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Short Citation:
OCM Partners, 2023: 2016 USGS Lidar: Yukon - Kuskokwim River Delta, AK, https://www.fisheries.noaa.gov/inport/item/52375.

Item Identification

Title: 2016 USGS Lidar: Yukon - Kuskokwim River Delta, AK
Short Name: ak2016_yukon_kuskokwim_m8502_metadata
Status: Completed
Publication Date: 2017-04-15
Abstract:

Product: These lidar data are processed Classified LAS 1.4 files, formatted to 4877 individual 1000 m x 1000 m tiles; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary.

Geographic Extent: AOI is located in the Yukon-Kuskokwim River delta between the communities of Chevak and Newtok in Western Alaska. Additional satellite areas of interest are located neat the communities of Emmonak, Scammon Bay, and Mekoryuk Alaska. The areas of interest covers approximately 1,650 square miles. Dataset Description: AK Yukon-Kuskokwim Lidar 2016 project called for the Planning, Acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.7 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2. The data was developed based on a horizontal projection/datum of NAD83, Universal Transverse Mercator, meters and vertical datum of NAVD88 (GEOID12B), meters. Lidar data was delivered as flightline-extent unclassified LAS swaths, as processed Classified LAS 1.4 files, formatted to 4877 individual 1000 m x 1000 m tiles as tiled Intensity Imagery, and as tiled bare earth DEMs; all tiled to the same 1000 m x 1000 m schema. Please note that delivery tiles 03VVH800710 and 03VWH110340 do not contain lidar points. The data boundary minimally intersects these tiles and a hydro breakline was digitized and subsequent DEM and Intensities TIFs were generated. There is no LAS 1.4 for tiles 03VVH800710 and 03VWH110340. The DEM IMG/Intensity tiff file count is 4879. The LAS 1.4 count is 4877.

Ground Conditions: Lidar was collected in late 2016 by Kodiak Mapping of Palmer Alaska , while no snow was on the ground and rivers were at or below normal levels. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, Kodiak Mapping established a total of 94 ground control points that were used to calibrate the lidar to known ground locations established throughout the project area. An additional 165 independent accuracy checkpoints, 117 in Bare Earth and Urban landcovers (117 NVA points), 48 in Tall Grass and Brushland/Low Trees categories (48 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.

The NOAA Office for Coastal Management (OCM) downloaded this lidar data from the USGS site: ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/NED/LPC/Projects/USGS_LPC_AK_Yukon_Kuskokwim_2016_LAS_2017/ and processed the data to be available on the Digital Coast Data Access Viewer (DAV).

In addition to these lidar point data, the bare earth Digital Elevation Models (DEM) created from the lidar point data are also available. These data are are available for custom download at the link provided in the URL section of this metadata record.

Breakline data are also available. These data are are available for download at the link provided in the URL section of this metadata record. These products have not been reviewed by the NOAA Office for Coastal Management (OCM) and any conclusions drawn from the analysis of this information are not the responsibility of NOAA or OCM.

Purpose:

The massive Yukon-Kuskokwim River Delta (the delta) in western Alaska is one of the flattest and most vulnerable regions in Alaska. The delta is roughly 50,000 mi2 and is home to 35+ villages including some of the most imperiled communities in Alaska. The delta is highly vulnerable to coastal flooding associated with storm surges due to its shallow bathymetry, orientation, and low relief. This LIDAR data will be used for many purposes but the primary need is to create digital elevation maps that can meet the needs of emergency response planning, community planning for trails and future infrastructure, and of the resource managers managing this critical habitat. A partnership of six State and Federal entities (U.S. Fish & Wildlife Service; Federal Emergency Management Agency, Natural Resources Conservation Service, Alaska Ocean Observing System, Alaska Division of Geological and Geophysical Service, and the Western Alaska Landscape Conservation Cooperative), combined their resources with the U.S. Geological Survey to obtain LIDAR data for seven rural communities and a large section of critical waterbird habitat. Rural communities covered by the LIDAR acquisition include Emmonak, Scammon Bay, Hooper Bay, Chevak, Mekoryuk, Newtok and the new village site of Mertarvik. The LIDAR data was collected to such that data for immediate coastal areas were acquired at or below mean high tide to improve tidal coordination. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create Intensity Images, Breaklines and Raster DEM. The purpose of these lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 1 meter cell size. These raw lidar point cloud data were used to create classified lidar LAS files, intensity images, 3D breaklines, hydro-flattened DEMs as necessary.

Supplemental Information:

USGS Contract No. G10PC00057 CONTRACTOR: WoolpertInc. SUBCONTRACTOR: Kodiak Mapping Inc. Lidar data were acquired, calibrated, and filtered to bare earth Kodiak Mapping Inc. All follow-on processing was completed by the prime contractor.

