gov.noaa.csc.maps:md2004 Spatial Systems Associates, Inc. 20050120 model Maryland LIDAR 2005 Annapolis, Maryland Maryland Department of Natural Resources 1. The Sanborn Map Company, Inc. (flight firm) 2. Computational Consulting Services, LLC (processing firm) 3. Spatial Systems Associates, Inc. (post-processing firm) 4. Dewberry & Davis (QA/QC firm) <http://dnrweb.dnr.state.md.us/gis/data/lidar> Light Detection and Ranging (LIDAR) is a method of locating objects on the ground using aerial-borne equipment. It is similar to RADAR or SONAR in that the two-way travel time of an energy beam reflected off an object is precisely measured, but this technology uses laser light instead of radio or sound waves. This technology has proven very useful in remote sensing of the earth. It can be used for determining elevations of both the earth's surface and items (natural and man-made) on the surface. Analysis of LIDAR data is used in detailed modeling of the earth's surface for drainage and floodplain studies, determining how a new structure will affect views from various locations, shoreline erosion studies, and other reasons. The Bare Earth Mass Points are point elevations that represent the "bare earth." Features that are above the ground - such as buildings, bridges, tree tops, etc. - have been eliminated. The LIDAR-derived data were collected by the Maryland Department of Natural Resources in support of shore erosion studies along the shorelines of the Chesapeake Bay. It also supports the Federal Emergency Management Agency's specifications for mapping floodplains. These efforts required detailed elevation data and models, such as those available from LIDAR sensing. The data have also been made available to aid in other projects that require detailed surface, vegetation and/or structure elevations. These data are part of a suite of spatial data products generated using the LIDAR technology. First and Last returns are generated. From these data, Bare-Earth Mass Points that represent the earths surface are produced. A gridded Digital Elevation Model (DEM) is produced from the Bare Earth Mass Points. Imagery is also created that represents the intensity of the LIDAR return; it is a 1-meter resolution product that resembles a panchromatic Digital Orthophoto Quad (DOQ). 200404 Unknown 200405 Unknown ground condition In work None planned -76.472538 -75.297853 39.124828 37.881527 MMRG elevation DNR General terrain model bald earth bare earth DEM Digital Elevation Model elevation and derived products DNR elevation model first return gridded DEM last return LIDAR surface model Maryland Maryland USA Unless downloaded from the Internet, these data are distributed on DVD-ROM discs (specifically, DVD-R format for recorded DVD-ROMs) or via external hard disk. As such, access to a DVD-ROM drive capable of reding DVD-R discs or a computer with Firewire or USB connections and compatible operating system is required. The Department of Natural Resources makes no warranty, expressed or implied, as to the use or appropriateness of Spatial Data, and there are no warranties of merchantability or fitness for a particular purpose or use. The information contained in Spatial Data is from publicly available sources, but no representation is made as to the accuracy or completeness of Spatial Data. The Department of Natural Resources shall not be subject to liability for human error, error due to software conversion, defect, or failure of machines, or any material used in the connection with the machines, including tapes, disks, CD-ROMs or DVD-ROMs and energy. The Department of Natural Resources shall not be liable for any lost profits, consequential damages, or claims against the Department of Natural Resources by third parties. The liability of the Department of Natural Resources for damage regardless of the form of the action shall not exceed any distribution fees that may have been paid in obtaining Spatial Data. Ken Miller Maryland Department of Natural Resources Chief. Watershed Information Services Division mailing and physical address

