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Short Citation:
OCM Partners, 2023: Bayfield Co. QL2 LiDAR (2015-16) - DEM, https://www.fisheries.noaa.gov/inport/item/49476.

Item Identification

Title: Bayfield Co. QL2 LiDAR (2015-16) - DEM
Short Name: wi2016_Bayfield_DEM_m6338_metadata
Status: Completed
Publication Date: 2017-07-12
Abstract:

The Bayfield County lidar project area covers approximately 1681 square miles plus a 100 meter buffer around the county boundary. The lidar data was acquired at a nominal point spacing (NPS) of 0.7 meters and a single swath nominal point density (NPD) of 2.0. Project specifications are based on Bayfield County requirements and on the U.S. Geological Survey National Geospatial Program LiDAR Base Specification, Version 1.2. The data was developed based on a horizontal projection/datum of NAD83(2011) / WISCRS Bayfield (ftUS) (EPSG code: 7590), and vertical datum of NAVD88 - Geoid12A (Feet). LiDAR data was acquired in two phases using the Orion Optech H300 sensor; the first phase from October 22, 2015 to November 08, 2015, and the second phase on April 15, 2016. Acquisition occurred with leaves absent from deciduous trees, when no snow was present on the ground, and with rivers at or below normal levels.

The data was converted to vertical meters for ingest into the Digital Coast Data Access Viewer.

Original contact information:

Contact Name: Scott Galetka

Contact Org: Bayfield County

Title: Land Records Administrator

Phone: (715) 373-6156

Email: sgaletka@bayfieldcounty.org

Purpose:

This data, along with its derivatives, is the result of a countywide elevation mapping with cooperative partnerships from Bayfield County, Wisconsin DOA, and the USGS 3DEP program. This data was produced from lidar collected in October 2015, November 2015, and April 2016, which was processed and delivered in 2016.

Notes:

12069

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > TOPOGRAPHICAL RELIEF MAPS
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
UNCONTROLLED
ISO 19115 Topic Category elevation
None 2 foot pixel
None bare earth
None DEM
None elevation
None GRID
None Hydrology
None Lidar
None raster digital data
None surface data
None surface model
None terrain data

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > WISCONSIN
UNCONTROLLED
None Bayfield County
None Wisconsin

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of Ayers Associates, the U.S. Geological Survey, the NOAA Office for Coastal Management or its partners.

Support Roles

Data Steward

CC ID: 664976
Date Effective From: 2017-07-12
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: 664978
Date Effective From: 2017-07-12
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: 664979
Date Effective From: 2017-07-12
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: 664977
Date Effective From: 2017-07-12
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: 664982
W° Bound: -91.560786
E° Bound: -90.388184
N° Bound: 47.085361
S° Bound: 46.15049

Extent Group 1 / Time Frame 1

CC ID: 664981
Time Frame Type: Range
Start: 2015-10-22
End: 2016-04-15

Access Information

Security Class: Unclassified
Data Access Procedure:

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer

;

Data Access Constraints:

No restrictions apply to these data.

Data Use Constraints:

None. However, users should be aware that temporal changes may have occurred since this dataset 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. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.

Distribution Information

Distribution 1

CC ID: 721098
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=6338
Distributor:
File Name: Customized Download
Description:

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

Distribution 2

CC ID: 721099
Download URL: https://coast.noaa.gov/htdata/raster2/elevation/WI_3DEP_Bayfield_2016_6338
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 721101
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 721102
URL: https://coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 665001
Activity Date/Time: 2017-07-06
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 665000
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: 718806
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 721100
Activity Date/Time: 2018-02-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

No formal attribute accuracy tests were conducted.

Vertical Positional Accuracy:

The project specifications require the vertical accuracy of the LiDAR data to be calculated and reported according to Non-vegetated Vertical Accuracy (NVA) and Vegetated Vertical Accuracy (VVA) classifications.

The required NVA for this project is 19.6 cm (0.643 survey feet) calculated at the 95 percent confidence level (AccuracyZ). The 95 percent confidence level statistic is derived according to National Standards for Spatial Data Accuracy (NSSDA) methodologies using RMSEz * 1.9600. This requirement is for the vertical accuracy testing of the raw swath lidar data and the derived digital elevation model (DEM). The AccuracyZ statistic is assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines. The minimum required number of NVA checkpoints for this project area is 86.

