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LiDAR Elevation Data: City of Madison, WI 2016
- Identification Information
- Spatial Reference Information
- Data Quality Information
- Distribution Information
- Spatial Representation Information
- Metadata Reference Information
Identification Information
- Citation
- Title
- LiDAR Elevation Data: City of Madison, WI 2016
- Originator
- City of Madison
- Publication Date
- 2021-07-26
- Edition
- 2016
- Geospatial Data Presentation Form
- mapDigital
- Collection Title
- Wisconsin Elevation Data
- Abstract
- This data represents LiDAR elevation information for the City of Madison, Wisconsin in 2016. The following derivative products are available: classified LAS, hydro breaklines, and tiled DEM. [The City of Madison, Wisconsin project area covers approximately 183 square miles. Lidar data was acquired with a nominal point spacing (NPS) of 1.0 meters. The data was developed based on a horizontal projection/datum of Wisconsin County Reference System (WISCRS) – Dane County Coordinates; North American Datum 1983 (2011), survey feet, and vertically geo-referenced to the North American Vertical Datum 1988, survey feet. LiDAR data was acquired using the Trimble Harrier sensor. Collection occurred in March 2016 during leaf-off conditions, while no snow was on the ground and rivers were at or below normal levels. The LiDAR data was calibrated using information collected at the time of flight from GPS base stations on the ground and airborne GPS/IMU in the aircraft. The calibrated LiDAR data was processed to produce a classified point cloud, bare earth DEM, breaklines, and other LiDAR derivatives. The LiDAR data was delivered according to a 5,000 foot x 5,000 foot tile schematic.]
- 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. [The purpose of these lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 3.125 foot cell size. These raw lidar point cloud data were used to create classified lidar LAS files, 3D breaklines, hydro-flattened DEMs, and other LiDAR-base derivatives as necessary.]
- Supplemental Information
- Data is available for download from: https://web.s3.wisc.edu/wsco-wisconsinview/lidar/Dane/Madison_2016_City_Delivery/ Detailed, original metadata accompanying this LiDAR data is available inside the ‘Metadata’ folder. 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. [Point Classes are as follows: 1 = Processed, Unclassified 2 = Bare Earth Ground 7 = Low Points (Noise) 9 = Water 10 = Ignored Ground 11 = Withheld] 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. [Breaklines represent Pond, Double Line Drain, Island, and Hard Breakline. Breaklines were translated to ESRI shapefile format using ESRI conversion software.] 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 city.
- Temporal Extent
- Time Instant
- 2016-03-20T00:00:00
- Bounding Box
- West
- -89.6046
- East
- -89.186212
- North
- 43.196283
- South
- 42.985217
- ISO Topic Category
- elevation
- Place Keyword
- City of Madison
-
Wisconsin
- Place Keyword Thesaurus
- GNS
- Theme Keyword
-
Digital elevation models
- Theme Keyword Thesaurus
- LCSH
- Resource Constraints
- Use Limitation
- [None. However, temporal changes to the Earth's surface may have occurred since the acquisition of the lidar data and may no longer represent current bare earth surface conditions.]
- Status
- completed
- Maintenance and Update Frequency
- unknown
- Language
- eng
- Credit
- City of Madison
- Point of Contact
- Contact
- City of Madison
Spatial Reference Information
- Reference System Identifier
- Code
- 8193
- 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://web.s3.wisc.edu/wsco-wisconsinview/lidar/Dane/Madison_2016_City_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
- 16BCC84A-72B9-4C06-B24E-2F720927F129
- 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
- askmap@library.wisc.edu
- Phone
- (608) 262-1471
- Metadata Date Stamp
- 2021-07-26
- Metadata Standard Name
- ISO 19139 Geographic Information - Metadata - Implementation Specification
- Metadata Standard Version
- 2007
- Character Set
- utf8