DOC/NOAA/NOS/CSC/CRS > Coastal Remote Sensing Program, Coastal Services Center, National Ocean Service, NOAA, U.S. Department of Commerce
Publication Date:
20061018
Title:
2003 Maryland LIDAR mapping project
Other Citation Details:
1. Airborne 1 (flight firm)2. Computational Consulting Services, LLC (processing firm)3. Spatial Systems Associates, Inc. (post-processing firm)4. Dewberry & Davis (QA/QC firm)5. Maryland Department of Natural Resources
Description:
Abstract:
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 data show the calculated elevation of the earth's surface (the ground, without objects such
as trees or buildings). Mass points may appear to have "holes" with no elevation values in areas
where the surface could not be determined, such as very dense forests or urban areas.
Purpose:
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.
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date:
20020901
Beginning Time:
Unknown
Ending Date:
20030101
Ending Time:
Unknown
Currentness Reference:
ground condition
Status:
Progress:
Complete
Maintenance and Update Frequency:
None planned
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate:
-75.569660
East Bounding Coordinate:
-75.023956
North Bounding Coordinate:
38.468258
South Bounding Coordinate:
37.979873
Keywords:
Theme:
Theme Keyword Thesaurus:
None
Theme Keyword:
mass points
Theme Keyword:
LiDAR
Theme Keyword:
lidar
Theme Keyword:
elevation
Theme Keyword:
DEM
Theme Keyword:
elevation model
Theme Keyword:
digital elevation model
Theme Keyword:
surface model
Theme Keyword:
gridded DEM
Place:
Place Keyword Thesaurus:
None
Place Keyword:
MARYLAND
Place Keyword:
USA
Access Constraints:
none
Use Constraints:
The NOAA and 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.
Point of Contact:
Contact Information:
Contact Organization Primary:
Contact Organization:
Coastal Remote Sensing Program
Contact Position:
TCM Project Scientist
Contact Address:
Address Type:
mailing and physical address
Address:
2234 South Hobson Avenue
City:
Charleston
State or Province:
South Carolina
Postal Code:
29405
Country:
United States
Contact Voice Telephone:
(843) 740-1200
Contact Electronic Mail Address:
csc@csc.noaa.gov
Data Set Credit:
The 2003 Maryland LIDAR data were collected for the Maryland Department of Natural Resources. Spatial Systems Associates, Inc. was the prime contractor for this project. It partnered with Airborne 1 Corporation, Computational Consulting Services, Inc., NXL Construction Services, Inc and Dewberry LLC. The following organizations participated with DNR and its vendor in funding the collecting and processing of the LIDAR data. They are: City of Salisbury, Salisbury University, University of Maryland, Dorchester County, Talbot County and the National Ocean and Atmospheric Administration's (NOAA) Coastal Services Center (CSC).
Cross Reference:
Citation Information:
Originator:
Spatial Systems Associates, Inc.
Publication Date:
20031130
Title:
LIDAR 2003 First_Last Returns
Geospatial Data Presentation Form:
model
Series Information:
Series Name:
Maryland LIDAR
Issue Identification:
2003
Publication Information:
Publication Place:
Annapolis, Maryland
Publisher:
Maryland Department of Natural Resources
Other Citation Details:
1. Airborne 1 (flight firm) 2. Computational Consulting Services, LLC (processing firm) 3. Spatial Systems Associates, Inc. (post-processing firm) 4. Dewberry & Davis (QA/QC firm)
Cross Reference:
Citation Information:
Originator:
Spatial Systems Associates, Inc.
Publication Date:
20031130
Title:
LIDAR 2003 Gridded DEM
Geospatial Data Presentation Form:
model
Series Information:
Series Name:
Maryland LIDAR
Issue Identification:
2003
Publication Information:
Publication Place:
Annapolis, Maryland
Publisher:
Maryland Department of Natural Resources
Other Citation Details:
1. Airborne 1 (flight firm) 2. Computational Consulting Services, LLC (processing firm) 3. Spatial Systems Associates, Inc. (post-processing firm) 4. Dewberry & Davis (QA/QC firm)
Cross Reference:
Citation Information:
Originator:
Spatial Systems Associates, Inc.
Publication Date:
20031130
Title:
LIDAR 2003 Intensity Imagery
Geospatial Data Presentation Form:
remote-sensing image
Series Information:
Series Name:
Maryland LIDAR
Issue Identification:
2003
Publication Information:
Publication Place:
Annapolis, Maryland
Publisher:
Maryland Department of Natural Resources
Other Citation Details:
1. Airborne 1 (flight firm) 2. Computational Consulting Services, LLC (processing firm) 3. Spatial Systems Associates, Inc. (post-processing firm) 4. Dewberry & Davis (QA/QC firm)
Cross Reference:
Citation Information:
Originator:
Spatial Systems Associates, Inc.
