20150715130743001.0FGDC CSDGM MetadataTRUE2013021815061700file://\\tagwork31\d\13_165_Mobile_USGS_Corrections_June2015\Metadata\Corrected\Mobile_County_DEM (1)Local Area NetworkAtlantic20150715UnknownMobile County Breaklines1vector digital dataEnglishMobile County BreaklinesMobile 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. Delineation of significant hydrological features based on USGS specifications was completed through the collection of breaklines. These breaklines were then utilized in the creation of DEMs and one foot elevation contours.Data are to be used by Mobile County personnel only unless a written request to the County POC has been approved.Users must abide by the terms of the non-disclosure agreement or the data sharing agreement under which the geospatial data were obtained.Mobile county bare-earth DEM dataset produced from algorithmically thinned bare-earth ground classified lidar point cloud.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)Microsoft Windows Office 2003 Service Pack 3; ESRI ArcCatalog 10.1Shape-ESRI Shape File Formatmailing and physical addressMobileAL 36602United States205 Government St., Suite 452 S215 South 9th Street8:00 a.m. - 5:00 p.m.Weekdays (Mon. - Fri.)City of MobileScott Kearney(251) 208-7942kearney@cityofmobile.orgGIS Manager20141125ground conditionMobile CountyAlabamaLiDARLASDigital Elevation ModelContoursOne Foot ResolutionMobileMobileMobile County, ALAs needed-88.441916 -87.91942731.20359930.1946691400014500None AvailableNone AvailableNone Availablefile://\\Gissrv\GIS1\GIS\Zac's Metadata Things\12-126-New Orleans Orthos\Butler_OrthoLocal Area NetworkMobile County BreaklinesAtlantic20150715Unknownvector digital data120141125ground conditionPortable Hard DriveMobile CountyLiDAR, DEM, Contour1200Associate Vice President, Production Operationsmailing and physical address2223 Drake Ave. SW, Suite 200HuntsvilleAL35805United States 256.971.9991256.971.1154jccannon@theatlgrp.comAtlanticChris CannonMonday through Friday 8:00 AM to 5:00 PM (Central Time)If unable to reach the contact by telephone, please send an emailGround 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. 20140510GrafNet 8.30.2105AtlanticScott JonesMissions Operations Managermailing and physical address2223 Drake Ave. SW, Suite 200HuntsvilleAL35805United States256.971.9991256.971.1154srjones@theatlgrp.comAerial 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 2014.20140122AtlanticJared MartinSenior LiDAR Analystmailing and physical address2223 Drake Ave. SW, Suite 200HuntsvilleAL35805United States256-971-9991256-971-1154jmartin@theatlgrp.comLIDAR 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-water20141020nertial Explorer 8.5, ALSPP 2.75, TerraScan 14.015, TerraModel 14.002, TerraMatch 14.007, GeoCue 2013.1.45AtlanticChris CannonAssociate Vice President, Production Operationsmailing and physical address2223 Drake Ave. SW, Suite 200HuntsvilleAL35805United States256-971-9991256-971-1154jccannon@theatlgrp.comGIS 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.ArcMap 10.120141125All breaklines in the Mobile County area were collected using ArcMap 10.1 and guided by the standard USGS spec of 100 ft. minimum average width for rivers and streams and 2 acre minimum area for ponds and lakes. Breaklines were submitted to an intensive QC process, checking for missing features, inaccurate collection, vertical variance, monotonicity, and feature overlap. 3D values for rivers and streams were added using downhill conflation method in LP 360 to ensure that all Z values followed a consistent downhill constraint. 3D values for ponds and lakes were added using LP 360 to assign minimum Z value to all values. 0All breaklines in the Mobile County area were collected using ArcMap 10.1 and guided by the standard USGS spec of 100 ft. minimum average width for rivers and streams and 2 acre minimum area for ponds and lakes. Breaklines were submitted to an intensive QC process, checking for missing features, inaccurate collection, vertical variance, monotonicity, and feature overlap. 3D values for rivers and streams were added using downhill conflation method in LP 360 to ensure that all Z values followed a consistent downhill constraint. 3D values for ponds and lakes were added using LP 360 to assign minimum Z value to all values.1The hydroline shapefiles included all hydro features in the Mobile County area. A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist. The shapefile is of good quality and data has passed extensive QA/QC processes.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. Vertical_Positional_Accuracy_Explanation: 0.511 foot 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.0.511 footLiDAR 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;0.311 footLiDAR 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;The hydroline shapefiles included all hydro features in the Mobile County area. A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist. The shapefile is of good quality and data has passed extensive QA/QC processes.20150715mailing and physical addressHuntsvilleAlabama35805United States2223 Drake Ave. SW, Suite 200Associate Vice President, Production Operations256-971-9991jccannon@theatlgrp.comAtlanticChris Cannon8:00 a.m. - 5:00 p.m.256-971-115420150715englishFGDC Content Standards for Digital Geospatial MetadataArc Catalog 10.1local timeNone AvailableNone AvailableNone AvailableUnclassifiedNone Available2015071520121206VectorArea chainState Plane Coordinate System 19830102 0.99996 -87.530.0 1968500.00.0survey feetrow and column0.30480060960121920.3048006096012192NAD_1983_StatePlane_Alabama_West_FIPS_0102_FeetGCS_North_American_1983North American Datum of 1983Geodetic Reference System 806378137.0298.257222101North American Vertical Datum of 1988feetExplicit elevation coordinate included with horizontal coordinates800Collection of . LAS file containing high resoluition elevation data attributesCollection of . LAS file containing high resoluition elevation data attributes205 Government St., Suite 452 Smailing and physical addressMobileAL36602United StatesCity of MobileScott KearneyGIS Manager(251) 208-7942kearney@cityofmobile.orgThis dataset is an ESRI shapefile, developed for Mobile County, Alabama.The data represented is the result 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.None AvailableContact Scott Kearney
GIS Manager
City of Mobile
205 Government St., Suite 452 S
Mobile, AL 36602
Email: kearney@cityofmobile.org
Tel:(251) 208-7942None AvailableContact Scott Kearney
GIS Manager
City of Mobile
205 Government St., Suite 452 S
Mobile, AL 36602
Email: kearney@cityofmobile.org
Tel:(251) 208-7942None AvailableNone Available20150715