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Short Citation:
OCM Partners, 2023: 2007 ARRA Lidar: Lake County (IL),

Item Identification

Title: 2007 ARRA Lidar: Lake County (IL)
Short Name: il2007_arra_lake_co_m4794_metadata
Status: Completed
Publication Date: 2015-01-15

The Classified Point Cloud LAS files consist of 5 different classifications: Unclassified, Ground, Noise, Water and Ignored Ground. Merrick used the Leica ALS50 sensor. Merrick & Company flew a mapping mission in April/May 2007 to capture aerial photography over 539 square miles of Lake County, Illinois.


Questions pertaining to this dataset can be forward to the Lake County Department of Information and Technology/GIS Mapping Division in Waukegan, IL at (or



Supplemental Information:

A report for this project is available at:

A footprint of this data set may be viewed in Google Earth at:


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
None Ground
None Terrain

Temporal Keywords

Thesaurus Keyword
None 2007

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: las
Entity Attribute Overview:

LAS 1.2 format (classes 1,2,9,10)

Entity Attribute Detail Citation:


Distribution Liability:

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

Support Roles

Data Steward

CC ID: 675873
Date Effective From: 2015-01-15
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


CC ID: 675875
Date Effective From: 2015-01-15
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Metadata Contact

CC ID: 675876
Date Effective From: 2015-01-15
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Point of Contact

CC ID: 675874
Date Effective From: 2015-01-15
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1136354
W° Bound: -88.2023
E° Bound: -87.75516
N° Bound: 42.497153
S° Bound: 42.155385

Extent Group 1 / Time Frame 1

CC ID: 1136353
Time Frame Type: Range
Start: 2007-04-16
End: 2007-05-07

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

This data can be obtained on-line at the following URL:

The data set is dynamically generated based on user-specified parameters.;

Data Access Constraints:


Data Use Constraints:

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. These data depict the heights at the time of the survey and are only accurate for that time.

Distribution Information

Distribution 1

CC ID: 741181
Download URL:
File Name: Customized Download

Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

Distribution 2

CC ID: 741182
Download URL:
File Name: Bulk Download

Simple download of data files.



CC ID: 741184
URL Type:
Online Resource


CC ID: 741185
URL Type:
Online Resource


CC ID: 741186
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz

This graphic shows the lidar coverage for the 2007 ARRA lidar project for Lake County, Illinois

Activity Log

Activity Log 1

CC ID: 675893
Activity Date/Time: 2016-05-23

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 675892
Activity Date/Time: 2017-11-14

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using '' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 718322
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 741183
Activity Date/Time: 2018-03-13

Partial upload to move data access links to Distribution Info.

Data Quality


See report

Horizontal Positional Accuracy:

The ortho imagery horizontal positional accuracy and the assurance of that accuracy depend, in part, on the accuracy of the data inputs to the rectification process. These inputs consist of the digital terrain model (DTM), fully digital analytic aerotriangulation (FDAAT) control and methods, the photo source camera calibration, scanner calibration, and aerial photographs. The orthoimagery output from these inputs meet National Map Accuracy Standards (NMAS). Aerial cameras have current certification from the USGS, National Mapping Division, Optical Science Laboratory. Test calibration scans are performed on all source photography scanners.; Quantitative Value: 0.068 meters, Test that produced the value: The horizontal positional accuracy value is derived from a standard aerotriangulation process known as a simultaneous bundle adjustment. Coordinates of ground points are derived from the measured coordinates of image points using mathematical functions. These corrections are made to points distributed over a large area, known as a block. The resulting solution is obtained simultaneously for all points to maintain consistency of all the stereo-models within the block. 0.236 feet RMSE X; 0.212 feet RMSE Y, averaging to 0.224 ft overall.

Vertical Positional Accuracy:

NSSDA accuracy of 0.59 feet exceeds Fundamental Vertical Accuracy (FVA) requirement of 0.6 feet; Quantitative Value: 0.088 meters, Test that produced the value: RMSE(z) in meters

Completeness Report:

The dataset was reviewed to ensure complete coverage of the project area.

Conceptual Consistency:

Calibrations of the LIDAR flightline data are performed; this process is known as boresighting. The flightlines are compared to evaluate both their relative and absolute accuracies.


Process Steps

Process Step 1

CC ID: 1136350

LiDAR data was collected using Leica ALS50 Phase I sensor. The raw data was verified in MARS software for complete coverage of the project area, and boresighted to align the flightlines. Raw data files were parsed into manageable client-specific tiles. These tiles were then processed through automated filtering that separates the data into different classification groups: unclassified points, ground points, "noise" points and water. The data was next taken into MARS to reclassify the erroneous points that may remain in the LiDAR point cloud after auto-filter.

Process Date/Time: 2010-01-01 00:00:00

Process Step 2

CC ID: 1136351

The NOAA Office for Coastal Management (OCM) received the files in laz format from USGS via an FTP online repository. The files contained lidar elevation and intensity measurements. The data were in UTM Zone 5, NAVD88 (orthometric) heights in meters. OCM performed the following processing for data storage and Digital Coast provisioning purposes:

1. The data were converted from UTM coordinates to geographic coordinates.

2. The data were converted from NAVD88 (orthometric) heights in meters to GRS80 (ellipsoid) heights in feet using Geoid 03.

3. The LAS data were sorted by latitude and the headers were updated.

Process Date/Time: 2015-01-10 00:00:00

Catalog Details

Catalog Item ID: 49759
GUID: gov.noaa.nmfs.inport:49759
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:22+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2022-03-16
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-03-16
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-03-16