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LiDAR Elevation Data (QL1 and QL2): Ashland County, WI 2019
- Identification Information
- Spatial Reference Information
- Data Quality Information
- Distribution Information
- Spatial Representation Information
- Metadata Reference Information
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://bin.ssec.wisc.edu/pub/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
- 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://bin.ssec.wisc.edu/pub/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
- 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