Short Citation:
Office for Coastal Management, 2021: 2014 Mobile County, AL Lidar, https://www.fisheries.noaa.gov/inport/item/48145.

Item Identification

Title: 2014 Mobile County, AL Lidar
Short Name: al2014_mobile_county_m4966_metadata
Status: Completed
Publication Date: 2015-12-09
Abstract:

Atlantic was contracted to acquire high resolution topographic LiDAR (Light Detection and Ranging) data

located in Mobile County, Alabama. The intent was to collect one (1) Area of Interest (AOI) that

encompasses Mobile County. The total client defined AOI was 1,402 square miles or 3,361

square kilometers. The data were collected from January 12 - 22, 2014. Classifications of data available from NOAA OCM are: 1 (Unclassified, 2 (Ground), 3 (Low Vegetation), 7 (Low Noise), 8 (Model Key Points), 9 (Water), 10 (Ignored Ground, Breakline Proximity). Low vegetation points were removed as they were incorrect and not required for delivery.

Digital Elevation Models (DEMs) created from this lidar data are available for download. They are available at: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5169 . Breaklines are available at: https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/4966/supplemental/breaklines

Original contact information:

Contact Name: Scott Kearney

Contact Org: City of Mobile

Phone: (251) 208-7942

Email: kearney@cityofmobile.org

Purpose:

Mobile County, Alabama requires efficient data to effectively plan and manage county infrastructure. This dataset was developed to support Mobile County. The scope involved the acquisition of USGS Quality Level 2 LiDAR data to be processed, classified to produce a new countywide DEM and one foot elevation contours for the entire 1402 square mile Mobile County Project Area.

Notes:

10168

Supplemental Information:

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

https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/4966/supplemental/al2014_mobile_county_m4966.kmz

Reports for this data set may be viewed at:

https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/4966/supplemental/al2014_mobile_county_m4966_lidarreport.pdf https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/4966/supplemental/al2014_mobile_county_m4966_surveyreport.pdf https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/4966/supplemental/al2014_mobile_county_m4966_acquisitionreport.pdf

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords Earth Science > Land Surface > Topography > Terrain Elevation > Topographical Relief Maps
Global Change Master Directory (GCMD) Science Keywords Earth Science > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
Global Change Master Directory (GCMD) Science Keywords Earth Science > Oceans > Coastal Processes > Coastal Elevation
ISO 19115 Topic Category elevation
None Alabama
None Bathymetry/Topography
None LAS
None LiDAR
None Mobile County
None Topography

Temporal Keywords

Thesaurus Keyword
None 20140112
None 20140122

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords Continent > North America > United States Of America > Alabama
Mobile County Alabama

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
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of Atlantic, City and County of Mobile, NOAA, the Office for Coastal Management or its partners.

Support Roles

Data Steward

CC ID: 622398
Date Effective From: 2015-12-09
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 622400
Date Effective From: 2015-12-09
Date Effective To:
Contact (Organization): Office for Coastal Management (OCM)
Address: 2234 South Hobson Avenue
Charleston, SC 29405-2413
URL: https://www.coast.noaa.gov/

Metadata Contact

CC ID: 622401
Date Effective From: 2015-12-09
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 622399
Date Effective From: 2015-12-09
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 622404
W° Bound: -88.441916
E° Bound: -87.919427
N° Bound: 31.203599
S° Bound: 30.194669

Extent Group 1 / Time Frame 1

CC ID: 622403
Time Frame Type: Range
Start: 2014-01-12
End: 2014-01-22

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:

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=4966

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

Data Access Constraints:

None

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: 743626
Start Date: 2019-07-01
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=4966
Distributor: Office for Coastal Management (OCM) (2015-12-09 - Present)
File Name: Customized Download
Description:

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

File Type: Zip

Distribution 2

CC ID: 743627
Start Date: 2019-07-01
End Date: Present
Download URL: https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/4966
Distributor: Office for Coastal Management (OCM) (2015-12-09 - Present)
File Name: Bulk Download
Description:

Simple download of data files.

File Type: LAZ

URLs

URL 1

CC ID: 743629
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 743630
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 743631
URL: https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/4966/supplemental/al2014_mobile_county_m4966.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage in Mobile County Alabama from the 2014 collection.

Activity Log

Activity Log 1

CC ID: 622420
Activity Date/Time: 2016-12-15
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 622419
Activity Date/Time: 2017-11-14
Description:

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

Activity Log 3

CC ID: 717600
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 743628
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

All work was done in coordination with Mobile County Contract. | Quantitative Value: Projection ConsistencyFile Format | Quantitative Test Explanation: Global Mapper ver.11.02 was used to validate that the correct projection information was applied to each image.Image Station Raster Utility - Display Header application was used to validate file format parameters such as:

4-band, 8-bits per band (RGBI), and pixel readout starts in northwest corner as (0,0).

Horizontal Positional Accuracy:

LiDAR Horizontal Accuracy of the bare-earth data was assessed and reported in accordance with the guidelines developed by the NDEP and subsequently adopted by the ASPRS;; Quantitative Value: 0.095 meters, Test that produced the value: LiDAR Horizontal Accuracy (in meters) of the bare-earth data was assessed and reported in accordance with the guidelines developed by the NDEP and subsequently adopted by the ASPRS;

Vertical Positional Accuracy:

LiDAR Vertical Accuracy of the bare-earth data was assessed and reported in accordance with the guidelines developed by the NDEP and subsequently adopted by the ASPRS;

- FVA<= 0.60 ft ACCZ, 95% (0.30 ft RMSEZ)

- CVA<= 0.80 ft ACCZ, 95% (0.41 ft RMSEZ)

- SVA<= 0.80 ft ACCZ, 95% (0.41 ft RMSEZ)

One hundred and eleven (111) surveyed points were measured for the purpose of assessing the accuracy of the Mobile County data.

