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LiDAR Elevation Data: Vilas County, WI 2022

Identification Information

Citation
Title
LiDAR Elevation Data: Vilas County, WI 2022
Originator
U.S. Geological Survey
Publication Date
2023-04-05
Edition
2022
Geospatial Data Presentation Form
mapDigital
Other Citation Details
Contract No. 140G0221D0012, Task Order No. 140G0222F0081; CONTRACTOR: NV5 Geospatial
Abstract
This data represents LiDAR elevation information for Vilas County, Wisconsin in 2022. The following derivative products are available: classified LAS, Tiled DEM, Intensity images, Breaklines, and a tile index. [The WI_12County_1_B22_Vilas 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 Base Specifications 2021, Revision A. The data were developed based on a horizontal projection/datum of NAD 1983 2011 WISCRS Vilas Feet, Foot US and vertical datum of NAVD88 Geoid 18, Foot US. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to 1525 individual 4500 ft x 4500 ft tiles, as tiled intensity imagery, and as tiled bare earth DEMs; all tiled to the same 4500 ft x 4500 ft schema. Continuous breaklines were produced in Esri file geodatabase format. Ground Conditions: LiDAR was collected in spring 2022, 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, NV5 Geospatial utilized a total of 225 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 389 independent accuracy checkpoints, 227 in Bare Earth and Urban landcovers (227 NVA points), 162 in Tall Weeds categories (162 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.]LAS: These lidar data are processed Classified LAS 1.4 files, formatted to 1525 individual 4500 ft x 4500 ft tiles; used to create intensity images, 3D breaklines, and hydro-flattened DEMs as necessary.DEM: These are Digital Elevation Model (DEM) data for Wisconsin as part of the required deliverables for the WI_12County_1_B22_Vilas project. Class 2 (ground) LiDAR points in conjunction with the hydro breaklines were used to create a 1 foot hydro-flattened Raster DEM.Intensity: Raster File Type = GeoTIFF; Bit Depth/Pixel Type = 8-bit, 256 color gray scale; Raster Cell Size = 2 footBreaklines: Breakline data is used to hydroflatten the DEMs created for the WI_12County_1_B22_Vilas project. Breaklines are reviewed against LiDAR intensity imagery to verify completeness of capture.
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 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
DEM: Raster File Type = GeoTIFF; Bit Depth/Pixel Type = 32-bit float; Raster Cell Size = 1 foot; Interpolation or Resampling Technique = Triangulated Irregular Network (TIN), Linear Interpolation, Proprietary; Required Vertical Accuracy = 0.196 Intensity: Raster File Type = GeoTIFF; Bit Depth/Pixel Type = 8-bit, 256 color gray scale; Raster Cell Size = 2 foot
Temporal Extent
Time Instant
2022-05-15T00:00:00
Bounding Box
West
-90.0495896408
East
-88.9288635922
North
46.3017883396
South
45.854645726
ISO Topic Category
elevation
Place Keyword
Vilas County
Wisconsin
Place Keyword Thesaurus
GNS
Theme Keyword
Digital elevation models
Theme Keyword Thesaurus
LCSH
Theme Keyword
Lidar
Grids
Contours
Surface models
Terrain models
Relief models
Hydrography
Topography
Elevations
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
U.S. Geological Survey
Point of Contact
Contact
NV5
Phone
859-277-8700

Spatial Reference Information

Reference System Identifier
Code
8110
Code Space
EPSG
Version
9.7

Data Quality Information

Lineage
Process Step
Description
LAS
Process Step
Description
DEM
Process Step
Description
Intensity

Distribution Information

Format Name
Various
Format Version
1.0
Distributor
UW-Madison
Online Access
https://web.s3.wisc.edu/wsco-wisconsinview/lidar
Protocol
WWW:DOWNLOAD-1.0-http--download
Name
WisconsinView.org
Function
download

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
B2E72056-1AFB-4459-A6F1-6A9674ACDA71
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
2024-04-25
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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