Tawes State Office Building E-2 580 Taylor Avenue

Annapolis Maryland 21401-2397 USA 410-260-8751 410-260-8835 410-260-8759 kenmiller@dnr.state.md.us 0800 - 1700 Monday to Friday (Eastern Time) Spatial Systems Associates, Inc. was the prime contractor for this project. It partnered with Sanborn Map Company, Inc., Computational Consulting Services, Inc., NXL Construction Services, Inc and Dewberry LLC. Charles County participated with DNR and its vendor. A variety of specialized hardware and software platforms were used to collect, process and quality assess these data. Typically, Intel machines running Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4. Spatial Systems Associates, Inc. 20031130 model Maryland LIDAR 2003 Annapolis, Maryland Maryland Department of Natural Resources 1. Airborne 1, Inc. (flight firm) 2. Computational Consulting Services, LLC (processing firm) 3. Spatial Systems Associates, Inc. (post-processing firm) 4. Dewberry & Davis (QA/QC firm) <http://dnrweb.dnr.state.md.us/gis/data/lidar> Spatial Systems Associates, Inc. 20050120 Unknown vector digital data Maryland LIDAR 2005 Annapolis, Maryland Maryland Department of Natural Resources 1. The Sanborn Map Company, Inc. (flight firm) 2. Computational Consulting Services, LLC (processing firm) 3. Spatial Systems Associates, Inc. (post-processing firm) 4. Dewberry & Davis (QA/QC firm) <http://www.msgic.state.md.us/techtool> Spatial Systems Associates, Inc. 20050120 model Maryland LIDAR 2005 Annapolis, Maryland Maryland Department of Natural Resources 1. The Sanborn Map Company, Inc. (flight firm) 2. Computational Consulting Services, LLC (processing firm) 3. Spatial Systems Associates, Inc. (post-processing firm) 4. Dewberry & Davis (QA/QC firm) <http://dnrweb.dnr.state.md.us/gis/data/lidar> Spatial Systems Associates, Inc. 20050120 remote-sensing image Maryland LIDAR 2005 Annapolis, Maryland Maryland Department of Natural Resources 1. The Sanborn Map Company, Inc. (flight firm) 2. Computational Consulting Services, LLC (processing firm) 3. Spatial Systems Associates, Inc. (post-processing firm) 4. Dewberry & Davis (QA/QC firm) <http://dnrweb.dnr.state.md.us/gis/data/lidar> There are four (4) attributes in the Bare Earth Mass Points files, representing the horizontal coordinates (easting & northing) and vertical position observed and vertical assigned (see process description). Random inspections were made to assure that each line in the file contained 4 values. Computational Consulting Services, the LIDAR processing vendor used proprietary algorithms to remove features and artifacts in the First and Last Return data that did not reflect true ground elevation. Subsequent quality assurance testing by Dewberry determined that the data met FEMA and MD DNR specifications for both vertical accuracy and other consistencies with accepted standards. The QA report can be accessed at <http://dnrweb.dnr.state.md.us/gis/data/lidar>. Spatial Systems Associates performed various inspections of the data to ensure: that each file contained the points located within that tile; that tiles were completely filled; that the point density per tile was within expected ranges, and that the tiles were correctly named. The horizontal coordinate values were designed to meet NSSDA accuracy for data at 1:2400 scale. The RMSE value of 14.3 cm at the 95% confidence level was determined by an independent accuracy assessment conducted by Dewberry LLC according to the contract specifications. These specifications followed FEMA Appendix A guidelines regarding assessing vertical accuracy. For data accurate to within 18.5 cm RMSE, the guidelines recommended a minimum of 20 independent check points be located in each of 5 different land cover categories: Grass/Ground, High Grass/Crops, Brush/Low Trees, Forest, and Urban/Pavement. A total of 125 points were used for the assessments. These points were surveyed by a licensed land surveyor and provided a positional location and elevation with an accuracy that exceeded the predicted accuracy of the LIDAR data. The entire accuracy reports can be found at <http://dnrweb.dnr.state.md.us/gis/data/lidar>. 14.3 The RMSE value is 14.3 cm. See the Vertical Positional Accuracy Report section for more information. LIDAR Data Acquisition. The Sanborn Map Company, Inc. flew the project area with the LIDAR sensor. Where overlaps between the two series of data occurred, the newer data was used. No attempt at blending the two datasets was made to maintain the highest data integrity. In an effort to permit correlation of the point values with tidal gauge stations, the Sanborn Map Company, Inc. was required to fly tidal shoreline areas during the low tide cycle (slack water _ low tide _ slack water) as predicted by local tide stations. The LIDAR sensor collected raw data that was referenced in UTM. The flight plan on this project included the following specifications to meet the project requirements: *Single pass density - 1.696 square meters per sample; *Average area sampling density -1.272 square meters per sample; *Swath width - 996.76 meters; *Flight altitude -1371 meters (4500 ft); *Flight line spacing - 498.38 meters w/50% overlap; *Scan frequency - 21 Hz; *Firing rate - 25 kHz; *Scan angle - 20 degrees; *Ground speed - 140 knots. When complete, the raw data was delivered to Spatial Systems. Unknown Ken Miller Maryland Department of Natural Resources Chief. Watershed Information Services Division mailing and physical address

