Time Frame 3
2021-08-03

First date of collection for Block 21209 Point Hope

Time Frame 4
2021-08-19

Last date of collection for Block 21209 Point Hope

Time Frame 5
2021-06-27

Date of collection for Block 21210 Kivalina

Time Frame 6
2021-08-04

Date of collection for Block 21215 Gambell

Time Frame 7
2021-08-04

Date of collection for Block 21216 Savoonga

Time Frame 8
2021-06-01

Date of collection for Block 21217 Nome

Time Frame 9
2021-06-01

Date of collection for Block 21218 Elim

Time Frame 10
2021-05-31

Date of collection for Block 21219 Shaktoolik

Time Frame 11
2021-05-30

Date of collection for Block 21221 Homer

Time Frame 12
2021-06-04

Date of collection for Block 21225 Cold Bay

Time Frame 13
2021-06-04

Date of collection for Block 21226 Cold Bay

Time Frame 14
2021-06-04

Date of collection for Block 21227 Akun

Time Frame 15
2021-06-09

Date of collection for Block 21251 Gustavus

Time Frame 16
2021-06-11

Date of collection for Block 21252 Hoonah

Time Frame 17
2021-06-12

Date of collection for Block 21253 Tenakee

Time Frame 18
2021-06-11

Date of collection for Block 21254 Angoon

Time Frame 19
2021-06-16

Date of collection for Block 21261 Klawock

Time Frame 20
2021-06-16

Date of collection for Block 21262 Craig

Time Frame 21
2021-06-12

Date of collection for Block 21263 Thorne Bay

Time Frame 22
2021-06-12

Date of collection for Block 21264 Kasaan

Time Frame 23
2021-06-16

Date of collection for Block 21265 Hydaburg

Time Frame 24
2021-08-20

Date of collection for Block 21205 Utkiagvik

Time Frame 25
2021-08-20

Date of collection for Block 21206 Wainwright

Time Frame 26
2021-08-19

Date of collection for Block 21207 Point Lay

Time Frame 27
2021-08-03

First date of collection for Block 21208 Point Hope

Time Frame 28
2021-08-19

Last date of collection for Block 21208 Point Hope

Time Frame 29
2021-06-22

Date of collection for Block 21211 Cape Blossom

Time Frame 30
2021-06-22

Date of collection for Block 21212 Cape Blossom

Time Frame 31
2021-08-25

Date of collection for Block 21213 Shishmaref

Time Frame 32
2021-06-11

Date of collection for Block 21255 Kake

Time Frame 33
2021-06-13

Date of collection for Block 21256 Petersburg

Time Frame 34
2021-06-13

Date of collection for Block 21257 Wrangell

Time Frame 35
2021-06-13

Date of collection for Block 21258 Whale Pass

Time Frame 36
2021-06-12

Date of collection for Block 21259 Coffman

Time Frame 37
2021-06-14

Date of collection for Block 21260 Naukati

Time Frame 38
2021-08-13

Date of collection for Block 21201 Kaktovik

Time Frame 39
2021-06-01

Date of collection for Block 21228 Unalakleet

Item Identification

Title: 2021 USACE NCMP Topobathy Lidar: Alaska
Status: Completed
Creation Date: 2021
Publication Date: 2024
Abstract:

Original Data: These files contain classified topo/bathy lidar data generated from data collected by the Coastal Zone Mapping and Imaging Lidar (CZMIL) system. CZMIL integrates a lidar sensor with simultaneous topographic and bathymetric capabilities, a digital camera and a hyperspectral imager on a single remote sensing platform for use in coastal mapping and charting activities. Native lidar data is not generally in a format accessible to most Geographic Information Systems (GIS). Specialized in-house and commercial software packages are used to process the native lidar data into 3-dimensional positions that can be imported into GIS software for visualization and further analysis.

