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LiDAR Elevation Data (QL1 and QL2): Ashland County, WI 2019

Identification Information

Citation
Title
LiDAR Elevation Data (QL1 and QL2): Ashland County, WI 2019
Originator
U.S. Geological Survey
Publication Date
2021-05-04
Edition
2019
Geospatial Data Presentation Form
mapDigital
Collection Title
Wisconsin Elevation Data, Coastal
Abstract
This data represents QL1 and QL2 LiDAR elevation information for Ashland County, WI in 2019. The following derivative products are available: classified LAS, hydro breaklines, tiled DEM, a tiled DSM, and intensity images. QL1 refers to higher resolution data, with 8 points per square meter. QL2 refers to lower resolution data, with 2 points per square meter. [QL1 Description: Classified LAS 1.4 files, formatted to 5010 individual 2500 ft x 2500 ft tiles; used to create intensity images, 3D breaklines, and hydro-flattened DEMs as necessary. Digital Surface Model (DSM) data for Wisconsin as part of the required deliverables for the WI AshlandIronFlorence - Ashland QL1 Lidar, Work Package 183663, Work Unit 183715 project. First return lidar points were used to create a 2 foot raster DSM; Digital Elevation Model (DEM) data for Wisconsin as part of the required deliverables for the WI AshlandIronFlorence - Ashland QL1 Lidar, Work Package 183663, Work Unit 183715 project. Class 2 (ground) LiDAR points in conjunction with the hydro breaklines were used to create a 2 foot hydro-flattened Raster DEM; Breakline data is used to hydroflatten the DEMs created for the WI AshlandIronFlorence - Ashland QL1 Lidar, Work Package 183663, Work Unit 183715 project. Breaklines are reviewed against LiDAR intensity imagery to verify completeness of capture. QL1 Geographic Extent: 5 counties in Wisconsin, covering approximately 1065 total square miles. QL2 Geographic Extent: 1 counties in Wisconsin, covering approximately 111 total square miles. QL1 Dataset Description: The WI AshlandIronFlorence - Ashland QL1 Lidar, Work Package 183663, Work Unit 183715 project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.35 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, Version 1.3. The data were developed based on a horizontal projection/datum of NAD 1983 2011 WISCRS Ashland Feet, Foot US and vertical datum of NAVD88 Geoid 12b, Foot US. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to 5010 individual 2500 ft x 2500 ft tiles, as tiled intensity imagery, and as tiled bare earth DEMs; all tiled to the same 2500 ft x 2500 ft schema. Continuous breaklines were produced in Esri file geodatabase format. Ground Conditions: LiDAR was collected in fall 2019, 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, Quantum Spatial, Inc. utilized a total of 0 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 0 independent accuracy checkpoints, 0 in Bare Earth and Urban landcovers (0 NVA points), 0 in Tall Weeds categories (0 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data. QL2 Dataset Description: These lidar data are processed Classified LAS 1.4 files, formatted to 702 individual 2500 ft x 2500 ft tiles; used to create intensity images, 3D breaklines, and hydro-flattened DEMs as necessary. Digital Surface Model (DSM) data for Wisconsin as part of the required deliverables for the WI AshlandIronFlorence - Ashland QL1 Lidar, Work Package 183663, Work Unit 183715 project. First return lidar points were used to create a 2 foot raster DSM; Digital Elevation Model (DEM) data for Wisconsin as part of the required deliverables for the WI AshlandIronFlorence - Ashland QL1 Lidar, Work Package 183663, Work Unit 183715 project. Class 2 (ground) LiDAR points in conjunction with the hydro breaklines were used to create a 2 foot hydro-flattened Raster DEM; Breakline data is used to hydroflatten the DEMs created for the WI AshlandIronFlorence - Ashland QL1 Lidar, Work Package 183663, Work Unit 183715 project. Breaklines are reviewed against LiDAR intensity imagery to verify completeness of capture.Geographic Extent: 1 counties in Wisconsin, covering approximately 111 total square miles. Ql1 and QL2 Ground Conditions: LiDAR was collected in spring 2020, 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, Quantum Spatial, Inc. utilized a total of 20 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 46 independent accuracy checkpoints, 26 in Bare Earth and Urban landcovers (26 NVA points), 20 in Tall Weeds categories (20 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.]
Purpose
This data is intended for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. [To acquire detailed surface elevation data for use in conservation planning, design, research, floodplain mapping, dam safety assessments and elevation modeling, etc. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create intensity images, breaklines and raster DEMs. The purpose of these LiDAR data was to produce high accuracy 3D hydro-flattened digital elevation models (DEMs) with a 2 foot cell size. These raw LiDAR point cloud data were used to create classified LiDAR LAS files, intensity images, 3D breaklines, and hydro-flattened DEMs as necessary.]
Supplemental Information
Data is available for download from: https://web.s3.wisc.edu/wsco-wisconsinview/lidar/Ashland/Ashland_2019_3DEP_Delivery Detailed, original metadata accompanying this LiDAR data is available inside the ‘Reports’ folder from WisconsinView.
Temporal Extent
Time Instant
2019-12-31T00:00:00
Bounding Box
West
-90.937478
East
-90.300592
North
46.873356
South
45.975118
ISO Topic Category
elevation
Place Keyword
Ashland County
Wisconsin
Place Keyword Thesaurus
Theme Keyword
Digital elevation models
Theme Keyword Thesaurus
LCSH
Theme Keyword
Lidar
Contours
Grids
Surface models
Terrain models
Hydrography
Topography
Elevations
Theme Keyword Thesaurus
LCSH
Status
completed
Maintenance and Update Frequency
unknown
Language
eng
Credit
U.S. Geological Survey
Point of Contact
Contact
Quantum Spatial, Inc.
Delivery Point
523 Wellington Way
City
Lexington
Administrative Area
KY
Postal Code
40503
Country
US
Email
jmonge@quantumspatial.com
Phone
859-277-8700

Spatial Reference Information

Reference System Identifier
Code
7588
Code Space
EPSG
Version
10.0

Data Quality Information

Lineage
Statement
Archived data at WisconsinView

Distribution Information

Format Name
LAS, GeoTIFF
Format Version
1.0
Distributor
University of Wisconsin-Madison
Distributor
Online Access
https://web.s3.wisc.edu/wsco-wisconsinview/lidar/Ashland/Ashland_2019_3DEP_Delivery
Protocol
WWW:DOWNLOAD-1.0-http--download
Name
WisconsinView.org
Function
download

Spatial Representation Information

Vector
Topology Level
geometryOnly
Vector Object Type
surface
Vector Object Count

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
AEFD8DB8-58FB-4B54-A52E-051F04F996EA
Metadata Point of Contact
Name
Arthur H. Robinson Map Library
Position Name
Metadata Technician
Delivery Point
550 N. Park Street
City
Madison
Administrative Area
WI
Postal Code
53706
Country
US
Email
askmap@library.wisc.edu
Phone
(608) 262-1471
Metadata Date Stamp
2022-11-17
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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