Tawes State Office Building E-2 580 Taylor Avenue

Annapolis Maryland 21401-2397 USA 410-260-8751 410-260-8835 410-260-8759 kenmiller@dnr.state.md.us 0800 - 1700 Monday to Friday (Eastern Time) LIDAR Data Processing. Computational Consulting Systems. The First and Last Return data was delivered to CCS in large blocks of data. CCS processed the data using both the First and Last Returns, removed artifacts using automated and manual techniques, reprojected the data into the client-specified X,Y,Z text files using the 1200 meter x 1800 meter tiles, NAD 83 meters, NAVD 88 meters. CCS also generated the Intensity Imagery using the client-specified USGS 3.75' tiling scheme. The data products were delivered to SSA for quality assurance testing, formatting and final delivery. Unknown Ken Miller Maryland Department of Natural Resources Chief. Watershed Information Services Division mailing and physical address

Tawes State Office Building E-2 580 Taylor Avenue

Annapolis Maryland 21401-2397 USA 410-260-8751 410-260-8835 410-260-8759 kenmiller@dnr.state.md.us 0800 - 1700 Monday to Friday (Eastern Time) LIDAR Data Post Processing. Spatial Systems Associates. SSA digitized the shoreline from the Intensity Imagery for the purposes of delineating a shoreline. Any LIDAR points that fell seaward of this shoreline were assigned the value of zero (0). In addition to the shoreline, SSA delineated upland ponds using the same technique and assigned all LIDAR points that fell within the water area the value of the lowest observed point close to the shore. The observed elevation values were not lost _ a fourth field in the data file was added for the assigned value. SSA also performed a variety of QA procedures to determine if the point density was within expected ranges; that each tile was completely filled; that all tiles were accounted for, and that the tiles were named in accordance with client specifications. Unknown Ken Miller Maryland Department of Natural Resources Chief. Watershed Information Services Division mailing and physical address

Tawes State Office Building E-2 580 Taylor Avenue

Annapolis Maryland 21401-2397 USA 410-260-8751 410-260-8835 410-260-8759 kenmiller@dnr.state.md.us 0800 - 1700 Monday to Friday (Eastern Time) LIDAR Data Check Point Surveys. NXL Construction Services. NXL was contracted to acquire the check-points in the 5 different land cover classes. SSA provided NXL with maps of each area where a check-point was to be located. The points were scattered throughout the project area. NXL was permitted the latitude to select the exact location based on field conditions, provided the points were generally within a 1 mile radius of the chosen location and that the land cover class was the same as the one specified. The land cover classes were: Grass/Ground, High Grass/Crops, Brush/Low Trees, Forest, and Urban/Pavement. Unknown Ken Miller Maryland Department of Natural Resources Chief. Watershed Information Services Division mailing and physical address

Tawes State Office Building E-2 580 Taylor Avenue

Annapolis Maryland 21401-2397 USA 410-260-8751 410-260-8835 410-260-8759 kenmiller@dnr.state.md.us 0800 - 1700 Monday to Friday (Eastern Time) LIDAR Data Quailty Assurance. Dewberry LLC was provided with the check-point and LIDAR Bare Earth Mass Points data to perform their independent quality assurance work. They performed detailed analyses to determine if the vertical accuracy was within specifications and examined the data for flight, data collection and processing inconsistencies. Neither the flight vendor (Airborne 1) nor the processing vendor (CCS) was given access to the check-point data. The entire accuracy report can be found at <http://dnrweb.dnr.state.md.us/gis/data/lidar>. Unknown Ken Miller Maryland Department of Natural Resources Chief. Watershed Information Services Division mailing and physical address

Tawes State Office Building E-2 580 Taylor Avenue

Annapolis Maryland 21401-2397 USA 410-260-8751 410-260-8835 410-260-8759 kenmiller@dnr.state.md.us 0800 - 1700 Monday to Friday (Eastern Time) The NOAA Coastal Services Center (CSC) received LAS files containing the point cloud elevation data from Earth Data, Inc. CSC performed the following processing on the data to make it available within the Lidar Data Retrieval Tool (LDART): 1. Variable length header records were added to the LAS files to identify projection, datum and sort order. 2. The LFIT (LDART formated binary) files were sorted by latitude. 3. LFIT files were converted to to xyz format ascii files. 2005 Coastal Remote Sensing Program TCM Project Scientist mailing and physical address