Publication Date:
20031130
Title:
LIDAR 2002 Bare Earth Mass Points
Geospatial Data Presentation Form:
model
Series Information:
Series Name:
Maryland LIDAR
Issue Identification:
2002
Publication Information:
Publication Place:
Annapolis, Maryland
Publisher:
Maryland Department of Natural Resources
Other Citation Details:
1. 3Di, Inc. (flight firm) 2. Airborne 1 (flight firm) 2. Computational Consulting Services, LLC (processing firm) 3. Spatial Systems Associates, Inc. (post-processing firm) 4. Dewberry & Davis (QA/QC firm)
Cross Reference:
Citation Information:
Originator:
Maryland Department of Natural Resources
Publication Date:
20040527
Publication Time:
Unknown
Title:
LIDAR03 Other Funding
Publication Information:
Publication Place:
Annapolis, MD
Publisher:
Maryland Department of Natural Resouces
Larger Work Citation:
Citation Information:
Originator:
Spatial Systems Associates, Inc.
Publication Date:
20031130
Title:
LIDAR 2003 Bare Earth Mass Points
Geospatial Data Presentation Form:
model
Series Information:
Series Name:
Maryland LIDAR
Issue Identification:
2003
Publication Information:
Publication Place:
Annapolis, Maryland
Publisher:
Maryland Department of Natural Resources
Other Citation Details:
1. Airborne 1 (flight firm) 2. Computational Consulting Services, LLC (processing firm) 3. Spatial Systems Associates, Inc. (post-processing firm) 4. Dewberry & Davis (QA/QC firm)
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>.
Completeness Report:
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.
Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report:
The horizontal coordinate values were designed to meet NSSDA accuracy for data at 1:2400 scale.
Vertical Positional Accuracy:
Vertical Positional Accuracy Report:
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>.
The RMSE value is 14.3 cm. See the Vertical Positional Accuracy Report section for more information.
Lineage:
Source Information:
Source Citation:
Citation Information:
Originator:
Maryland Department of Natural Resources with Spatial Systems Associates
Publication Date:
20040320
Title:
Elevation Data - LiDAR Bare Earth Mass Points
Publication Information:
Publication Place:
Annapolis, Maryland
Publisher:
Maryland Department of Natural Resources
Type of Source Media:
disc
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date:
20030301
Ending Date:
20031130
Source Currentness Reference:
ground condition
Source Citation Abbreviation:
Elevation data
Source Contribution:
Bare-earth LIDAR x-y-z-i data files
Process Step:
Process Description:
LIDAR Data Acquisition. Airborne 1, using an Optec 25 mHz system, flew the project area with the LIDAR sensor. A portion of the 2003 project area included data acquisition of portions of the LIDAR 2002 project area that had incomplete coverage. 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 Airborne 1 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 specifications called for data collection during leaf-off conditions, which generally run through early to mid April. However, due to late winter snow cover, windy flight conditions and other technical obstacles, data acquisitions continued into early June 2003. In addition, a small area in the north end of the project area was acquired in July. Anticipating the trouble with leaf density, Airborne 1 modified the flight parameters to increase the laser light penetration to the ground. 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.
Process Date:
20040120
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person:
Ken Miller
Contact Organization:
Maryland Department of Natural Resources
Contact Position:
Director, Watershed Information Services
Contact Address:
Address Type:
mailing and physical address
Address:
Tawes State Office Building E-2 580 Taylor Avenue
City:
Annapolis
State or Province:
Maryland
Postal Code:
21401-2397
Country:
USA
Contact Voice Telephone:
410-260-8751
Contact TDD/TTY Telephone:
410-260-8835
Contact Facsimile Telephone:
410-260-8759
Contact Electronic Mail Address:
kenmiller@dnr.state.md.us
Hours of Service:
0800 - 1700 Monday to Friday (EST)
Process Step:
Process Description:
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.
Process Date:
20040120
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person:
Ken Miller
Contact Organization:
Maryland Department of Natural Resources
Contact Position:
Director, Watershed Information Services
Contact Address:
Address Type:
mailing and physical address
Address:
Tawes State Office Building E-2 580 Taylor Avenue
City:
Annapolis
State or Province:
Maryland
Postal Code:
21401-2397
Country:
USA
Contact Voice Telephone:
410-260-8751
Contact TDD/TTY Telephone:
410-260-8835
Contact Facsimile Telephone:
410-260-8759
Contact Electronic Mail Address:
kenmiller@dnr.state.md.us
Hours of Service:
0800 - 1700 Monday to Friday (EST)
Process Step:
Process Description:
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.