The required VVA for this project is 29.4 cm (0.965 survey feet) calculated at the 95th percentile derived according to ASPRS Guidelines, Vertical Accuracy Reporting for Lidar Data, i.e., based on the 95th percentile error in all vegetated land cover classes combined. This requirement is for the vertical accuracy testing of the derived digital elevation model (DEM). The minimum required number of VVA checkpoints for this project area is 64.

The NVA (bare earth and urban area land cover classes) and VVA (tall weeds, forested, and swamp land cover classes) checkpoints were distributed throughout the project area and were surveyed using GPS techniques. See survey report for additional survey methodologies. Elevations from the hydro flattened raster DEM were measured for the x,y location of each check point. Elevations interpolated from the hydro flattened raster DEM surface were then compared to the elevation values of the surveyed control points.; Quantitative Value: 0.109 meters, Test that produced the value: Tested 0.109 meters (0.358 survey feet) NVA at the 95 percent confidence level. The NVA of the DEM was calculated using 107 independent checkpoints located in the Bare Earth and Urban land cover categories.; Quantitative Value: 0.106 meters, Test that produced the value: Tested 0.106 meters (0.348 survey feet) NVA at the 95 percent confidence level. The NVA of the raw swath was calculated using 107 independent checkpoints located in the Bare Earth and Urban land cover categories.; Quantitative Value: 0.219 meters, Test that produced the value: Tested 0.219 meters (0.720 survey feet) VVA against the DEM at the 95th percentile. The VVA of the DEM was calculated using 64 independent checkpoints located in the tall weed, forested, and swamp land cover categories. The 95th percentile is determined by taking the absolute value of each elevation comparison between the VVA checkpoints and hydro flattened DEM, sorting the elevation values from lowest to highest, and discarding the highest 5% of the sorted elevation values. The next highest remaining value is the resultant 95th percentile value.

Completeness Report:

Spatial consistency of coverage of the Bayfield Co. QL2 LiDAR (2015-16) project area was maintained throughout the dataset.

Conceptual Consistency:

Spatial consistency of coverage of the Bayfield Co. QL2 LiDAR (2015-16) project area was maintained throughout the dataset.

Lineage

Process Steps

Process Step 1

CC ID: 664969
Description:

LiDAR processing utilizes several software packages, including GeoCue and the TerraSolid suite of processing components. The GeoCue software is a database management system for housing the LiDAR dataset (usually multiple gigabytes in size). GeoCue incorporates a thorough checklist of processing steps and quality assurance/quality control (QA/QC) procedures that assist in the LiDAR workflow. The TerraSolid software suite is used to automate the initial classification of the LiDAR point cloud based on a set of predetermined parameters. Lidar technicians refer to ground cover research (natural and cultural features) within the project area and determine algorithms most suitable for the initial automated LiDAR classification. (Some algorithms/filters recognize the ground in forests well, while others have greater capability in urban areas). During this process each point is given an initial classification (e.g., as ground, vegetation, or noise) based on the point's coordinates and the relation to its neighbors. Classifications to be assigned include all those outlined by ASPRS standards. The initial classifications produce a coarse and inexact dataset, but offer an adequate starting point for the subsequent manual classification procedure. During this step, "overlap" points are automatically classified (those originating from neighboring flightlines) using information gathered from the ABGPS and IMU data. Any duplicate points existing from adjacent flightlines are removed during this process. Hydrographic breaklines are collected using LiDARgrammetry to ensure hydroflattened water surfaces. This process involves manipulating the LiDAR data's intensity information to create a metrically sound stereo environment. From this generated "imagery", breaklines are photogrammetrically compiled. Breakline polygons are created to represent open water bodies. The LiDAR points that fall within these areas are classified as "water." All hydrographic breaklines include a 3.125 foot buffer, with the Class 2 (bare earth) points being re-classified as Class 10 (ignored ground). TerraSolid is further used for the subsequent manual classification of the LiDAR points allowing technicians to view the point cloud in a number of ways to ensure accuracy and consistency of points and uniformity of point coverage. The TIN was processed to create a GRID or digital elevation model (DEM) with 2 foot pixels.

Process Step 2

CC ID: 664970
Description:

The NOAA Office for Coastal Management received the data from the Wisconsin Department of Natural Resources in img format. The vertical coordinates were converted from feet to meters using gdal_translate.

Process Date/Time: 2017-07-05 00:00:00

Catalog Details

Catalog Item ID: 49476
GUID: gov.noaa.nmfs.inport:49476
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:13+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2018-02-13
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2018-02-13
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2019-02-13