2018 ILHMP Lidar: Boone and Winnebago Counties, IL

LIDAR-derived binary (.las) files ASPRS ver 1.4 format containing classified points of all returns. We have 11 classifications: Unclassified, Ground, Low Veg (0.5 - 5 ft), Medium Veg (5 - 20 ft), High Veg (> 20 ft), Buildings, Low Noise, Water, Ignore Ground, Bridge Decks and High Noise. Model key points are bit-flagged and created from ground (class = 2) points using a two foot horizontal and a 0.2 foot vertical variance. The files are delivered in section formatted tiles. These files adhere to the National Enhanced Elevation Assessment (NEEA) Quality Level 2 (QL2) standards. The contractual aggregate nominal pulse spacing (ANPS) is less than or equal to 0.5m. The contractual aggregate nominal point density (ANPD) is 4.0 points or greater per square meter.

Boone County is approximately 303 square miles.

Winnebago County is approximately 554.5 square miles.

U18049 - Acquisition and processing of high fidelity Light Detection and Ranging (LiDAR) data for Boone and Winnebago counties commencing in the Spring of 2018. Services include LiDAR acquisition; ground control survey; LiDAR post-processing; LiDAR classification; hydro-flattening; QA/QC, and; development of derivative deliverable products (including metadata and reporting).

The following are the USGS lidar fields in JSON:

{

"ldrinfo" : {

"ldrspec" : "USGS NGP Base Specification v1.2",

"ldrsens" : "Optech Galaxy Airborne Laser Terrain Mappers (ALTM) SN5060385",

"ldrmaxnr" : "8",

"ldrnps" : "0.5",

"ldrdens" : "4",

"ldranps" : "0.5",

"ldradens" : "4",

"ldrfltht" : "1650",

"ldrfltsp" : "170",

"ldrscana" : "30",

"ldrscanr" : "88",

"ldrpulsr" : "400",

"ldrpulsd" : "3.5",

"ldrpulsw" : "1.05",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.25",

"ldrswatw" : "2901",

"ldrswato" : "20",

"ldrcrs" : "NAD_1983_2011_StatePlane_Illinois_East_FIPS_1201_Ft_US",

"ldrgeoid" : "National Geodetic Survey (NGS) Geoid12B"

},

"ldraccur" : {

"ldrchacc" : "0.17",

"rawnva" : "0.047",

"rawnvan" : "25",

"clsnva" : "0.049",

"clsnvan" : "15",

"clsvva" : "0.059",

"clsvvan" : "15"

},

"lasinfo" : {

"lasver" : "1.4",

"lasprf" : "6",

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

"lasolap" : "Swath "overage" points were identified in these files by a separate bit flag.",

"lasintr" : "12-bit",

"lasclass" : {

"clascode" : "1",

"clasitem" : "Undetermined/Unclassifed"

},

"lasclass" : {

"clascode" : "2",

"clasitem" : "Ground"

},

"lasclass" : {

"clascode" : "3",

"clasitem" : "Low Veg"

},

"lasclass" : {

"clascode" : "4",

"clasitem" : "Medium Veg"

},

"lasclass" : {

"clascode" : "5",

"clasitem" : "High Veg"

},

"lasclass" : {

"clascode" : "6",

"clasitem" : "Building"

},

"lasclass" : {

"clascode" : "7",

"clasitem" : "Low point (noise)"

},

"lasclass" : {

"clascode" : "9",

"clasitem" : "Water"

},

"lasclass" : {

"clascode" : "10",

"clasitem" : "Ignore ground (near a breakline)"

},

"lasclass" : {

"clascode" : "17",

"clasitem" : "Bridge Decks"

},

"lasclass" : {

"clascode" : "18",

"clasitem" : "High Noise"

}

}}

ASPRS ver 1.4 format:1 = Unclassified2 = Ground3 = Low Veg4 = Medium Veg5 = High Veg6 = Building7 = Low Noise9 = Water10 = Ignore Ground17 = Bridge18 = High NoiseModel key points are bit-flagged and created from ground (class = 2) points using a 2 foot horizontal and a 0.2 foot vertical variance.

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 Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095

This data set was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 17 cm RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy = +/- 40 cm at a 95% confidence level.

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

Boone County

Actual NVA accuracy was found to be RMSEz = 2.411 cm, equating to +/- 4.725 cm at the 95% confidence level.

Actual VVA accuracy was found to be +/- 5.882 cm at the 95th percentile.

Winnebago County

Actual NVA accuracy was found to be RMSEz = 2.674 cm, equating to +/- 5.241 cm at the 95% confidence level.

Actual VVA accuracy was found to be +/- 7.616 cm at the 95th percentile.

The dataset was captured, attributed, and reviewed to ensure completeness and accuracy of at least 95%.

The dataset was captured, attributed, and reviewed to ensure completeness and accuracy of at least 95%.

Data is backed up to tape and to cloud storage.

The NOAA Office for Coastal Management (OCM) downloaded this data from the USGS rockyweb site. OCM processed the data to make it available for custom download from the NOAA Digital Coast Data Access Viewer (DAV) and for bulk download from AWS S3.