LiDAR Elevation Data: Racine County, WI 2010

Identification Information

Citation

Title

LiDAR Elevation Data: Racine County, WI 2010

Originator

Racine County

Publication Date

2020-07-16

Edition

2010

Geospatial Data Presentation Form

mapDigital

Collection Title

Coastal

Abstract

This data represents LiDAR elevation information for Racine County, Wisconsin in 2010. The following derivative products are available: bare earth points, classified LAS, 2-foot contours, derived terrain, hydro breaklines, a countywide DEM, and tile DEMs. [This task order is for planning, acquisition, processing, and derivative products of lidar data for Starr Project number 400000096. FEMA Task Order number is HSFE05-11-J-0090. The area of data acquisition is for the entire county of Racine County in Wisconsin. The collection area consists of 332 square miles and was captured to the "Highest" vertical accuracy requirement. Specifications listed below are based on FEMA Procedure Memorandum No. 61 Standards for LiDAR and Other High Quality Digital Topography. This collection specification is the equivalent of a 2 foot contour accuracy, and was collected with a nominal pulse spacing of 1.3 meters. The airborne GPS and IMU data were processed immediately following each mission. In addition, a sample of the LIDAR data was post-processed at the completion of each mission and the data was reviewed to ensure planned data quality and coverage. ]

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 STARR - Racine County project is to provide high accuracy processed LiDAR data in Wisconsin. The project includes re-classification of previously collected LiDAR data to produce LAS files, contours, DTMs, DEMs and Breaklines for a 2 foot contour accuracy. The project consisted of acquisition, post-processing, and classification of LiDAR data. The classified bare-earth data achieved the following: Vertical accuracy achieved for the 332 square miles was of the Highest vertical accuracy at a RMSE Z of 0.481 ft (95% confidence level of less than 0.980 ft) or better in the "Open Terrain" land cover category. Accuracy statement is based on the area of moderate to flat terrain. Diminished accuracies are to be expected in areas of dense vegetation. The accuracy of the LiDAR data as tested met the vertical accuracy or better, however, derived products may be less accurate in areas of dense vegetation due to a lesser number of points defining the bare-earth in these areas. Data delivered in NAD 83 Universal Transverse Mercator (UTM) Zone 16N, NAVD88 GEOID09 Meters]

Supplemental Information

Data is available for download from: ftp://ftp.ssec.wisc.edu/pub/wisconsinview/lidar/ Detailed, original metadata accompanying this LiDAR data is available inside the ‘Metadata’ folder from WisconsinView. 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. [Coupled with the classified lidar point cloud this data set is the 2011 digital terrain model.] 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

2010-01-01T00:00:00

ISO Topic Category

location

Place Keyword

Racine County

Wisconsin

Place Keyword Thesaurus

GNS

Theme Keyword

Point

Theme Keyword Thesaurus

FGDC

Theme Keyword

Street Addresses

Theme Keyword Thesaurus

LCSH

Status

completed

Maintenance and Update Frequency

unknown

Language

eng

Credit

Racine County

Point of Contact

Contact

Racine County

Spatial Reference Information

Reference System Identifier

Code

7554

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

ftp://ftp.ssec.wisc.edu/pub/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

5D516817-B5A3-4274-8FE0-3C600849AA2E

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

Metadata Standard Name

ISO 19139 Geographic Information - Metadata - Implementation Specification

Metadata Standard Version

2007

Character Set

utf8