Process Date:
20040120
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person:
Ken Miller
Contact Organization:
Maryland Department of Natural Resources
Contact Position:
Director, Watershed Information Services
Contact Address:
Address Type:
mailing and physical address
Address:
Tawes State Office Building E-2 580 Taylor Avenue
City:
Annapolis
State or Province:
Maryland
Postal Code:
21401-2397
Country:
USA
Contact Voice Telephone:
410-260-8751
Contact TDD/TTY Telephone:
410-260-8835
Contact Facsimile Telephone:
410-260-8759
Contact Electronic Mail Address:
kenmiller@dnr.state.md.us
Hours of Service:
0800 - 1700 Monday to Friday (EST)
Process Step:
Process Description:
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.
Process Date:
20040120
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person:
Ken Miller
Contact Organization:
Maryland Department of Natural Resources
Contact Position:
Director, Watershed Information Services
Contact Address:
Address Type:
mailing and physical address
Address:
Tawes State Office Building E-2 580 Taylor Avenue
City:
Annapolis
State or Province:
Maryland
Postal Code:
21401-2397
Country:
USA
Contact Voice Telephone:
410-260-8751
Contact TDD/TTY Telephone:
410-260-8835
Contact Facsimile Telephone:
410-260-8759
Contact Electronic Mail Address:
kenmiller@dnr.state.md.us
Hours of Service:
0800 - 1700 Monday to Friday (EST)
Process Step:
Process Description:
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 with 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>.
Process Date:
20040120
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person:
Ken Miller
Contact Organization:
Maryland Department of Natural Resources
Contact Position:
Director, Watershed Information Services
Contact Address:
Address Type:
mailing and physical address
Address:
Tawes State Office Building E-2 580 Taylor Avenue
City:
Annapolis
State or Province:
Maryland
Postal Code:
21401-2397
Country:
USA
Contact Voice Telephone:
410-260-8751
Contact TDD/TTY Telephone:
410-260-8835
Contact Facsimile Telephone:
410-260-8759
Contact Electronic Mail Address:
kenmiller@dnr.state.md.us
Hours of Service:
0800 - 1700 Monday to Friday (EST)
Process Step:
Process Description:
The NOAA Coastal Services Center (CSC) received ASCII files containing the bared-earth elevation
and intensity data from Maryland Department of Natural Resources. CSC performed the
following processing on the data to make it available within the Lidar Data Retrieval
Tool (LDART):
1. The data were projected from Maryland State Plane coordinates to geographic
decimal degrees using the General Cartographic Transformation Package.
2. The lat, lon, MODZVAL and intensity values where extracted from the ascii files
and converted to the LDART binary format.
3. The data were converted to xyz text files
Process Date:
20040528
Process Contact:
Contact Information:
Contact Organization Primary:
Contact Organization:
Coastal Remote Sensing Program
Contact Position:
TCM Project Scientist
Contact Address:
Address Type:
mailing and physical address
Address:
2234 South Hobson Avenue
City:
Charleston
State or Province:
South Carolina
Postal Code:
29405
Country:
United States
Contact Voice Telephone:
(843) 740-1200
Contact Electronic Mail Address:
csc@csc.noaa.gov
Process Step:
Process Description:
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.
Process Date:
20060103
Process Contact:
Contact Information:
Contact Organization Primary:
Contact Organization:
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Any conclusions drawn from analysis of this information
are not the responsibility of NOAA or the Coastal Services
Center.
Custom Order Process:
This data can be obtained on-line at the following URL:
http://www.csc.noaa.gov/ldart.
Distributor:
Contact Information:
Contact Organization Primary:
Contact Organization:
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Contact Person:
Kelly Stroker
Contact Address:
Address Type:
Mailing and Physical Address
Address:
NOAA/NESDIS/NGDC E/GC1 325 Broadway
City:
Boulder
State or Province:
CO
Postal Code:
80305-3328
Country:
USA
Contact Voice Telephone:
(303) 497-4603
Contact TDD/TTY Telephone:
(303) 497-6958
Contact Facsimile Telephone:
(303) 497-6513
Contact Electronic Mail Address:
kelly.stroker@noaa.gov
Hours of Service:
7:30-5:00 Mountain
Contact Instructions:
Contact Data Center
Distribution Liability:
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.
Custom Order Process:
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.
