2021 USGS Topobathy Lidar: McKenzie River Corridor, OR

Product: Classified LAS 1.4 files, formatted to 215 individual 3000ft x 3000ft tiles covering the McKenzie River Corridor Topobathymetric Lidar project area.

Geographic Extent: This dataset and derived products encompass an area covering approximately 8,216 Acres of McKenzie River.

Dataset Description: The McKenzie River Corridor Topobathymetric Lidar project called for the planning, acquisition, and processing of Topobathymetric Lidar data collected to Quality Level 1 (QL1) standards. Project specifications are based on the Geological Survey National Geospatial Program Lidar Base Specification, 2020 Revision A. The data was developed based on the NAD83 2011 horizontal datum and the NAVD88 Geoid 18 vertical datum. Data was projected in Oregon Statewide Lambert Conformal Conic. Lidar data was delivered as calibrated and classified LAS 1.4 files. Non-Vegetated Vertical Accuracy (NVA) was assessed using 23 check points located on bare earth in clear, unobstructed areas. Submerged Topography accuracy was assessed using 174 check points collected as feasible in depths up to 1m. Vegetated Vertical Accuracy (VVA) was assessed using 12 check points in Shrub, Forest, Tall Grass landcover types. Single swath nominal pulse spacing (NPS) was designed to be 0.35 at nadir. Aggregate Nominal Pulse Spacing (ANPS) was calculated to be 0.17 using all valid first return points. Derived products include: Topbathymetric Digital Elevation Models (DEMs), Topobathymetric Bare Earth Digital Elevation Models (DEMs), Highest Hit Digital Surface Models (DSMs), 2D waters edge breaklines, and a bathymetric coverage shape.

Ground Condition: Ground condition was free of snow and acquisition occurred free of smoke, fog and cloud cover.

The NOAA Office for Coastal Management (OCM) downloaded 215 laz files from this USGS site and processed the data to the Data Access Viewer (DAV): https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/OR_McKenzieRiverCorridor_Topobathy_2021_D21/OR_MKRC_Topobathy_2021/LAZ/

The purpose of the lidar data was to produce a high accuracy 3D dataset that meets all necessary standards laid out by the 3D Elevation Program and the McKenzie River Corridor Topobathymetric Lidar contract. The lidar point cloud data were used to create classified lidar LAS files, Topobathymetric DEMs, topobathymetric DEMs, highest hit DSMs, 2D breaklines delineating water features within the study area, and a bathymetric coverage shape.

USGS Contract No. G16PC00016

CONTRACTOR: NV5 Geospatial

Ground Control Points were acquired and calibrated by NV5 Geospatial

All lidar data acquisition, calibration, and follow-on processing were completed by NV5 Geospatial.

The following are the USGS lidar fields in JSON:

{

"ldrinfo" : {

"ldrspec" : "Geological Survey National Geospatial Program Lidar Base Specification, 2020 Revision A",

"ldrsens" : "Riegl VQ880GII - Green",

"ldrmaxnr" : "15",

"ldrnps" : "0.233",

"ldrdens" : "8",

"ldranps" : "0.17",

"ldradens" : "34.85",

"ldrfltht" : "400",

"ldrfltsp" : "140",

"ldrscana" : "40",

"ldrscanr" : "80 lines per second",

"ldrpulsr" : "200",

"ldrpulsd" : "1.5",

"ldrpulsw" : "0.28",

"ldrwavel" : "532",

"ldrmpia" : "1",

"ldrbmdiv" : "0.7",

"ldrswatw" : "291",

"ldrswato" : "60",

"ldrgeoid" : "Geoid 18"

},

"ldrinfo" : {

"ldrspec" : "Geological Survey National Geospatial Program Lidar Base Specification, 2020 Revision A",

"ldrsens" : "Riegl VQ880GII - Green",

"ldrmaxnr" : "15",

"ldrnps" : "0.349",

"ldrdens" : "8",

"ldranps" : "0.17",

"ldradens" : "34.85",

"ldrfltht" : "600",

"ldrfltsp" : "140",

"ldrscana" : "40",

"ldrscanr" : "80 lines per second",

"ldrpulsr" : "200",

"ldrpulsd" : "1.5",

"ldrpulsw" : "0.42",

"ldrwavel" : "532",

"ldrmpia" : "1",

"ldrbmdiv" : "0.7",

"ldrswatw" : "437",

"ldrswato" : "60",

"ldrgeoid" : "Geoid 18"