2234 South Hobson Avenue

Charleston South Carolina 29405 United States (843) 740-1200 csc@csc.noaa.gov The NOAA National Geophysical Data Center (NGDC) received Lidar data files on external harddrive. The disk contains LiDAR data from the NOAA Coastal Services Center. This data is currently being served via LDART at http://www.csc.noaa.gov/ldart . This data can be used to re-populate the system. The data are provided on this disk in two forms, ascii x,y,z data and also in LAS format. LAS format is an industry standard for serving LiDAR data. The data are exclusively in geographic coordinates, however, the datums used vary. Most is NAD 83, however some is in ITRF. Vertical systems include both ellipsoid (ITRF and NAD 83) and NAVD 88. For NAVD 88 values, Geiod 03 is primarily used; however, data received in NAVD 88 prior to 2003 was processed using Geoid 99. 20060103 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Kelly Stroker Mailing and Physical Address

NOAA/NESDIS/NGDC E/GC1 325 Broadway

Boulder CO 80305-3328 USA (303) 497-4603 (303) 497-6958 (303) 497-6513 kelly.stroker@noaa.gov 7:30-5:00 Mountain Contact Data Center 0 Point Point 3.77269659235446e-08 2.83197892548575e-08 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137 298.257 North American Vertical Datum of 1988 0.001 meters Explicit elevation coordinate included with horizontal coordinates Ken Miller Maryland Department of Natural Resources Chief. Watershed Information Services Division mailing and physical address

Tawes State Office Building E-2 580 Taylor Avenue

Annapolis Maryland 21401-2397 USA 410-260-8751 410-260-8835 410-260-8759 kenmiller@dnr.state.md.us 0800 - 1700 Monday to Friday (Eastern Time) Offline Data None ASCII text files 20021031 DVD-ROM 4.7 Gigabytes DVD-R discs DVD-ROM drives capable of reading DVD-R Please refer to <http://www.msgic.state.md.us/techtool> Please refer to <http://www.msgic.state.md.us/techtool> 1-3 business days after receiving payment. (1) Knowledge of Light Detection And Ranging (LIDAR) imagery is recommended. National Ocean and Atmospheric Administration mailing and physical address

NOAA Coastal Services Center 2234 South Hobson Avenue

Charleston South Carolina 29405-2413 USA (843) 740-1200 (843) 740-1224 csc@csc.noaa.gov Downloadable Data <http://www.csc.noaa.gov/crs/tcm/about_ldart.html> ARCE 1 Visit <http://www.csc.noaa.gov/crs/tcm/about_ldart.html> for additional information Visit <http://www.csc.noaa.gov/crs/tcm/about_ldart.html> for additional information Visit <http://www.csc.noaa.gov/crs/tcm/about_ldart.html> for additional information <http://www.csc.noaa.gov/crs/tcm/about_ldart.html> <http://www.csc.noaa.gov/crs/tcm/about_ldart.html> <http://www.csc.noaa.gov/crs/tcm/about_ldart.html> None DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Kelly Stroker Mailing and Physical Address

NOAA/NESDIS/NGDC E/GC1 325 Broadway

Boulder CO 80305-3328 USA (303) 497-4603 (303) 497-6958 (303) 497-6513 kelly.stroker@noaa.gov 7:30-5:00 Mountain Contact Data Center Disclaimer While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. The National Geophysical Data Center serves as the archive for this LIDAR data. NGDC should only be contacted for this data if it cannot be obtained from NOAA Coastal Services Center. 20070319 20061204 20071204 Ken Miller Maryland Department of Natural Resources Chief. Watershed Information Services Division mailing and physical address

Tawes State Office Building E-2 580 Taylor Avenue

Annapolis Maryland 21401-2397 USA 410-260-8751 410-260-8835 410-260-8759 kenmiller@dnr.state.md.us 0800 - 1700 Monday to Friday (Eastern Time) FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time