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10573900
1.0
FALSE
Hydro_Breaklines
0.000
2232232.555595
2359558.348843
309390.436011
439784.464593
1
002
Projected
GCS_North_American_1983
Linear Unit: Foot_US (0.304801)
NAD_1983_StatePlane_Wisconsin_South_FIPS_4803_Feet
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20201120
16540100
20201120
16540100
Hydro_Breaklines
Feature Class
1312
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Internal feature number.
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Esri
Coordinates defining the features.
Elevation
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Ayres Associates
(608) 443-1200
5201 E Terrace Drive, Suite 200
Madison
Wisconsin
53718
U.S.A.
20201120
ArcGIS Metadata
1.0
Hydro_Breaklines
2020-04-22
Ayres Associates
Jefferson County, Wisconsin Lidar; Hydro Flattened Breaklines
The Jefferson County lidar project area covers approximately 589 square miles which includes a 100 meter buffer around the county boundary. The lidar data was acquired at a nominal point spacing (NPS) of 0.7 meters and a aggregate nominal point density (ANPD) of 2.0. Project specifications are based on Jefferson County requirements and on the U.S. Geological Survey National Geospatial Program LiDAR Base Specification, Version 1.3. The data was developed based on a horizontal projection/datum of NAD83(2011) / Wisconsin State Plane, South Zone (ftUS) (EPSG Code: 6609), and vertical datum of NAVD88 - Geoid12B (Feet). LiDAR data was acquired using two Riegl VQ 1560i sensors with serial numbers SN546 and SN061 from April 20, 2019 to April 21, 2019 in 2 total lifts. Acquisition occurred with leaves absent from deciduous trees, when no snow was present on the ground, and with rivers at or below normal levels.
This data, along with its derivatives, is the result of a countywide elevation mapping with cooperative partnerships from Jefferson County, Wisconsin DOA, and the USGS 3DEP program. This data was produced from lidar data collected in April 2019, which was processed and delivered in 2020.
Wisconsin
Jefferson County
Breaklines
Lidar
Elevation Data
Model
Breaklines
Lidar
Elevation Data
Wisconsin
Model
Jefferson County
No restrictions apply to these data.
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be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions.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 its limitations. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.
ground condition
2019-04-20
2019-04-21
-89.017705
-88.531846
42.839083
43.202365
Breakline File Type = SHP Breakline Elevation Units = US Survey Feet Downhill Treatment Applied = Monotonic Type of Hydro Treatment Required = Hydro-flattened
Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.1.9270
1
-89.016598
-88.533358
43.202354
42.839494
Last metadata review date: 20200422
None.
None.
Data covers the entire area specified for this project. Breaklines were collected in all inland ponds and lakes ~2 acres or greater. These features were flat and level water bodies at a single elevation for each vertex along the bank. The entire water surface edge is at or below the immediate surrounding terrain. Breaklines were collected for all streams and rivers ~20' nominal width or wider. These features are flat and level bank to bank, gradient will follow the surrounding terrain and the water surface will be at or below the surrounding terrain. Streams/river channels will break at culvert locations however not at elevated bridge locations.
All files are inspected to ensure that they conform to the specified file naming conventions, all files load in their correct geographic position, all files conform to the project specifications for file standard and content.
LiDAR processing utilizes several software packages, including GeoCue and the TerraSolid suite of processing components. The GeoCue software is a database management system for housing the LiDAR dataset (usually multiple gigabytes in size). GeoCue incorporates a thorough checklist of processing steps and quality assurance/quality control (QA/QC) procedures that assist in the LiDAR workflow. The TerraSolid software suite is used to automate the initial classification of the LiDAR point cloud based on a set of predetermined parameters. Lidar technicians refer to ground cover research (natural and cultural features) within the project area and determine algorithms most suitable for the initial automated LiDAR classification. (Some algorithms/filters recognize the ground in forests well, while others have greater capability in urban areas). During this process each point is given an initial classification (e.g., as ground, vegetation, or noise) based on the point's coordinates and the relation to its neighbors. Classifications to be assigned include all those outlined by ASPRS standards. The initial classifications produce a coarse and inexact dataset, but offer an adequate starting point for the subsequent manual classification procedure. During this step, "overlap" points are automatically classified (those originating from neighboring flightlines) using information gathered from the ABGPS and IMU data. Any duplicate points existing from adjacent flightlines are removed during this process. Hydrographic breaklines are collected using LiDARgrammetry to ensure hydroflattened water surfaces. This process involves manipulating the LiDAR data's intensity information to create a metrically sound stereo environment. From this generated "imagery", breaklines are photogrammetrically compiled. Breakline polygons are created to represent open water bodies. The LiDAR points that fall within these areas are classified as "water." Hydro-flattened breaklines were compiled for ponded water that is 2 acres or greater, permanent islands 1 acre or larger, and double lined streams with a minimum width of 20 feet. Streams break at road crossings (culvert locations). The road fills are not be removed from the DEM. Streams are not broken at bridges. When the identification of a feature as a bridge or culvert cannot be made reliably, the feature will be regarded as a culvert. Breaklines representing streams and rivers shall be smooth, continuous, and monotonic, and represent the water surface without any stair steps except for dams and rapids. All hydrographic breaklines include a 3.125 foot buffer, with the Class 2 (bare earth) points being re-classified as Class 20 (ignored ground). TerraSolid is further used for the subsequent manual classification of the LiDAR points allowing technicians to view the point cloud in a number of ways to ensure accuracy and consistency of points and uniformity of point coverage.
2019-05-28
Feature Class
dataset
EPSG
5.3(9.0.0)
1312
Simple
FALSE
1312
TRUE
FALSE