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Short Citation:
OCM Partners, 2023: Escambia County Alabama, Lidar,

Item Identification

Title: Escambia County Alabama, Lidar
Short Name: Escambia, AL LiDAR m8596
Status: Completed
Publication Date: 2013-12-16

LiDAR generated point cloud acquired in January 2013 for the entire area of Escambia County Alabama.


LIDAR data is remotely sensed high-resolution elevation data collected by an airborne collection platform. Using a combination of laser range finding, GPS positioning and inertial measurement technologies; LIDAR instruments are able to make highly detailed Digital Elevation Models (DEM) of the earth's terrain, man-made structures and vegetation. LIDAR data is used for 3D visualization, elevation based analysis and for feature extraction. This data was collected at a nominal point spacing to support flood plain analysis, hydrological modeling, and general land use planning.

Supplemental Information:

The LiDAR survey was conducted between January 22nd, 2013 and January 31st, 2013.


Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
Global Change Master Directory (GCMD) Science Keywords
ISO 19115 Topic Category
LiDAR Elevation
LiDAR Topography

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
Global Change Master Directory (GCMD) Location Keywords
Escambia Alabama
Escambia Escambia
Escambia United States

Instrument Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Instrument Keywords
LIDAR > Light Detection and Ranging

Platform Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Platform Keywords
Airplane > Airplane

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Elevation
Maintenance Frequency: As Needed
Data Presentation Form: vector digital data
Entity Attribute Detail Citation:

None Available

Distribution Liability:

The data represent the results of data collection and processing per contract specifications and indicates the general existing conditions at the time of the data collection. As such, it is only valid for its intended use, content, time, and accuracy specifications. The user is responsible for the results of any application of the data for other than its intended purpose.

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

Data Set Credit: Brian Mayfield, Atlantic Group, LLC Jochen Floesser, Atlantic Group, LLC, The Atlantic Group, LLC

Support Roles

Data Steward

CC ID: 779148
Date Effective From: 2018
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: 779149
Date Effective From: 2018
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: 779150
Date Effective From: 2018
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: 779151
Date Effective From: 2018
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: 1141669
W° Bound: -87.688385
E° Bound: -86.612631
N° Bound: 31.440959
S° Bound: 30.824268

Extent Group 1 / Time Frame 1

CC ID: 1141663
Time Frame Type: Discrete
Start: 2013-01-22

Extent Group 1 / Time Frame 2

CC ID: 1141664
Time Frame Type: Discrete
Start: 2013-01-23

Extent Group 1 / Time Frame 3

CC ID: 1141665
Time Frame Type: Discrete
Start: 2013-01-24

Extent Group 1 / Time Frame 4

CC ID: 1141666
Time Frame Type: Discrete
Start: 2013-01-25

Extent Group 1 / Time Frame 5

CC ID: 1141667
Time Frame Type: Discrete
Start: 2013-01-27

Extent Group 1 / Time Frame 6

CC ID: 1141668
Time Frame Type: Discrete
Start: 2013-01-31

Spatial Information

Spatial Resolution

Horizontal Distance: 0.6 Meter

Spatial Representation

Representations Used

Vector: Yes

Vector Representation 1

CC ID: 779339
Point Object Present?: Yes
Point Object Count: 10406865312

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for custom downloads

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.

Distribution Information

Distribution 1

CC ID: 779160
Start Date: 2018
End Date: Present
Download URL:
File Name: Customized Download

Create custom data files by choosing data area, product type, map projection, file format, datum, etc. A new metadata will be produced to reflect your request using this record as a base.

Compression: Zip

Distribution 2

CC ID: 779161
Start Date: 2018
End Date: Present
Download URL:
File Name: Bulk Download

Bulk download of data files in LAZ format, geographic coordinates, orthometric heights. Note that the vertical datum (hence elevations) of the files here are different than described in this document.

File Type (Deprecated): LAZ
Distribution Format: LAS/LAZ - LASer
Compression: Zip



CC ID: 779144
Name: NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV)
URL Type:
Online Resource
File Resource Format: HTML

The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U.S. and its territories. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. An email provides a link to the customized data, while the original data set is available through a link within the viewer.


CC ID: 779145
Name: Browse graphic
URL Type:
Browse Graphic
File Resource Format: KML

This graphic displays the footprint for this lidar data set.


CC ID: 779146
Name: Dataset report
URL Type:
Online Resource
File Resource Format: PDF

Link to data set report.


CC ID: 779337
Name: Breaklines file
URL Type:
Online Resource
File Resource Format: zip

Zip containing shapefiles for the breaklines.

Technical Environment


GIS or remote sensing software is required to use the data.

Data Quality

Horizontal Positional Accuracy:

LiDAR data horizontal accuracy is contracted to meet a 1.0 meter (RMSE) or better. Test that produced the valued: Horizontal point accuracy is a function of angular origination of the pulse; IMU orientation; the scanner encoder and ranging function and will vary depending on the proposed point density selected for the collection. Statistically, the error is roughly 1/3 of the illuminated foot print on the ground and is a function of the beam divergences.

