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Short Citation:
OCM Partners, 2023: 2014 Mobile County, AL Bare Earth DEM, https://www.fisheries.noaa.gov/inport/item/49414.

Item Identification

Title: 2014 Mobile County, AL Bare Earth DEM
Short Name: al2014_mobile_dem_m5169_metadata
Status: Completed
Publication Date: 2016-12-15
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. Digital Elevation Models (DEMs) created from the lidar data

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:

12072

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None Alabama
None Mobile County

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
Mobile Mobile County, AL

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: Image (digital)
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.

Data Set Credit: Chris Cannon, Production Manager (Atlantic), James L. Taylor, Project Manager (Atlantic), Jochen A. Floesser, PMP, PG GISP- Senior Vice President (Atlantic), Brian Mayfield, CP, GISP, SP,GIS-President & Chief Operations Officer (Atlantic), Scott Kearney, GIS Manager (City of Mobile)

Support Roles

Data Steward

CC ID: 661270
Date Effective From: 2016-12-15
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: 661272
Date Effective From: 2016-12-15
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

Metadata Contact

CC ID: 661273
Date Effective From: 2016-12-15
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: 661271
Date Effective From: 2016-12-15
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: 1150052
W° Bound: -88.441916
E° Bound: -87.919427
N° Bound: 31.203599
S° Bound: 30.194669

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Grid Representation 1

CC ID: 661260
Dimension Count: 3
Cell Geometry: Point
Transformation Parameters Available?: No

Axis Dimension 1

Dimension Type: Row
Size: 3000

Axis Dimension 2

Dimension Type: Column
Size: 3000

Axis Dimension 3

Dimension Type: Vertical
Size: 1

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: 720753
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5169
Distributor:
File Name: Customized Download
Description:

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

Distribution 2

CC ID: 720754
Download URL: https://coast.noaa.gov/htdata/raster2/elevation/Mobile_DEM_2014_5169
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 720756
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 720757
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 720758
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/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: 661286
Activity Date/Time: 2016-12-14
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 661285
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: 718169
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 720755
Activity Date/Time: 2018-02-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

Collection of LAS file containing high resolution elevation data attributes | Quantitative Value: Projection Consistency | Quantitative Test Explanation: ArcMap 10.1 was used to validate that the correct projection information was applied to each image.

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: 0.09 meters, Test that produced the value: 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;

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% (030 ft RMSEZ)

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

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

Ninety-Five (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 Fundamental Vertical Accuracy (FVA) at ninety-five percent confidence level in open terrain using RMSE(z) x 1.9600.

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 ninety-five percent confidence level, using RMSE(z) x 1.9600.; Quantitative Value: 0.156 meters, Test that produced the value: Vertical_Positional_Accuracy_Explanation: 0.511 foot (0.156 meter) Vertical Accuracy (FVA): 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:

Mobile County, Alabama

Conceptual Consistency:

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

Lineage

Sources

Mobile County LiDAR & Bare Earth DEM

CC ID: 1150042
Publish Date: 2014-11-25
Source Contribution:

LiDAR, DEM, Contour | Source Geospatial Form: LAS | Type of Source Media: Portable Hard Drive

Process Steps

Process Step 1

CC ID: 1150043
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: 1150044
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 12th 2014 through January 22th 2014.

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

Process Step 3

CC ID: 1150045
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-low-points/noise, 9-water

Process Date/Time: 2014-10-20 00:00:00

Process Step 4

CC ID: 1150046
Description:

GIS Development Products:

-Hydro-line Collection: Hydro breaklines were compiled using LiDAR Intensity data and surface model of the project area. After the completion of breaklines, they were validated and encoded into the LiDAR surface and used to hydro-enforce/flatten all significant water bodies.

-Terrain Creation: Terrain surface was created using hydro breaklines and bare ground LiDAR.

-ESRI DEM Creation: ESRI DEMs were created from the breaklines and bare-earth (ground) LiDAR data. DEM were created at 2ft resolution and tiled to client Index. Mobile county bare-earth DEM dataset produced from algorithmically thinned bare-earth ground classified lidar point cloud.

Process Date/Time: 2014-11-25 00:00:00

Process Step 5

CC ID: 1150047
Description:

The NOAA Office for Coastal Management (OCM) received the files from the City of Mobile GIS office. The files were ingested into the Digital Coast Data Access Viewer (DAV) system and this metadata record was modified to correct errors and reflect distribution through the DAV system.

Process Date/Time: 2016-12-14 00:00:00

Catalog Details

Catalog Item ID: 49414
GUID: gov.noaa.nmfs.inport:49414
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:13+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