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LiDAR Elevation Data: Lincoln County, WI 2015

Identification Information

Citation
Title
LiDAR Elevation Data: Lincoln County, WI 2015
Originator
U.S. Geological Survey
Publication Date
2020-07-05
Edition
2015
Geospatial Data Presentation Form
mapDigital
Abstract
This data represents LiDAR elevation information for Lincoln County, WI in 2015. The following derivative products are available: classified LAS, 2-foot contours, hydro breaklines, a countywide DEM, and tile DEMs. [Geographic Extent: Lincoln County, WI Area of Interest, covering approximately 946 square miles. Dataset Description: The Lincoln County, WI LiDAR 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 meters. 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 Wisconsin County Coordinate System - Lincoln County, NAD83 (2011), US Survey Feet and vertical datum of NAVD1988 (GEOID12A), US Survey Feet. LiDAR data was delivered in RAW flight line swath format, processed to create Classified LAS 1.2 Files formatted to 1,396 individual 4500 ft x 4500 ft tiles. Corresponding 5-foot gridded Hydro Flattened Raster DEM Files tiles were created using the same 4500 ft x 4500 ft schema. Hydro-Flattening Breaklines were produced in ESRI shapefile format. The hydroflattened bare earth surface DEM was used to create 2-foot contours in ESRI file geodatabase format. Ground Conditions: LiDAR collection began in Spring 2015, 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, Quantum Spatial established a total of 121 control points (22 control calibration points and 99 QC checkpoints). These were used to calibrate the LIDAR to known ground locations established throughout the project area.]
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. [Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create Breaklines and Raster DEMs. The purpose of these lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 5 foot cell size. These raw lidar point cloud data were used to create classified lidar LAS files, 3D breaklines, hydro-flattened DEMs, and contours as necessary.]
Supplemental Information
Data is available for download from: https://web.s3.wisc.edu/wsco-wisconsinview/lidar/ [USGS Contract: G10PC00026 Task Order Number: G15PD00294 CONTRACTOR: Quantum Spatial Lidar data were acquired and calibrated by Quantum Spatial. All follow-on processing was completed by the prime contractor. ] Below are the definitions for each LiDAR derivative product. This can be entered here in Supplemental Information for each one present in a county. Bare Earth Points: Bare earth LiDAR is digital elevation data of the terrain surface consisting of irregularly spaced points, each with x/y location coordinates and z-value. The data have been subjected to automated and manual editing to remove vegetation, buildings, and other man-made structures. Classified LAS: Point classification using semi-automated techniques on the point cloud to assign the feature type associated with each point. Lidar points can be classified into a number of categories including bare earth or ground, top of canopy, and water. The different classes are defined using numeric integer codes in the LAS files. Contours: A line through all contiguous points of equal elevation value. Contours are vector features used to represent the elevation of a landscape in a relatively familiar way. They are typically used for basemaps and general topographic representation. Derived Terrain: A vector data set composed of regularly spaced points and natural features such as ridges and breaklines. A DTM augments a DEM by including linear features of the bare-earth terrain. Hydro Breaklines: Breaklines maintain the definition of water-related features in an elevation model. They are used to capture linear discontinuities in the surface, lake shorelines, single-line drains for small rivers, and double-line drains for large rivers. Countywide Digital Elevation Model (DEM): A DEM represents the bare-Earth surface, removing all natural and built features. The dataset contains a single file covering the entire county. Tiled Digital Elevation Model (DEM): A Digital Elevation Model (DEM) represents the bare-Earth surface, removing all natural and built features. The data contains (possibly) hundreds of individual files available to download as small tiled geographic areas over the extent of an entire county. Digital Surface Model (DSM): A Digital Surface Model (DSM) captures both the natural and built/artificial features of the environment.
Temporal Extent
Time Instant
2015-01-01T00:00:00
Bounding Box
West
-91.55581
East
-90.770291
North
46.959189
South
46.15449
ISO Topic Category
elevation
Place Keyword
Lincoln County
Wisconsin
Place Keyword Thesaurus
GNS
Theme Keyword
Digital elevation models
Theme Keyword Thesaurus
FGDC
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
U.S. Geological Survey
Point of Contact
Contact
Ayres Associates
Delivery Point
5201 E Terrace Drive, Suite 200
City
Madison
Administrative Area
Wisconsin
Postal Code
53718
Email
NienowZ@AyresAssociates.com
Phone
(608) 443-1200

Spatial Reference Information

Reference System Identifier
Code
7617
Code Space
EPSG
Version
9.7

Data Quality Information

Distribution Information

Format Name
Various
Format Version
1.0
Distributor
University of Wisconsin-Madison
Distributor
Online Access
https://web.s3.wisc.edu/wsco-wisconsinview/lidar/
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
5A996BC7-336A-461D-BB85-2A68F44EAA24
Metadata Point of Contact
Name
Arthur H. Robinson Map Library
Position Name
metadata technician
Delivery Point
550 N. Park St
City
Madison
Administrative Area
Wisconsin
Postal Code
53706
Country
US
Email
askmap@library.wisc.edu
Phone
(608) 262-1471
Metadata Date Stamp
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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