Vertical Positional Accuracy:

LiDAR vertical data accuracy determination shall employ the National Standard for Spatial Data Accuracy (NSSDA). Contracted to meet 12.5 cm (RMSE) or better on open bare terrain and 37.0 cm (RMSE) or better in vegetative areas.

Qualitative value: 8.5 cm at 95% confidence

Test that produced the value: Based on the vertical accuracy testing conducted by The Atlantic Group, LLC using NSSDA methodology, the dataset for Escambia County, AL, tested 8.5 cm vertical accuracy at 95% confidence level in open terrain, based on open terrain.

Completeness Report:

LIDAR raster data is visually inspected for completeness to ensure that any gaps between flight lines of required collection area. LIDAR is self-illuminating and has minimal cloud penetration capability. Water vapor in steam plumes or particulates in smoke may cause reflection of LIDAR signals and loss of elevation information beneath these plumes. Glass structures and roofs may appear transparent to the LIDAR signal and therefore may not register on the reflective surface.

Conceptual Consistency:

Bare-earth processed data for this acquisition block comply with the following accuracy requirements for Artifact/Feature removal: artifacts - 90%; outliers - 95%; vegetation - 95%; buildings - 98%. All LAS formatted LIDAR data are validated using commercial GIS software to ensure proper formatting and loading before delivery. This validation procedure ensures that data on delivery media is in correct physical format and is readable.



Airborne LiDAR Flight Details

CC ID: 1141655
Publish Date: 2013-01-01
Extent Type: Discrete
Extent Start Date/Time: 2013-12-16
Scale Denominator: 1500
Source Contribution:

.las format files that hold all elevation values and associated attributes

Process Steps

Process Step 1

CC ID: 1141656

The ABGPS, IMU, and raw Optech LiDAR data are integrated into the Optech post processor software. The resultant file is in a LAS binary file format. The LAS file version 1.2 format can be easily transferred from one file format to another. It is a binary file format that maintains information specific to the LiDAR data (return#, intensity value, xyz, etc.). The resultant points are produced in the geodetic coordinates referenced to the NAD83 horizontal datum and GRS80 vertical datum.

Process Date/Time: 2013-10-01 00:00:00

Process Step 2

CC ID: 1141657

The initial step of calibration is to verify availability and status of all needed GPS and Laser data against field notes and compile any data if not complete. Subsequently the mission points are output using Leica's ALS Post Processor, initially with default values from Leica or the last mission calibrated for the system. The initial point generation for each mission calibration is verified within Terrascan using a distance colored point cloud to identify errors. If a calibration error greater than specification is observed within the mission, the roll, pitch and scanner scale corrections that need to be applied are calculated. The missions with the new calibration values are output again and validated internally to ensure quality. Once validated each output mission is imported into the Geocue software package. Here a project level supplementary coverage check is carried out to ensure no data voids unreported by Field Operations are present.

Process Date/Time: 2013-10-15 00:00:00

Process Step 3

CC ID: 1141658

Conversion from Geodetic coordinates NAD83 into State Plane coordinates using NAD83 and conversion from ellipsoid heights (meters) into orthometric heights using NAVD88 (US Foot).

Process Date/Time: 2013-11-01 00:00:00

Process Step 4

CC ID: 1141659

The unedited data are classified to facilitate the application of the appropriate feature extraction filters. A combination of proprietary filters is applied as appropriate for the production of bare earth digital terrain models (dtms). Interactive editing methods are applied to those areas where it is inappropriate or impossible to use the feature extraction filters, based upon the design criteria and/or limitations of the relevant filters. These same feature extraction filters are used to produce elevation height surfaces. The LiDAR mass points were delivered in American Society for Photogrammetry and Remote Sensing LAS 1.2 format. The header file for each dataset is complete as define by the LAS 1.2 specification. The data was classified as follows: Class 1 = Unclassified. This class includes all non-ground classified points. Class 2 = Ground. Class 7 = Low Points. Class 9 = water. Class 10 - breakline proximity. Class 12 = Overlap.

Process Date/Time: 2013-12-01 00:00:00

Process Step 5

CC ID: 1141660

NOAA OCM obtained the data from the USGS. Data were converted to geographic coordinates and ellipsoid heights for ingest into the Data Access Viewer system. Ellipsoid heights were obtained by removing the GEOID12a model. Heights were converted to meters. The file format was changed to LAZ using the laszip program for compression.

Process Date/Time: 2018-09-18 00:00:00
Process Contact: Office for Coastal Management (OCM)

Acquisition Information


Instrument 1

CC ID: 1141661
Identifier: Leica ALS70-HP
Instrument / Gear: Instrument
Instrument Type: Topographic Lidar

A 500 Khz pulse rate lidar system operating with a 1064 nm laser. Designed for general-purpose mapping at the flying heights commonly used for for corridor, urban, flood plain or other airborne mapping. At high altitude, can produce a swath width of nearly 8 km.

Catalog Details

Catalog Item ID: 53814
GUID: gov.noaa.nmfs.inport:53814
Metadata Record Created By: Kirk Waters
Metadata Record Created: 2018-09-18 09:55+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-10-17 16:12+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