LiDAR Elevation Data: Dodge County, WI 2017

Identification Information

Citation

Title

LiDAR Elevation Data: Dodge County, WI 2017

Originator

U.S. Geological Survey

Publication Date

2020-06-23

Edition

2017

Geospatial Data Presentation Form

mapDigital

Abstract

This data represents LiDAR elevation information for Dodge County, WI in 2017. The following derivative products are available: classified LAS, 2-foot contours, hydro breaklines, and a countywide DEM. Also included for Dodge County are "boundary" (Boundary.shp), and "raster hillshade" (Hillshades.gdb).For project level: [WI Dodge County Lidar 2017 B17 Data Acquisition and Processing Production Task USGS Contract No. G16PC00022 Task Order No. G17PD00370 Woolpert Order No. 77511 CONTRACTOR: Woolpert, Inc. This task is for a high resolution data set of lidar covering approximately ±907 square miles of Dodge County along with a 100-meter buffer zone outside the county for the lidar data. The lidar data was acquired and processed in compliance with U.S. Geological Survey National Geospatial Program Lidar Base Specification version 1.2. Lidar at a nominal pulse spacing (NPS) of 0.7 meters. Data is a remotely sensed high resolution elevation data collected by an airborne platform. The lidar sensor uses a combination of laser range finding, GPS positioning, and inertial measurement technologies. The lidar systems collect data point clouds used to produce highly detailed Digital Elevation Models (DEMs) of the earth's terrain, man-made structures, and vegetation. WI Dodge County Lidar 2017 B17 task order was processed and delivered in NAD 1983 2011 WISCRS Dodge and Jefferson Feet. Final products include; LAS swath data, classified LAS tiles, raster DEMs of the bare-earth surface in IMG and ArcGrid format, and 8-bit gray scale intensity images. Tiled deliverable products conform to a 4,500 ft x 4,500 ft tiling. Each LAS file contains lidar point information, which has been calibrated and controlled. Additionally, each tiled LAS file was classified per task order requirements. Final deliverables also include hydrologic breakline data, survey control and checkpoint data, bridge abutment breaklines, lidar processing and survey reports in PDF format, FGDC metadata files for each data deliverable in .xml format, and a project tile index all provided in Esri format. Ground conditions: Lidar was collected in April of 2017, 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, Woolpert established a total of 15 ground control points that were used to calibrate the lidar to known ground locations established throughout the project area. Additional independent accuracy checkpoints were collected (58 NVA points and 48 VVA points) and used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.]For classified LAS: [Product: These lidar data are processed Classified LAS 1.4 files, formatted to 1351 individual 4,500’ x 4,500’ tiles; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary. Geographic Extent: The AOI is covering approximately ±907 square miles of Dodge County along with a 100-foot buffer zone outside the county for the lidar data. Dataset Description: N WI Dodge County Lidar 2017 B17 Lidar project called for the Planning, Acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.70 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Lidar Base Specification, Version 1.2. The data was developed based on a horizontal projection/datum of NAD 1983 2011 WISCRS Dodge and Jefferson Survey Feet and vertical datum of NAVD88 (GEOID12B), Survey Feet. Lidar data was delivered as; flightline-extent raw LAS v1.4 swaths, classified point cloud LAS v1.4 files formatted to 1351 individual 4,500’ x 4,500’ tiles in NAD 1983 2011 WISCRS Dodge and Jefferson Survey Feet. Derivatives were produced as tiled; Bare Earth Surface DEMs, Intensity Images; all tiled to the same 4,500’ x 4,500’ schema. Ground Conditions: Lidar was collected in April of 2017, 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, Woolpert established a total of 15 ground control points that were used to calibrate the lidar to known ground locations established throughout the project area. Additional independent accuracy checkpoints were collected (58 NVA points and 48 VVA points) and used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data. ]For hydro breaklines: [Product: Breaklines, were collected to aid in hydro-flattening processes. These Breaklines were used to create. Geographic Extent: The AOI is covering approximately ±907 square miles of Dodge County along with a 100-foot buffer zone outside the county for the lidar data. Dataset Description: N WI Dodge County Lidar 2017 B17 Lidar project called for the Planning, Acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.70 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Lidar Base Specification, Version 1.2. The data was developed based on a horizontal projection/datum of NAD 1983 2011 WISCRS Dodge and Jefferson Survey Feet and vertical datum of NAVD88 (GEOID12B), Survey Feet. Lidar data was delivered as; flightline-extent raw LAS v1.4 swaths, classified point cloud LAS v1.4 files formatted to 1351 individual 4,500’ x 4,500’ tiles in NAD 1983 2011 WISCRS Dodge and Jefferson Survey Feet. Derivatives were produced as tiled; Bare Earth Surface DEMs, (Erdas IMG and ESRI ArcGrid Format), Intensity Images; all tiled to the same 4,500’ x 4,500’ schema. Ground Conditions: Lidar was collected in April of 2017, 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, Woolpert established a total of 15 ground control points that were used to calibrate the lidar to known ground locations established throughout the project area. Additional independent accuracy checkpoints were collected (58 NVA points and 48 VVA points) and used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data. ]For DEM: [Product: These are Digital Elevation Model (DEM) data for WI Dodge County Lidar 2017 B17 Project Level as part of the required deliverables for WI Dodge County Lidar 2017 B17 project. Class 2 (ground) lidar points in conjunction with the hydro breaklines and bridge breaklines were used to create a 2.5 feet hydro-flattened Raster DEM. Geographic Extent: The AOI is covering approximately ±907 square miles of Dodge County along with a 100-foot buffer zone outside the county for the lidar data. Dataset Description: N WI Dodge County Lidar 2017 B17 Lidar project called for the Planning, Acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.70 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Lidar Base Specification, Version 1.2. The data was developed based on a horizontal projection/datum of NAD 1983 2011 WISCRS Dodge and Jefferson Survey Feet and vertical datum of NAVD88 (GEOID12B), Survey Feet. Lidar data was delivered as; flightline-extent raw LAS v1.4 swaths, classified point cloud LAS v1.4 files formatted to 1351 individual 4,500’ x 4,500’ tiles in NAD 1983 2011 WISCRS Dodge and Jefferson Survey Feet. Derivatives were produced as tiled; Bare Earth Surface DEMs (Erdas IMG and ESRI ArcGrid Format), Intensity Images; all tiled to the same 4,500’ x 4,500’ schema. Ground Conditions: Lidar was collected in April of 2017, 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, Woolpert established a total of 15 ground control points that were used to calibrate the lidar to known ground locations established throughout the project area. Additional independent accuracy checkpoints were collected (58 NVA points and 48 VVA points) and used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.]