The following are the USGS lidar fields in JSON:

{

"ldrinfo" : {

"ldrspec" : "USGS-NGP Base Lidar Specification v1.2",

"ldrsens" : "Riegl LMS Q780",

"ldrmaxnr" : "7",

"ldrnps" : "0.7",

"ldrdens" : "2",

"ldranps" : "0.7",

"ldradens" : "2",

"ldrfltht" : "2100",

"ldrfltsp" : "110",

"ldrscana" : "60",

"ldrscanr" : "variable",

"ldrpulsr" : "500",

"ldrpulsd" : "3",

"ldrpulsw" : "1.2",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.25",

"ldrswatw" : "2200",

"ldrswato" : "50",

"ldrcrs" : "NAD 1983 UTM Zone 3N Meters",

"ldrgeoid" : "National Geodetic Survey (NGS) Geoid12B"

},

"ldraccur" : {

"ldrchacc" : "0.358",

"rawnva" : "0.086",

"rawnvan" : "117",

"clsnva" : "0.086",

"clsvva" : "0.167",

"vvan" : "48"

},

"lasinfo" : {

"lasver" : "1.4",

"lasprf" : "6",

"laswheld" : "Withheld (ignore) points were identified in these files using the standard LAS Withheld bit.",

"lasolap" : "Swath "overage" points were identified in these files using the standard LAS overlap bit.",

"lasintr" : "16",

"lasclass" : {

"clascode" : "1",

"clasitem" : "Processed, but Unclassified"

},

"lasclass" : {

"clascode" : "2",

"clasitem" : "Bare Earth Ground"

},

"lasclass" : {

"clascode" : "7",

"clasitem" : "Noise"

},

"lasclass" : {

"clascode" : "9",

"clasitem" : "Water"

},

"lasclass" : {

"clascode" : "10",

"clasitem" : "Ignored Ground"

},

"lasclass" : {

"clascode" : "17",

"clasitem" : "Bridge Decks"

},

"lasclass" : {

"clascode" : "18",

"clasitem" : "High Noise"

}

}}

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 beach
None erosion

Spatial Keywords

Thesaurus Keyword
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

Instrument Keywords

Thesaurus Keyword
UNCONTROLLED
Global Change Master Directory (GCMD) Instrument Keywords Earth Remote Sensing Instruments > Active Remote Sensing > Profilers/Sounders > Lidar/Laser Sounders > 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
Maintenance Frequency: None Planned
Data Presentation Form: Lidar point cloud (Digital)
Distribution Liability:

Woolpert prepared the original data as set forth in the Scope of Services, in accordance with reasonable care and due diligence as set forth in this Agreement, however, due to the easily alterable nature of electronic media, files, documents, and other deliverables, Woolpert, Inc. makes no warranties, either expressed or implied, with respect to the accuracy, completeness, merchantability, or fitness for any particular purpose, including, but not limited to, use of any/all data as described within this metadata file, by any user of this data. Any use will be at the end-user’s sole risk.

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

Data Set Credit: Woolpert Inc, USGS

Support Roles

Data Steward

CC ID: 751078
Date Effective From: 2018
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: 751079
Date Effective From: 2018
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: 751080
Date Effective From: 2018
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: 751081
Date Effective From: 2018
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: 1141042
W° Bound: -166.510288
E° Bound: -164.341632
N° Bound: 62.838234
S° Bound: 60.34131

Extent Group 1 / Time Frame 1

CC ID: 1141041
Time Frame Type: Range
Start: 2016-08-30
End: 2016-10-16
Description:

Aug 30, 31, Sept 1, 2, Oct 14, 15, 16, 2016

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for custom and bulk downloads.

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: 751085
Start Date: 2018
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8502
Distributor:
File Name: Customized Download
Description:

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

Compression: Zip

Distribution 2

CC ID: 751086
Start Date: 2018
End Date: Present
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8502/index.html
Distributor:
File Name: Bulk Download
Description:

Bulk download of data files in LAZ format, geographic coordinates, orthometric heights.

File Type: LAZ

URLs

URL 1

CC ID: 751074
URL: https://coast.noaa.gov/
Name: NOAA's Office for Coastal Management (OCM) website
URL Type:
Online Resource
File Resource Format: HTML
Description:

Information on the NOAA Office for Coastal Management (OCM)

URL 2

CC ID: 751075
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 3

CC ID: 751076
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8502/supplemental/ak2016_yukon_kuskokwim_m8502.kmz
Name: Browse graphic
URL Type:
Browse Graphic
File Resource Format: KML
Description:

This graphic displays the footprint for this lidar data set.