The data were provided to the NOAA Office for Coastal Management (OCM) by the USACE Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) to make the data publicly available for bulk and custom downloads from the NOAA Digital Data Access Viewer (DAV). The original data's horizontal positions were provided in decimal degrees of latitude and longitude, referenced to the North American Datum of 1983 National Adjustment of 2011 (NAD83 (2011)). Vertical positions were referenced to the NAD83 (2011) ellipsoid and provided in meters. The 3-D position data were sub-divided into a series of LAS files, which are tiled into 1-km by 1-km boxes defined by the Military Grid Reference System.

In addition to the lidar point data, the topobathy bare earth Digital Elevation Models (DEMs) at a 1 meter grid spacing, created from the lidar point data, are also available from the NOAA Digital Coast Data Access Viewer (DAV). A link to the bare earth 1 meter DEM data is provided in the URL section of this metadata record. DEMs at a 1 meter grid spacing, created from all classifications, are available by request at coastal.info@noaa.gov.

Purpose:

This data was collected by the USACE in support of the National Coastal Mapping Program to assess changes in elevation above and below water along the coast of AK.

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 > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY > COASTAL BATHYMETRY
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
ISO 19115 Topic Category
elevation

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 > ALASKA
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > LAND SURFACE
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > SEA FLOOR

Instrument Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Instrument Keywords
LIDAR > Light Detection and Ranging

Platform Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Platform Keywords
Airplane > Airplane

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
Data Presentation Form: Model (digital)
Distribution Liability:

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

Data Set Credit: Acknowledgement of the Joint Airborne Lidar Bathymetry Technical Center of eXpertise (JALBTCX) would be appreciated in any publications or derived products.

Support Roles

Data Steward

CC ID: 1352952
Date Effective From: 2024
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: 1352951
Date Effective From: 2024
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: 1352953
Date Effective From: 2024
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: 1352954
Date Effective From: 2024
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: 1352972
W° Bound: -171.8
E° Bound: -132.3
N° Bound: 71.4
S° Bound: 47.350823
Description

Small areas of collection along the Alaska coastline.

Extent Group 1 / Time Frame 1

CC ID: 1353011
Time Frame Type: Discrete
Start: 2021-05-30
Description:

Date of collection for Block 21220 Ninilchik

Extent Group 1 / Time Frame 2

CC ID: 1352974
Time Frame Type: Discrete
Start: 2021-08-20
Description:

Date of collection for Block 21204 Elson

Extent Group 1 / Time Frame 3

CC ID: 1352980
Time Frame Type: Discrete
Start: 2021-08-03
Description:

First date of collection for Block 21209 Point Hope

Extent Group 1 / Time Frame 4

CC ID: 1352981
Time Frame Type: Discrete
Start: 2021-08-19
Description:

Last date of collection for Block 21209 Point Hope

Extent Group 1 / Time Frame 5

CC ID: 1352982
Time Frame Type: Discrete
Start: 2021-06-27
Description:

Date of collection for Block 21210 Kivalina

Extent Group 1 / Time Frame 6

CC ID: 1352986
Time Frame Type: Discrete
Start: 2021-08-04
Description:

Date of collection for Block 21215 Gambell

Extent Group 1 / Time Frame 7

CC ID: 1352987
Time Frame Type: Discrete
Start: 2021-08-04
Description:

Date of collection for Block 21216 Savoonga

Extent Group 1 / Time Frame 8

CC ID: 1352988
Time Frame Type: Discrete
Start: 2021-06-01
Description:

Date of collection for Block 21217 Nome

Extent Group 1 / Time Frame 9

CC ID: 1352989
Time Frame Type: Discrete
Start: 2021-06-01
Description:

Date of collection for Block 21218 Elim

Extent Group 1 / Time Frame 10

CC ID: 1352990
Time Frame Type: Discrete
Start: 2021-05-31
Description:

Date of collection for Block 21219 Shaktoolik

Extent Group 1 / Time Frame 11

CC ID: 1352991
Time Frame Type: Discrete
Start: 2021-05-30
Description:

Date of collection for Block 21221 Homer

Extent Group 1 / Time Frame 12

CC ID: 1352992
Time Frame Type: Discrete
Start: 2021-06-04
Description:

Date of collection for Block 21225 Cold Bay

Extent Group 1 / Time Frame 13

CC ID: 1352993
Time Frame Type: Discrete
Start: 2021-06-04
Description:

Date of collection for Block 21226 Cold Bay

Extent Group 1 / Time Frame 14

CC ID: 1352994
Time Frame Type: Discrete
Start: 2021-06-04
Description:

Date of collection for Block 21227 Akun

Extent Group 1 / Time Frame 15

CC ID: 1352996
Time Frame Type: Discrete
Start: 2021-06-09
Description:

Date of collection for Block 21251 Gustavus

Extent Group 1 / Time Frame 16

CC ID: 1352997
Time Frame Type: Discrete
Start: 2021-06-11
Description:

Date of collection for Block 21252 Hoonah

Extent Group 1 / Time Frame 17

CC ID: 1352998
Time Frame Type: Discrete
Start: 2021-06-12
Description:

Date of collection for Block 21253 Tenakee

Extent Group 1 / Time Frame 18

CC ID: 1352999
Time Frame Type: Discrete
Start: 2021-06-11
Description:

Date of collection for Block 21254 Angoon

Extent Group 1 / Time Frame 19

CC ID: 1353006
Time Frame Type: Discrete
Start: 2021-06-16
Description:

Date of collection for Block 21261 Klawock

Extent Group 1 / Time Frame 20

CC ID: 1353007
Time Frame Type: Discrete
Start: 2021-06-16
Description:

Date of collection for Block 21262 Craig

Extent Group 1 / Time Frame 21

CC ID: 1353008
Time Frame Type: Discrete
Start: 2021-06-12
Description:

Date of collection for Block 21263 Thorne Bay

Extent Group 1 / Time Frame 22

CC ID: 1353009
Time Frame Type: Discrete
Start: 2021-06-12
Description:

Date of collection for Block 21264 Kasaan

Extent Group 1 / Time Frame 23

CC ID: 1353010
Time Frame Type: Discrete
Start: 2021-06-16
Description:

Date of collection for Block 21265 Hydaburg

Extent Group 1 / Time Frame 24

CC ID: 1352975
Time Frame Type: Discrete
Start: 2021-08-20
Description:

Date of collection for Block 21205 Utkiagvik

Extent Group 1 / Time Frame 25

CC ID: 1352976
Time Frame Type: Discrete
Start: 2021-08-20
Description:

Date of collection for Block 21206 Wainwright

Extent Group 1 / Time Frame 26

CC ID: 1352977
Time Frame Type: Discrete
Start: 2021-08-19
Description:

Date of collection for Block 21207 Point Lay

Extent Group 1 / Time Frame 27

CC ID: 1352978
Time Frame Type: Discrete
Start: 2021-08-03
Description:

First date of collection for Block 21208 Point Hope

Extent Group 1 / Time Frame 28

CC ID: 1352979
Time Frame Type: Discrete
Start: 2021-08-19
Description:

Last date of collection for Block 21208 Point Hope

Extent Group 1 / Time Frame 29

CC ID: 1352983
Time Frame Type: Discrete
Start: 2021-06-22
Description:

Date of collection for Block 21211 Cape Blossom

Extent Group 1 / Time Frame 30

CC ID: 1352984
Time Frame Type: Discrete
Start: 2021-06-22
Description:

Date of collection for Block 21212 Cape Blossom

Extent Group 1 / Time Frame 31

CC ID: 1352985
Time Frame Type: Discrete
Start: 2021-08-25
Description:

Date of collection for Block 21213 Shishmaref

Extent Group 1 / Time Frame 32

CC ID: 1353000
Time Frame Type: Discrete
Start: 2021-06-11
Description:

Date of collection for Block 21255 Kake

Extent Group 1 / Time Frame 33

CC ID: 1353001
Time Frame Type: Discrete
Start: 2021-06-13
Description:

Date of collection for Block 21256 Petersburg

Extent Group 1 / Time Frame 34

CC ID: 1353002
Time Frame Type: Discrete
Start: 2021-06-13
Description:

Date of collection for Block 21257 Wrangell

Extent Group 1 / Time Frame 35

CC ID: 1353003
Time Frame Type: Discrete
Start: 2021-06-13
Description:

Date of collection for Block 21258 Whale Pass

Extent Group 1 / Time Frame 36

CC ID: 1353004
Time Frame Type: Discrete
Start: 2021-06-12
Description:

Date of collection for Block 21259 Coffman

Extent Group 1 / Time Frame 37

CC ID: 1353005
Time Frame Type: Discrete
Start: 2021-06-14
Description:

Date of collection for Block 21260 Naukati

Extent Group 1 / Time Frame 38

CC ID: 1352971
Time Frame Type: Discrete
Start: 2021-08-13
Description:

Date of collection for Block 21201 Kaktovik

Extent Group 1 / Time Frame 39

CC ID: 1352995
Time Frame Type: Discrete
Start: 2021-06-01
Description:

Date of collection for Block 21228 Unalakleet

Spatial Information

Spatial Representation

Representations Used

Grid: No
Vector: Yes
Text / Table: No
TIN: No
Stereo Model: No
Video: No

Reference Systems

Reference System 1

CC ID: 1352965

Coordinate Reference System

CRS Type: Geographic 3D
EPSG Code: EPSG:6319
EPSG Name: NAD83(2011)
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:

These data depict the heights at the time of the survey and are only accurate for that time. Acknowledgement of the Joint Airborne Lidar Bathymetry Technical Center of eXpertise (JALBTCX) would be appreciated in any publications or derived products. The data herein, including but not limited to geographic data, tabular data, analytical data, electronic data structures or files, are provided "as is" without warranty of any kind, either expressed or implied, or statutory, including, but not limited to, the implied warranties or merchantability and fitness for a particular purpose. The entire risk as to the quality and performance of the data is assumed by the user. No guarantee of accuracy is granted, nor is any responsibility for reliance thereon assumed. In no event shall the U.S. Army Corps of Engineers, Mobile District Office, Spatial Data Branch be liable for direct, indirect, incidental, consequential or special damages of any kind, including, but not limited to, loss of anticipated profits or benefits arising out of use of or reliance on the data. The Spatial Data Branch does not accept liability for any damages or misrepresentation caused by inaccuracies in the data or as a result of changes to the data caused by system transfers or other transformations or conversions, nor is there responsibility assumed to maintain the data in any manner or form.

These data have been developed from the best available sources. Although efforts have been made to ensure that the data are accurate and reliable, errors and variable conditions originating from physical sources used to develop the data may be reflected in the data supplied. Users must be aware of these conditions and bear responsibility for the appropriate use of the information with respect to possible errors, scale, resolution, rectification, positional accuracy, development methodology, time period, environmental and climatic conditions and other circumstances specific to these data. The user is responsible for understanding the accuracy limitations of the data provided herein. The burden for determining fitness for use lies entirely with the user. The user should refer to the accompanying metadata notes for a description of the data and data development procedures.

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: 1352955
Start Date: 2024
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=9702/details/9702
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2024 - 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. Change to an orthometric vertical datum is one of the many options.

Distribution Format: Not Applicable
Compression: Zip

Distribution 2

CC ID: 1352956
Start Date: 2024
End Date: Present
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/9702/index.html
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2024 - Present)
File Name: Bulk Download
Description:

Bulk download of data files in LAZ format, geographic coordinates, orthometric heights. Note that the vertical datum (hence elevations) of the files here are different than described in this document. They will be in an orthometric datum.

Distribution Format: LAS/LAZ - LASer
Compression: LAZ

URLs

URL 1

CC ID: 1352957
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: 1352958
URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=10207/details/10207
Name: Custom DEM Download
URL Type:
Online Resource
File Resource Format: Zip
Description:

Link to custom download, from the Data Access Viewer (DAV), the raster Digital Elevation Model (DEM) data that were created from this lidar data set.

