LiDAR Elevation Data: Sauk County, WI 2011

Identification Information

Citation

Title

LiDAR Elevation Data: Sauk County, WI 2011

Originator

Sauk County

Publication Date

2020-07-16

Edition

2011

Abstract

This data represents LiDAR elevation information for Sauk County, Wisconsin in 2011. The following derivative products are available: bare earth points, classified LAS, 2-foot contours, hydro breaklines, and a countywide DEM. For bare earth points: [The Bare Earth LAS was developed from a LiDAR flight flown in the Fall of 2011 as part of the Sauk County 2011 WROC project.]For classified LAS: [The Point Cloud LAS was developed from a LiDAR flight flown in the Fall of 2011 as part of the Sauk County 2011 WROC project.]For 2-foot contours: [The Bare Earth DTM was developed from LAS points and breaklines collected from a LiDAR flight flown in the Fall of 2011, as part of the Sauk County 2011 WROC project. The DTM is used to develop a TIN (Triangulated Irregular Network). Two-foot contours meeting National Map Accuracy Standards were generated from the TIN.]For hydro breaklines: [The Breakline vectors were developed from the LiDAR points to define hard and soft breaklines, mostly hydrography, in the terrain surface, as part of the Sauk County 2011 lidar Project.]For DEM: [The Bare Earth DEM was developed from LAS points and breaklines collected from a LiDAR flight flown in the Fall of 2011, as part of the Sauk County 2011 Project. The DEM is a raster data set in ESRI GRID format with an X, Y, Z value located at the center of each 10 ft. by 10 ft. cell. The DEM was generated from a DTM meeting ASPRS class II Standards.]

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. For bare earth points: [The 2012 Bare Earth LAS and SHP files contain a subset of the total LiDAR point cloud. This dataset constitutes the bare terrain surface data set with all other classifications omitted. File formats include: ESRI Shapefile and LAS format. Coupled with the breakline features this data set is the 2012 Sauk County digital terrain model.] For classified LAS: [The 2012 Point Cloud files contain the total LiDAR point cloud. This dataset constitutes all classifications of lidar points. File formats include: ESRI Shapefile and LAS format.] For 2-foot contours: [The 2012 two-foot contours were developed as a derivative product for use in general surface modeling and depiction. File formats include ESRI Shapefile and AutoCAD DWG format.] For hydro breaklines: [The 2012 breaklines dataset contains the hydrographic breaklines necessary for terrain surface development. This dataset establishes the deviation parameters for the development of derivative terrain data. File formats include: ESRI shapefile and AutoCAD DWG format.] For DEM: [The 2012 Bare Earth two-Foot DEM was developed as a derivative product for use in general surface modeling and depiction.]

Supplemental Information

Data is available for download from: https://web.s3.wisc.edu/wsco-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. [Point Classes are as follows: 1 = Processed, Unclassified, 2 = Bare Earth Ground, 3 = Low vegetation, 4 = Medium vegetation, 5 = High vegetation, 6 = Building, 7 = Noise, 8 = Res. (Model keypoints), 9 = Water, 10 = Ignored Ground, 11 = Road, 12 = Res. (Overlap), 13= Railroad, 14, = Stream, 15 = Wire, 21 = High Points, 22 = Spurious Intensity, 31 = First of Many, 32 = Intermediate, 33 = Last of Many, 34 = Single/Only (Ground)] 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 2012 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

2013-01-01T00:00:00

ISO Topic Category

elevation

Place Keyword

Sauk 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

Status

completed

Maintenance and Update Frequency

unknown

Language

Credit

Sauk County

Point of Contact

Contact

Sauk County

Spatial Reference Information

Reference System Identifier

Code

8124

Code Space

EPSG

Version

9.7

Data Quality Information

Distribution Information

Format Name

Various

Format Version

10.5

Distributor

University of Wisconsin-Madison

Distributor

Online Access

https://web.s3.wisc.edu/wsco-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

38D9B533-7BFF-4E22-BC54-07DC2B6C449B

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