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LiDAR Elevation Data: Trempealeau County, WI 2022
- Identification Information
- Spatial Reference Information
- Data Quality Information
- Distribution Information
- Metadata Reference Information
Identification Information
- Citation
- Title
- LiDAR Elevation Data: Trempealeau 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 Trempealeau County, Wisconsin in 2022. The following derivative products are available: classified LAS, hydro breaklines, tile DEMs, intensity images and a tile index. [The WI_12County_7_B22_Trempeleau 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 Trempealeau 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 1099 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. There are two empty tiles (784321 and 802308) due to water.]LAS: These lidar data are processed Classified LAS 1.4 files, formatted to 1099 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_7_B22_Trempeleau 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 = 1 footBreaklines: Breakline data is used to hydroflatten the DEMs created for the WI_12County_7_B22_Trempeleau 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 = 1 foot
- Temporal Extent
- Time Instant
- 2022-04-27T00:00:00
- Bounding Box
- West
- -91.6158923616
- East
- -91.1488198258
- North
- 44.598064059
- South
- 43.9830136942
- ISO Topic Category
- elevation
- Place Keyword
- Trempealeau 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 Geospatial
- Phone
- 859-277-8700
Spatial Reference Information
- Reference System Identifier
- Code
- 7636
- Code Space
- EPSG
- Version
- 9.7
Data Quality Information
- Lineage
- Process Step
- Description
- LAS
- Process Step
- Description
- DEM
- Process Step
- Description
- Intensity
- Process Step
- Description
- Breaklines
Distribution Information
- Format Name
- Various
- Format Version
- 1.0
- Distributor
- Online Access
- https://web.s3.wisc.edu/wsco-wisconsinview/lidar
- Protocol
- WWW:DOWNLOAD-1.0-http--download
- Name
- GeoData@Wisconsin
- Function
- download
Metadata Reference Information
- Hierarchy Level
- dataset
- Metadata File Identifier
- 54FCDFC8-910E-47AF-8263-55042651BEC3
- 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
- 2024-04-25
- Metadata Standard Name
- ISO 19139 Geographic Information - Metadata - Implementation Specification
- Metadata Standard Version
- 2007
- Character Set
- utf8