URL 3

CC ID: 1352959
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/9702/supplemental/usace2021_ak_m9702.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage for the 2021 topobathy lidar acquisition along the Alaskan coast.

URL 4

CC ID: 1352960
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/entwine/geoid12b/9702/ept.json
Name: Entwine Point Tile (EPT)
URL Type:
Online Resource
File Resource Format: json
Description:

Entwine Point Tile (EPT) is a simple and flexible octree-based storage format for point cloud data. The data is organized in such a way that the data can be reasonably streamed over the internet, pulling only the points you need. EPT files can be queried to return a subset of the points that give you a representation of the area. As you zoom further in, you are requesting higher and higher densities. A dataset in EPT will contain a lot of files, however, the ept.json file describes all the rest. The EPT file can be used in Potree and QGIS to view the point cloud.

URL 5

CC ID: 1352961
URL: https://coast.noaa.gov/lidar/viewer/v/noaapotree.html?r=https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/entwine/geoid12b/9702/ept.json
Name: Potree 3D View
URL Type:
Online Resource
Description:

Link to view the point cloud (using the Entwine Point Tile (EPT) format) in the 3D Potree viewer.

Data Quality

Accuracy:

Every effort within operational constraints was made to acquire data that meets specifications as outline in this project's Statement of Work. Per flight block, elevations in areas of swath overlap are internally consistent and meet CZMIL specifications. Anomalous high and/or low elevation values have been removed, and point cloud classification algorithms have been validated via manual review and QC. Temporal differences in elevation exist in areas of active near shore processes from the dune to the depth of closure. JALBTCX conducts operations in a manner to ameliorate temporal differences, to include the collection of entire flight blocks within single missions. For a given flight block, it's adjacent flight blocks are captured within 3 days as weather and airspace permit.

Horizontal Positional Accuracy:

CZMIL topographic data - Compiled to meet 1 m horizontal accuracy at 95% confidence level. CZMIL bathymetric data - Compiled to meet 3.5 + 0.05d m horizontal accuracy at 95% confidence level, d is depth.

Vertical Positional Accuracy:

CZMIL topographic data - Compiled to meet 20 cm vertical accuracy at 95% confidence level (10 cm RMSE). CZMIL bathymetric shallow FOV data - Compiled to meet SQRT((0.25^2) +((0.0075d)^2)) m vertical accuracy at 95% confidence level, d is depth. CZMIL bathymetric deep FOV data - Compiled to meet SQRT((0.30^2) +((0.013d)^2)) m vertical accuracy at 95% confidence level, d is depth.

Completeness Measure:

Planned data coverage for this dataset includes the shoreline along the coast of AK. Lidar and imagery data acquisition was focused on a 1500 meter swath of the shoreline that generally extends from the shoreline onshore 500 meters and from the shoreline offshore to 1000 meters or laser extinction, whichever occurs first. The planned point spacing is 70 centimeters on land and in shallow water. In deeper water the planned point spacing is 2 meters. Gaps or data holidays exist in the bathymetric portion of the data coverage due to a number of operational and environmental conditions, including by not limited to, active surf, low-reflectivity bottom substrate materials and turbidity in the water column. Please see the Report of Survey for additional details.

Every effort within operational constraints was made to achieve the intended data coverage and planned point densities.

Quality Control Procedures Employed:

JALBTCX evaluates final data coverage using techniques that are common to the lidar industry. These techniques are performed in a 3D environment for visual review of the final data coverage and verification of data alongside lidar waveforms and imagery collected concurrent with the lidar. Data reviewers perform checks to verify (1) extreme high and/or low elevation values have been invalidated, (2) elevations in areas of swath overlap are internally consistent, (3) binned standard deviation values meet CZMIL specifications, (4) point cloud classifications are valid, and (5) CZMIL processing modes are valid.

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-NC
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

Data is backed up to cloud storage.

Lineage

Lineage Statement:

CZMIL data is processed from raw lidar waveforms to point clouds using the CZMIL HydroFusion software package. Point clouds are then classified and edited in industry-standard software packages. Derivative data products are generated through the application of gridding and contouring algorithms in a GIS environment. The data processing workflow, including software packages, algorithms and parameters are provided in detail, herein this metadata as Process Steps.

