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OCM Partners, 2023: 2006 Federal Emergency Management Agency (FEMA) Topographic LiDAR: Cumberland and York Counties, Maine,

Item Identification

Title: 2006 Federal Emergency Management Agency (FEMA) Topographic LiDAR: Cumberland and York Counties, Maine
Short Name: me2006_fema_cumberlandyork_m2479_metadata
Status: Completed
Publication Date: 2013-04-15

In the fall of 2006, Sanborn Map Company was contracted by Camp Dresser McKee, Inc (CDM) to execute a LiDAR (Light Detection and Ranging) survey campaign in the state of Maine. LiDAR data in the form of 3-dimensional positions

of a dense set of masspoints was collected for the 584 sqaure miles of Cumberland and York Counties. This data was used in the development of the bare-earth-classified elevation point data sets. The Leica ALS-50 LiDAR system

was used to collect data for the whole survey campaign. The LiDAR system is calibrated by conducting flight passes over a known ground surface before and after each LiDAR mission. During final data processing, the calibration

parameters are inserted into post-processing software.

Six airborne GPS (Global Positioning System) base stations were used in this project. A new point was set at the Portland Airport (501) The other base stations were set up at National Geodetic Survey (NGS) markers. NGS Monuments

901- PID: OC0229 and 801 - PID: OC0230 are located at the Biddeford Airport. The other existing NGS monuments used in the network are point 701 - PID: AJ2697, located on Bailey Island, point 702 - PID: OC0429, located at Fort

Constitution, and point 703 - PID: OC0478 located southeast of York Beach were tied to the other three points to create a GPS survey network. The coordinates of these stations were checked against each other with the three

dimensional GPS baseline created at the airborne support set up and determined to be within project specifications.

Leica ALS-50 LiDAR Scanner Parameters:

Pulse Rate: 50,000 hertz

Scan Frequency: 36 hertz

Scan Width (Half Angle): 18 degrees

Flying Height: 1,200 meters above ground level

Flying Speed: ~120 knots


The LIDAR derived data sets, including Bare Earth and a Gridded DEM support Camp Dresser and McKee's continued development of updated Digital Flood Insurance Rate Maps and flood insurance studies for coastal areas

located in Cumberland and York Counties, Maine. Acquisition is Tide restricted to +/- 3 hours from Low tide.(Source: FEMA Guidelines and Specs, Appendix N).



Supplemental Information:

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


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category

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:

LiDAR points in LAS 1.0 format

Entity Attribute Detail Citation:


Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility

of Camp Dresser McKee Inc., Sanborn Map Company, FEMA, NOAA, the Office for Coastal Management or its partners.

Support Roles

Data Steward

CC ID: 677096
Date Effective From: 2013-04-15
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: 677098
Date Effective From: 2013-04-15
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: 677099
Date Effective From: 2013-04-15
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: 677097
Date Effective From: 2013-04-15
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: 1133876
W° Bound: -70.842773
E° Bound: -69.842006
N° Bound: 43.980053
S° Bound: 43.052971

Extent Group 1 / Time Frame 1

CC ID: 1133875
Time Frame Type: Range
Start: 2006-10-07
End: 2006-10-27

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:


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: 741328
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: 741329
Download URL:
File Name: Bulk Download

Simple download of data files.



CC ID: 741331
URL Type:
Online Resource


CC ID: 741332
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 677116
Activity Date/Time: 2016-05-23

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 677115
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: 718355
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 741330
Activity Date/Time: 2018-03-13

Partial upload to move data access links to Distribution Info.

Data Quality

Horizontal Positional Accuracy:

The NSSDA is used to report the horizontal accuracy of the base map data used by FEMA to produce a FIRM. The NSSDA uses radial accuracy (Accuracy) to report the radius of a circle of uncertainty, such that the true or

theoretical location of a point falls within that circle 95 percent of the time. (Guidelines and Specifications Vol 1, p. 70)

; Quantitative Value: 1.0 meters, Test that produced the value: Value in meters. Project specifications require a horizontal accuracy of 1.0 meters. Data not tested but compiled to meet.

Vertical Positional Accuracy:

The LiDAR data was evaluated by Sanborn using a collection of 24 GPS surveyed checkpoints. The data set's consolidated vertical accuracy is 0.165 meters (0.54 feet) RMSEz.; Quantitative Value: 0.165 meters, Test that produced the value: RMSEz in meters for all points.

Completeness Report:

The NOAA Office for Coastal Management visually inspected the bounding boxes of each tile. The only void in the data set is a portion of tile 20071127_27801050.

Conceptual Consistency:

Tests for logical consistency are performed by DFIRM tools topology verification software. The NOAA Office for Coastal Management checked the data set for logical consistency.


Process Steps

Process Step 1

CC ID: 1133872

Using the Leica ALS-50 Light Detection and Ranging (LiDAR) system, flight lines were planned for standard density 1.4

meter GSD. The Flight plan for the project includes the following specifications to fully meet the project requirements - single pass

density of approximately 1.4 square meters per sample * Swath width ~688 meters * Flight altitude 1200 meters * flight line

spacing ~516 meters with ~125 meters overlap *Scan Frequency- 36 Hz *Scan Angle- 16 degrees * Aircraft ground speed -- 120

knots * System Calibration pre and post mission * Two GPS base stations within 30 KM. Multiple returns were recorded for each

laser pulse along with an intensity value for each return. The data are calibrated for geographic referencing. Points are further

processed, using TerraSolid software, to classify return values. The first and last return data is filtered to remove the vegetation

and above ground manmade features to yield a ground surface.

Process Date/Time: 2007-02-13 00:00:00

Process Step 2

CC ID: 1133873

The NOAA Office for Coastal Management (OCM) received topographic files in LAS format. The files contained lidar

elevation and intensity measurements. The data were received in UTM Zone 19N (NAD83) coordinates

and were vertically referenced to NAVD88 using the Geoid03 model. The vertical units of the data were

meters. OCM performed the following processing for data storage and Digital Coast provisioning purposes:

1. The topographic las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid03.

2. The topographic las files were converted from a Projected Coordinate System (UTm 19N) to a Geographic Coordinate system (GCS).

3. The topographic las files' horizontal units were converted from meters to decimal degrees.

Process Date/Time: 2013-04-01 00:00:00

Catalog Details

Catalog Item ID: 49786
GUID: gov.noaa.nmfs.inport:49786
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