},

"ldrinfo" : {

"ldrspec" : "Geological Survey National Geospatial Program Lidar Base Specification, 2020 Revision A",

"ldrsens" : "Riegl VQ880GII - NIR",

"ldrmaxnr" : "15",

"ldrnps" : "0.348",

"ldrdens" : "8",

"ldranps" : "0.17",

"ldradens" : "34.85",

"ldrfltht" : "400",

"ldrfltsp" : "140",

"ldrscana" : "42",

"ldrscanr" : "uniform point spacing",

"ldrpulsr" : "150",

"ldrpulsd" : "3",

"ldrpulsw" : "0.08",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.2",

"ldrswatw" : "307",

"ldrswato" : "60",

"ldrgeoid" : "Geoid 18"

},

"ldrinfo" : {

"ldrspec" : "Geological Survey National Geospatial Program Lidar Base Specification, 2020 Revision A",

"ldrsens" : "Riegl VQ880GII - NIR",

"ldrmaxnr" : "15",

"ldrnps" : "0.523",

"ldrdens" : "8",

"ldranps" : "0.17",

"ldradens" : "34.85",

"ldrfltht" : "600",

"ldrfltsp" : "140",

"ldrscana" : "42",

"ldrscanr" : "uniform point spacing",

"ldrpulsr" : "150",

"ldrpulsd" : "3",

"ldrpulsw" : "0.12",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.2",

"ldrswatw" : "461",

"ldrswato" : "60",

"ldrgeoid" : "Geoid 18"

},

"ldraccur" : {

"ldrchacc" : "0",

"rawnva" : "0",

"rawnvan" : "23"

},

"lasinfo" : {

"lasver" : "1.4",

"lasprf" : "6",

"laswheld" : "Withheld (ignore) points are identified in these files using the standard LAS Withheld bit.",

"lasolap" : "Swath "overage" points were identified in these files using the standard LAS overlap bit.",

"lasintr" : "16",

"lasclass" : {

"clascode" : "1",

"clasitem" : "Processed, but Unclassified"

},

"lasclass" : {

"clascode" : "2",

"clasitem" : "Bare earth ground"

},

"lasclass" : {

"clascode" : "7",

"clasitem" : "Low Noise"

},

"lasclass" : {

"clascode" : "9",

"clasitem" : "Water"

},

"lasclass" : {

"clascode" : "17",

"clasitem" : "Bridge Decks"

},

"lasclass" : {

"clascode" : "18",

"clasitem" : "High Noise"

},

"lasclass" : {

"clascode" : "20",

"clasitem" : "Ignored Ground Near Breaklines"

},

"lasclass" : {

"clascode" : "40",

"clasitem" : "Submerged Topography"

},

"lasclass" : {

"clascode" : "41",

"clasitem" : "Water Surface"

},

"lasclass" : {

"clascode" : "45",

"clasitem" : "Water Column"

}

}}

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 and 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.

PosPac 7.1, Microstation CONNECT version, TerraScan Version 20, TerraModeler Version 20, TerraMatch Version 20, ESRI ArcGIS 10.8, Windows 10 Operating System

Horizontal Accuracy = 4 cm RMSEr

This data was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 10-cm RMSEz Vertical Accuracy Class.

USGS Determined Vertical Accuracy

Non-Vegetated Vertical Accuracy (NVA) = 3.6 cm RMSE

Vegetated Vertical Accuracy (VVA) = 19.35 cm at the 95th Percentile

These LAS data files include all data points collected. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. Bathymetric void areas have been interpolated. A bathymetric coverage shape has been provided as a separate deliverable. The raw point cloud is of good quality and data passes Non-Vegetated Vertical Accuracy specifications.

Classified LAS files were tested by NV5 for vertical accuracy. All data is seamless from one tile to the next, no gaps or no data areas.

Data is backed up to tape and to cloud storage.

The NOAA Office for Coastal Management (OCM) downloaded the laz data from the USGS rockyweb https site and processed it to be available for custom download from the Data Access Viewer (DAV).