The NOAA Office for Coastal Management (OCM) received the data from the USACE Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX). NOAA OCM processed the data to the NOAA Digital Coast Data Access Viewer (DAV) to make the data publicly available for bulk and custom downloads.

Sources

USACE JALBTCX

CC ID: 1352966
Contact Role Type: Originator
Contact Type: Organization
Contact Name: USACE JALBTCX

Process Steps

Process Step 1

CC ID: 1352967
Description:

These data were collected using the CZMIL system. It is owned and operated by the U.S. Army Corps of Engineers (USACE). The system collects topobathy lidar data at 10 kHz and RGB imagery at 2 Hz. A CASI-1500 hyperspectral line scanner is integrated with the system as well. Aircraft position, velocity and acceleration information are collected through a combination of NovAtel and POS A/V 610 equipment. All raw data streams are transferred to the office for downloading and processing in CZMIL's HydroFusion software. Aircraft position data are processed using POSPac software and the results are combined with the lidar data to produce 3-D positions for each lidar shot. Upon inspection and QA/QC in the software packages Fledermaus and PFM_ABE, anomalous data are flagged as invalid and have the withheld bit set.

Process Date/Time: 2021-08-20 00:00:00

Process Step 2

CC ID: 1352968
Description:

LAS files are imported into TerraScan V13 module within MicroStation V8i, classifies valid topobathy data as ground points (2) and unclassified points (1), and valid bathymetric points (29). Upon completion the macro, the classification results undergo quality control and any misclassified points are manually edited. In areas of dense vegetation the bare earth ground points might be incorrectly classified due to the inability of the laser to penetrate the canopy and reach the bare ground. In these areas, JALBTCX defaults to the algorithm's ground surface instead of manually reclassifying those points. They are partitioned into a series of 1-km delivery boxes, one Classified LAS file per box. The format of the file is LAS version 1.2. Data are classified as 1 (valid non-ground topographic data), 2 (valid ground topographic data), and 29 (valid bathymetric data). The National Geodetic Survey's (NGS) GEOID12B model is used to transform the horizontal positions from UTM to Geographic coordinates referenced to the North American Datum of 1983 National Adjustment of 2011 (NAD83 2011). The files are then compressed with the open-source LASzip utility, which is part of the LAStools package (LAStools, "Efficient LiDAR Processing Software" (version 210720, licensed)), obtained from http://rapidlasso.com/LAStools.

Process Date/Time: 2024-01-08 00:00:00

Process Step 3

CC ID: 1352969
Description:

The NOAA Office for Coastal Management (OCM) received 1078 laz files from USACE JALBTCX for the Alaska coastline. The lidar data had elevation and intensity measurements. The data were in geographic (NAD83 2011) coordinates and ellipsoid elevations in meters. The data were classified as: 1 - Unclassified, 2 - Ground, 29 - Bathymetric Point. OCM processed all classifications of points to the Digital Coast Data Access Viewer (DAV). Classes available on the DAV are: 1, 2, 29.

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

1. An internal OCM script was run to check the number of points by classification and by flight ID and the gps and intensity ranges.

2. Internal OCM scripts were run on the laz files to assign the geokeys, to sort the data by gps time and zip the data to database and to AWS S3.

Process Date/Time: 2024-11-15 00:00:00
Process Contact: Office for Coastal Management (OCM)

Related Items

Item Type Relationship Type Title
Data Set (DS) Cross Reference 2021 USACE NCMP Topobathy Lidar DEM: Alaska

Catalog Details

Catalog Item ID: 73828
GUID: gov.noaa.nmfs.inport:73828
Metadata Record Created By: Rebecca Mataosky
Metadata Record Created: 2024-11-18 18:27+0000
Metadata Record Last Modified By: Rebecca Mataosky
Metadata Record Last Modified: 2024-11-22 21:42+0000
Metadata Record Published: 2024-11-19
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2023-12-21
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2024-12-21