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LiDAR Elevation Data: Oconto County, WI 2019

Identification Information

Citation
Title
LiDAR Elevation Data: Oconto County, WI 2019
Originator
Federal Emergency Management Agency
Publication Date
2021-08-12
Edition
2019
Geospatial Data Presentation Form
mapDigital
Collection Title
Wisconsin Elevation Data, Coastal
Abstract
This data represents LiDAR elevation information for Oconto County, WI in 2019. The following derivative products are available: classified LAS, hydro breaklines, and tiled DEM. Also included are several countywide products created by the WisconsinView Partners - the WI Department of Administration’s Geographic Information Office in collaboration with the UW-Madison Space Science and Engineering Center’s (SSEC) WisconsinView repository. Original lidar data in tiled format from federal (USGS 3DEP) and/or local county lidar projects were used to create countywide mosaics of specific datasets such as DEMS, Intensity values and DSMs in various projections and coordinate systems. [Geographic Extent: 7 counties in Wisconsin, covering approximately 1198 total square miles. Dataset Description: The Oshkosh 3 Rivers 2018 - Oconto County project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.71 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 UTM Zone 16N, Meter and vertical datum of NAVD88 GEOID 12b, Meter. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to 1380 individual 1500 m x 1500 m tiles, as tiled intensity imagery, and as tiled bare earth DEMs; all tiled to the same 1500 m x 1500 m schema. Continuous breaklines were produced in Esri file geodatabase format. Ground Conditions: LiDAR was collected in spring 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 27 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 55 independent accuracy checkpoints, 30 in Bare Earth and Urban landcovers (30 NVA points), 25 in Tall Weeds categories (25 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.]Breaklines: [Breakline data is used to hydroflatten the DEMs created for the Oshkosh 3 Rivers 2018 - Oconto County project. Breaklines are reviewed against LiDAR intensity imagery to verify completeness of capture. ]Classified LAS: [These lidar data are processed Classified LAS 1.4 files, formatted to 1380 individual 1500 m x 1500 m tiles; used to create intensity images, 3D breaklines, and hydro-flattened DEMs as necessary.]Tiled DEM: [These are Digital Elevation Model (DEM) data for Wisconsin as part of the required deliverables for the Oshkosh 3 Rivers 2018 - Oconto County project. Class 2 (ground) LiDAR points in conjunction with the hydro breaklines were used to create a 1.0 meter hydro-flattened Raster DEM.]
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 1.0 meter 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/Oconto/Oconto_2019_FEMA_Delivery/ Detailed, original metadata accompanying this LiDAR data is available inside the ‘metadata’ folder from WisconsinView. 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. 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. 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. Intensity Images: LiDAR intensity is recorded as the return strength of a laser beam. It is a bi-product, provided as an integer number between 1-256. This number varies with the composition of the surface object reflecting the laser beam. A low number indicates low reflectivity while a high number indicates high reflectivity. The intensity of the laser beam return can also be affected by the angle of arrival (scan angle), range, surface composition, roughness, and moisture content.
Temporal Extent
Time Instant
2019-05-04T00:00:00
Bounding Box
West
-88.7119146041
East
-87.7252839998
North
45.4031556896
South
44.6503597918
ISO Topic Category
elevation
Place Keyword
Oconto County
Wisconsin
Place Keyword Thesaurus
GNS
Theme Keyword
Digital elevation models
Theme Keyword Thesaurus
LCSH
Resource Constraints
Use Limitation
[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 their limitations. Acknowledgement of the organization providing these data to the public would be appreciated for products derived from these data.]
Status
completed
Maintenance and Update Frequency
unknown
Language
eng
Credit
U.S. Geological Survey
Point of Contact
Contact
Federal Emergency Management Agency

Spatial Reference Information

Reference System Identifier
Code
6345
Code Space
EPSG
Version
10.031

Data Quality Information

Quantitative Attribute Accuracy Report

Distribution Information

Format Name
Various
Format Version
1.0
Distributor
University of Wisconsin-Madison
Distributor
Online Access
https://bin.ssec.wisc.edu/pub/wisconsinview/lidar/Oconto/Oconto_2019_FEMA_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
371D7B11-5315-4544-A428-33F2FFAC2985
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
2021-08-12
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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