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 Dodge County Wisconsin QL2 Lidar 2017 project was collected in April 2017. The lidar data will deliver benefits and provide transformational data necessary to gain a better understanding of current topographic conditions within the 907 square mile county. This high-resolution QL2 lidar dataset addresses several state functional activites including: flood-risk management, infrastructure and construction management, urban and regional planning, natural resources conservation, water supply and quality, cultural resources preservation and management, wildlife habitat management, renewable energy resources, resource mining, agriculture and precision farming, and telecommunications.]

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. [USGS Contract No. G16PC00022 CONTRACTOR: Woolpert, Inc. ] 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. [Breakline File Type = GDB Breakline Elevation Units = U.S. Feet Downhill Treatment Applied = Monotonic Type of Hydro Treatment Required = Hydro-flattened] 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. [Raster File Type = IMG Bit Depth/Pixel Type = 32-bit float Raster Cell Size = 2.5 U.S. Feet Interpolation or Resampling Technique = Triangulated Irregular Network Required Vertical Accuracy = 19.6 cm NVA] Digital Surface Model (DSM): A Digital Surface Model (DSM) captures both the natural and built/artificial features of the environment.

Temporal Extent

Time Instant

2017-01-01T00:00:00

ISO Topic Category

elevation

Place Keyword

Dane County

Wisconsin

Place Keyword Thesaurus

GNS

Theme Keyword

Digital elevation models

Theme Keyword Thesaurus

LCSH

Theme Keyword

Lidar

Contours

Grids

Surface models

Terrain models

Hydrography

Topography

Elevations

Intensity

Theme Keyword Thesaurus

LCSH

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

Woolpert

Delivery Point

4454 Idea Center Blvd

City

Dayton

Administrative Area

OH

Postal Code

45430

Country

US

Email

NienowZ@AyresAssociates.com

Phone

(937)461-5660

Spatial Reference Information

Reference System Identifier

Code

7600

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

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

15BA37F4-014D-4FED-8ABB-480FC49B1F09

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

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