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Tested 0.511 US Survey Foot (0.156 m) Fundamental Vertical Accuracy (FVA) at ninety-five percent confidence level in open terrain using RMSE(z) x 1.9600. RMSEz = 7.9 cm.

Tested 0.457 US Survey Foot Consolidated Vertical Accuracy (CVA) at ninety-five percent confidence level, using RMSE(z) x 1.9600.

Tested 0.372 US Survey Foot Supplemental Vertical Accuracy (SVA) at; Quantitative Value: 0.079 meters, Test that produced the value: Tested 0.511 US Survey Foot (0.156 m) Fundamental Vertical Accuracy (FVA) at ninety-five percent confidence level in open terrain using RMSE(z) x 1.9600. RMSEz = 7.9 cm. The data meets the expected vertical accuracy of 0.6ft, @ ninety-five percent confidence level, using RMSE(z) x 1.9600,. as stated in the project contract.

Completeness Measure:

Cloud Cover: 0

Completeness Report:

This data set covers the spatial extent of topographic lidar data obtained during this survey.

Conceptual Consistency:

Topological integrity of the data was validated using the validation tools in ESRI's ArcGIS 10.1.

Lineage

Sources

Mobile County LiDAR

CC ID: 622386
Contact Name: Atlantic
Publish Date: 2014-10-21
Extent Type: Discrete
Extent Start Date/Time: 2014-10-21
Scale Denominator: 1200
Source Contribution:

LiDAR, Digital Elevation Model, Breaklines | Source Geospatial Form: LAS | Type of Source Media: Portable HardDrive

Process Steps

Process Step 1

CC ID: 622387
Description:

Ground Control This Geodetic Control Survey was conducted to support Light Detection and Ranging (LiDAR) data in accordance with the National Digital Elevation Program (NDEP) and the American Society for Photogrammetry and Remote Sensing (ASPRS) guidelines. A GPS control network was performed for the purposes of establishing a three-dimensional coordinates on each of the base station locations. The control network included a combination of a National Geodetic Survey (NGS) Control Monument (MOB AP STA A1), National Geodetic Survey (NGS) CORS (AL84, AL90, AL92, ALDI, ALM) ,Mobile Control Monuments (MCC1062, MCC1067, MCC1070, MCC1072, MCC1073, MOB1000, MOB1008, MOB1009, MOB1011, MOB1023, MOB1031, MOB1034) and a capped iron found (CIPF). GPS observations at all ground control points in the network were made with Leica System 500 dual frequency GPS-receivers w/ Leica AT502 antenna and a NovAtel DL 4=L1L2 receiver w/ NovAtel NOV702 3.00 antenna between April 30, 2014 and May 2, 2014.

Process Date/Time: 2014-05-10 00:00:00

Process Step 2

CC ID: 622388
Description:

Aerial LiDAR Acquisition: Aerial data collection was acquired, in one (9) mission, using the ALS70 SN# 7123 at an altitude of 5500 ft. MSL. This was to support a 2.0 ppm^2 LiDAR point cloud. Airborne GPS and IMU data was collected during the acquisition and supported by Topcon Viper GPS base station that occupied NGS monument MOBARP. Data acquisition was collected January 12, 2014 through January 22, 2014.

Process Date/Time: 2014-01-22 00:00:00

Process Step 3

CC ID: 622389
Description:

LIDAR PROCESSING:

- LiDAR Calibration:Initial processing of the GPS data was processed using Inertial Explorer. The solution file was generated and ALSPP software was used to generate georeferenced laser returns which were then processed in strip form allowing for the QC of the overlap between strips (lines). The data from each line were combined and automated classification routines run to determine the initial surface model. This initial surface model was then verified to the LiDAR test points.

LiDAR Classification: The calibrated LiDAR data was run through automated classification routines and then manually checked. The data was classified into the following classes: 1-unclassified, 2-ground, 3-lowpoints/noise, 9-water

Process Date/Time: 2014-06-11 00:00:00

Process Step 4

CC ID: 622390
Description:

The NOAA Office for Coastal Management (OCM) received the files in las format from the City of Mobile GIS office. The files contained lidar elevation and intensity measurements. The data were in Alabama State Plane West coordinates (0102, feet) and NAVD88 heights (Geoid12A, feet). OCM performed the following processing for data storage and Digital Coast provisioning purposes:

1. LAS files were compressed to laz format using laszip.

2. Elevation outliers were eliminated, above 2,000 ft and below -50 ft, as these were deemed erroneous.

3. Class 3 (low vegetation) was removed as it was not part of the project specifications, furthermore these points were found to only be located in open water.

4. Reclassified all Class 11 points to Class 15 as this does not match the NOAA OCM classification scheme.

5. Data were converted from Alabama State Plane West coordinates (ft) with NAVD88 heights (ft) to geographic coordinates (decimal degrees) with ellipsoid heights (m).

Process Date/Time: 2015-11-30 00:00:00
Process Contact: Office for Coastal Management (OCM)
Source: Mobile County LiDAR

Catalog Details

Catalog Item ID: 48145
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-14 14:19+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2019-07-02 15:17+0000
Metadata Record Published: 2018-04-11
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2019-04-12