2015 ILHMP Lidar: Bureau County, IL

This project involved fixed wing aerial LIDAR data collected at a contracted point spacing of 0.70 meters for the Illinois County of Bureau totaling approximately 875 square miles. This classified LAS Data was created from the final controlled swath data.

This metadata record supports the data entry in the NOAA Digital Coast Data Access Viewer (DAV). For this data set, the DAV is leveraging the Entwine Point Tiles (EPT) hosted by USGS on Amazon Web Services.

To acquire detailed surface elevation data for the Illinois Height Modernization Program (ILHMP) which is managed by the Illinois State Geological Survey (ISGS).

LiDAR

The following are the USGS lidar fields in JSON:

{

"ldrinfo" : {

"ldrsens" : "Leica ALS70-HP",

"ldrspec" : "1.2",

"ldrmaxnr" : "4",

"ldrnps" : "0.67",

"ldrdens" : "2.20",

"ldranps" : "0.67",

"ldradens" : "2.20",

"ldrfltht" : "1950",

"ldrfltsp" : "150",

"ldrscana" : "40",

"ldrscanr" : "53.4",

"ldrpulsr" : "260",

"ldrpulsd" : "10",

"ldrpulsw" : "3",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "1535",

"ldrswato" : "20",

"ldrcrs" : "NAD_1983_2011_Stateplane_Illinois_West_FIPS_1202_Ft_US",

"ldrgeoid" : "National Geodetic Survey (NGS) Geoid12A. The GEOID12A model is intended to transform between NAD 83 (2011/PA11/MA11) and the respective vertical datums for the different regions, including NAVD88, GUVD04, ASVD02, NMVD03, PRVD02 and VIVD09."

},

"ldraccur" : {

"ldrchacc" : "0.328 feet RMSEz",

"rawnva" : "0.182 feet RMSEz, 0.357 feet 95% CL",

"rawnvan" : "21",

"clsnva" : "0.174 feet RMSEz, 0.341 feet 95% CL bare earth",

"clsnvan" : "21",

"clsvva" : "0.501 feet 95th Percentile, Short Grass, Tall Grass, Trees/Forested, Brush",

"clsvvan" : "84"

},

"lasinfo" : {

"lasver" : "1.2",

"lasolap" : "17",

"laswheld" : "11",

"lasintr" : "11",

"lasprf" : "3",

"lasclass" : {

"clascode" : "1",

"clasitem" : "Unclassified"

},

"lasclass" : {

"clascode" : "2",

"clasitem" : "Ground"

},

"lasclass" : {

"clascode" : "3",

"clasitem" : "Low vegetation"

},

"lasclass" : {

"clascode" : "4",

"clasitem" : "Medium vegetation"

},

"lasclass" : {

"clascode" : "5",

"clasitem" : "High vegetation"

},

"lasclass" : {

"clascode" : "6",

"clasitem" : "All structures except bridges"

},

"lasclass" : {

"clascode" : "7",

"clasitem" : "All noise"

},

"lasclass" : {

"clascode" : "8",

"clasitem" : "Keypoint"

},

"lasclass" : {

"clascode" : "9",

"clasitem" : "Water"

},

"lasclass" : {

"clascode" : "10",

"clasitem" : "Proximity to hydro breakline"

},

"lasclass" : {

"clascode" : "17",

"clasitem" : "bridge decks"

},

"lasclass" : {

"clascode" : "18",

"clasitem" : "high noise"

},

"lasclass" : {

"clascode" : "19",

"clasitem" : "Overlap Low vegetation"

},

"lasclass" : {

"clascode" : "20",

"clasitem" : "Overlap Medium vegetation"

},

"lasclass" : {

"clascode" : "21",

"clasitem" : "Overlap High vegetation"

},

"lasclass" : {

"clascode" : "22",

"clasitem" : "Overlap All structures except bridges"

},

"lasclass" : {

"clascode" : "23",

"clasitem" : "Overlap All noise"

},

"lasclass" : {

"clascode" : "24",

"clasitem" : "Overlap Keypoint"

},

"lasclass" : {

"clascode" : "25",

"clasitem" : "Overlap Water"

},

"lasclass" : {

"clascode" : "26",

"clasitem" : "Overlap proximity to hydro breakline"

}

}}

ASPRS

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.

Microsoft Windows 7.0 Service Pack 1; ESRI ArcCatalog 9.3.0.1770

2 ft RMSE

The LAS Data must meet a Non-Vegetated Vertical Accuracy (NVA) equal to or less than 0.328 feet (10cm ) RMSEz and Vegetated Vertical Accuracy (VVA) equal to or less than 29.4cm at the 95th percentile. These vertical accuracies were tested using 105 independent survey check points in the following feature types: bare earth (21), Short Grass (22), Tall Grass (22), Trees/Forested (20) and Brush (20). The vertical accuracy is 0.174 ft (5.3 cm) RMSE.

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

This total point cloud classified LAS Data was created from the final controled swath data.

Data is backed up to tape and to cloud storage.

The NOAA Office for Coastal Management (OCM) ingested references to the USGS Entwine Point Tile (EPT) files hosted on Amazon Web Services (AWS) into the Digital Coast Data Access Viewer (DAV). The DAV accesses the point cloud as it resides on AWS under the usgs-lidar-public-container.