2013 Vilas Lidar: Vilas County, WI

Product: These lidar data are processed Classified LAS 1.2 files, formatted to 5000 ft x 5000 ft tiles; bare earth DTM, DEM, first-return DSM, contours, breaklines, and intensity images as necessary. Geographic Extent: Vilas County, Wisconsin covering approximately 1017 square miles. Dataset Description: Vilas County, Wisconsin 2013 Lidar project called for the Planning, Acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 1.0 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.0. The data was developed based on a horizontal projection/datum of NAD_1983(2011)_WISCRS_Vilas_County_Feet (EPSG code: 7638), and vertical datum of NAVD88 - Geoid12A (Feet). Lidar data was delivered as flightline-extent unclassified LAS swaths, as processed Classified LAS 1.2 files, formatted to 1264 individual 5000 ft x 5000 ft tiles, as tiled Intensity Imagery, and as tiled bare earth DEMs; all tiled to the same 5000 ft x 5000 ft schema. Ground Conditions: Lidar was collected in early 2013, 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, Ayres Associates established ground control points that were used to calibrate the lidar to known ground locations established throughout the Vilas County, Wisconsin project area. An additional 1498 independent accuracy checkpoints were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.

This metadata was modified by NOAA to reflect adding access to the data via the Digital Coast Data Access Viewer (DAV). The DAV is leveraging an Entwine Point Tiles (EPT) version of the data hosted by USGS. The EPT data is in Web Mercator (EPSG:3857). The above paragraph describes the data as originally submitted by the Ayres Associates.

Original funding for the joint project covering Oneida and Vilas Counties came from the counties and a grant from the USGS.

To acquire detailed surface elevation data for use in design, research, floodplain mapping, and elevation modeling, etc. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create Intensity Images, Breaklines and Raster DEM. 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, intensity images, 3D breaklines, and hydro-flattened DEMs as necessary.

The following are the USGS lidar fields in JSON:

{

"ldrinfo" : {

"ldrspec" : "USGS-NGP Base Lidar Specification v1.0",

"ldrsens" : "Leica ALS70",

"ldrmaxnr" : "7",

"ldrnps" : "1.0",

"ldranps" : "1.0",

"ldrdens" : "1",

"ldradens" : "10",

"ldrfltht" : "2400",

"ldrfltsp" : "160",

"ldrscana" : "40",

"ldrscanr" : "37.7",

"ldrpulsr" : "229",

"ldrpulsd" : "4",

"ldrpulsw" : "0.41",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "523",

"ldrswato" : "10.32",

"ldrcrs" : "NAD_1983(2011)_WISCRS_Oneida_County_Feet (EPSG code: 7263)",

"ldrgeoid" : "North American Vertical Datum of 1988 - Geoid12A"

},

"ldraccur" : {

"ldrchacc" : "0.5",

"rawnva" : "0.116",

"rawnvan" : "40"

},

"lasinfo" : {

"lasver" : "1.2",

"lasprf" : "1",

"laswheld" : "The withheld class, class 11, contains all overlap points that are not suitable for the standard classifications of bare earth ground, water, vegetation, and buildings.",

"lasolap" : "The overlap points, found in Class 11, were deemed unreliable for the specifications of the project.",

"lasintr" : "11",

"lasclass" : {

"clascode" : "1",

"clasitem" : "Processed, but Unclassified"

},

"lasclass" : {

"clascode" : "2",

"clasitem" : "Bare Earth Ground"

},

"lasclass" : {

"clascode" : "3",

"clasitem" : "Low Vegetation"

},

"lasclass" : {

"clascode" : "4",

"clasitem" : "Medium Vegetation"

},

"lasclass" : {

"clascode" : "5",

"clasitem" : "High vegetation"

},

"lasclass" : {

"clascode" : "6",

"clasitem" : "Building"

},

"lasclass" : {

"clascode" : "7",

"clasitem" : "Noise"

},

"lasclass" : {

"clascode" : "8",

"clasitem" : "Res. (Model keypoints)"

},

"lasclass" : {

"clascode" : "9",

"clasitem" : "Water"

},

"lasclass" : {

"clascode" : "10",

"clasitem" : "Ignored Ground"

},

"lasclass" : {

"clascode" : "11",

"clasitem" : "Withheld Points"

},

"lasclass" : {

"clascode" : "13",

"clasitem" : "Bridge"

},

"lasclass" : {

"clascode" : "14",

"clasitem" : "Dam"

}

}}

Distributor assumes no liability for misuse of data.

Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners

Data is available online for bulk or custom downloads

None

Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations.

Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1 (Build 4959) Service Pack N/A (Build N/A)

A formal accuracy assessment of the horizontal positional information in the data set has not been conducted.

Vilas County:

Fundamental Vertical Accuracy (FVA) was computed for the point cloud data in order to achieve RMSEz of 12.5cm and 24.5 cm at the 95% confidence level. The FVA survey data was collected in clear and open terrain, referred to as bare earth (low grass, gravel) and urban land cover types in the vertical accuracy report. Vertical accuracy was tested in open terrain using 973 independent survey points, distributed evenly through the project, and used solely for the purpose of assessing vertical accuracy. The computed FVA for this project is 5.79 cm RMSEz and 11.37 cm at 95% confidence level.

The Supplemental Vertical Accuracy (SVA) was computed for the point cloud data in order to achieve 36.3 cm, 95th percentile. The SVA survey data was collected in vegetated terrain, referred to tall grass, low tree, and tall tree in the vertical accuracy report. Vertical accuracy was tested in vegetated terrain using 515 independent survey points, distributed evenly through the project, and used solely for the purpose of assessing vertical accuracy. The computed SVA for this project is 23.3 cm, 95th percentile level.

The Consolidated Vertical Accuracy (CVA) was computed for the point cloud data in order to achieve 36.3 cm, 95th percentile. The CVA survey data was collected in open and vegetated terrain. All independent check points collected for this project were used to compute CVA. Vertical accuracy was tested in open terrain using 1488 independent survey points, distributed evenly through the project, and used solely for the purpose of assessing vertical accuracy. The computed CVA for this project is 18.9 cm, 95th percentile level.

Spatial consistency of coverage of the Vilas County, WI Lidar 2013 project area was maintained throughout the dataset.

Spatial consistency of coverage of the Vilas County, WI Lidar 2013 project area was maintained throughout the dataset.

Data is backed up to cloud storage.