URL 4

CC ID: 751077
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8502/supplemental/ak2016_yukon_kuskokwim_m8502_lidar_report.pdf
Name: Dataset report
URL Type:
Online Resource
File Resource Format: PDF
Description:

Link to data set report.

URL 5

CC ID: 751113
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8502/supplemental/ak2016_yukon_kuskokwim_m8502_survey_report.pdf
Name: Survey report
URL Type:
Online Resource
Description:

Link to the survey report.

URL 6

CC ID: 751114
URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8503
URL Type:
Online Resource
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 7

CC ID: 751115
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8502/breaklines/index.html
Name: Breaklines
Description:

Link to download the breakline data.

Data Quality

Horizontal Positional Accuracy:

Not Provided

Vertical Positional Accuracy:

LAS Swath Non-Vegetated Vertical Accuracy (NVA) Tested 0.076 Meters Non vegetated vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using (RMSEz) x 1.96000 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported against 117 NVA points using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the TIN using ground lidar points.

Vegetated Vertical Accuracy (VVA) Tested 0.167 Meters at the 95th percentile reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the DEM using 48 VVA points.

Completeness Report:

These LAS data files include all data points collected. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist. The raw point cloud is of good quality and data passes Non-Vegetated Vertical Accuracy specifications.

Conceptual Consistency:

Data covers the entire area specified for this project.

Lineage

Process Steps

Process Step 1

CC ID: 1141038
Description:

LAS Point Classification: The point classification is performed as described below. The bare earth surface is then manually reviewed to ensure correct classification on the Class 2 (Ground) points. After the bare-earth surface is finalized, it is then used to generate all hydro-breaklines through a semi-automated process. All ground (ASPRS Class 2) lidar data inside of the Lake Pond and Double Line Drain hydro flattening breaklines were then classified to water (ASPRS Class 9) using TerraScan/LP360 macro functionality. A buffer of 2.3 feet was also used around each hydro-flattened feature to classify these ground (ASPRS Class 2) points to Ignored ground (ASPRS Class 10). All Lake Pond Island and Double Line Drain Island features were checked to ensure that the ground (ASPRS Class 2) points were reclassified to the correct classification after the automated classification was completed. All overlap data was processed through automated functionality provided by TerraScan to classify the overlapping flight line data to approved classes by USGS. The overlap data was classified using standard LAS overlap bit. These classes were created through automated processes only and were not verified for classification accuracy. Due to software limitations within TerraScan, these classes were used to trip the withheld bit within various software packages. These processes were reviewed and accepted by USGS through numerous conference calls and pilot study areas. All data was manually reviewed and any remaining artifacts removed using functionality provided by TerraScan and TerraModeler. Global Mapper us used as a final check of the bare earth dataset. GeoCue was then used to create the deliverable industry-standard LAS files for both the All Point Cloud Data and the Bare Earth. Woolpert Inc. proprietary software and LP360 was used to perform final statistical analysis of the classes in the LAS files, on a per tile level to verify final classification metrics and full LAS header information.

Process Date/Time: 2016-08-30 00:00:00

Process Step 2

CC ID: 1141039
Description:

The NOAA Office for Coastal Management (OCM) downloaded 4877 laz files from the USGS rockyftp site. The files contained elevation and intensity measurements for the Yukon - Kuskokwim River Delta in Alaska. The data were in UTM Zone 3 North coordinates and NAVD88 (Geoid12B) elevations in meters. The data were classified as: 1 -Unclassified, 2 - Ground, 7 - Low Noise, 9 - Water, 10 - Ignored Ground, 17- Bridge Deck, 18 - High Noise. The NOAA Office for Coastal Management processed all classifications of points to the Digital Coast Data Access Viewer (DAV). Classes available on the DAV are: 1, 2, 7, 9, 10, 17, 18.

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

1. The LAStools software scripts lasinfo and lasvalidate were run on the laz files to check for errors.

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

3. Internal OCM scripts were run on the laz files to convert from orthometric (NAVD88) elevations to ellipsoid elevations using the Geoid 12B model, to convert from UTM Zone 3 coordinates to geographic coordinates, to assign the geokeys, to sort the data by gps time and zip the data to database and to http.

Process Date/Time: 2018-03-28 00:00:00
Process Contact: Office for Coastal Management (OCM)

Catalog Details

Catalog Item ID: 52375
GUID: gov.noaa.nmfs.inport:52375
Metadata Record Created By: Rebecca Mataosky
Metadata Record Created: 2018-04-13 13:02+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-02-21 18:41+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