Dataset Identification:
- In the spring of 2005, Sanborn as part of the Dewberry team was contracted to execute a LiDAR (Light Detection and Ranging) survey campaign to collect the 3-dimensional positions of a dense set of masspoints for the entire 689 plus square mile project area of Baltimore County, Maryland. These data are suitable for the development of a digital elevation model (DEM) to support orthometric photo rectification and contouring. The lidar first and Last Return value data were obtained from the post processed data and provided in separate files containing all georeferenced First Return and Last Return data in an ASCII comma delimited format to the NOAA Coastal Services Center. For data storage and Digital Coast provisioning purposes, the NOAA Coastal Services Center converted the ascii data to geographic coordinates, ellipsoid heights in meters, and las format and created a bare earth data set using an automated algorithm.
- Title 2005 Baltimore County Maryland Lidar
- publication Date 2012-01-01
- organisation Name DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
- Contact information
-
- Telephone
-
- Voice 843-740-1200
- Address
-
- 2234 South Hobson Ave., Charleston, SC, 29405-2413
- electronic Mail Address coastal.info@noaa.gov
- organisation Name Baltimore County, MD GIS Services
- organisation Name DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
- Contact information
-
- Telephone
-
- Voice 843-740-1200
- Address
-
- 2234 South Hobson Ave., Charleston, SC, 29405-2413
- electronic Mail Address coastal.info@noaa.gov
Theme keywords (theme):
Bathymetry/Topography
Lidar
DEM
Digital Elevation Model
Elevation
Digital Terrain Model
Point cloud data
- Title None
Location keywords:
United States
Maryland
Baltimore County
- Title None
Theme keywords (theme):
- Title Activity > Observation
- publication Date 2017-08-24
Theme keywords (theme):
- Title Organization > GOVERNMENT AGENCIES-U.S. FEDERAL AGENCIES
- publication Date 2017-08-24
Theme keywords (theme):
- Title Method > Information Processing
- publication Date 2017-08-24
Theme keywords (theme):
- Title Feature > Marine Feature
- publication Date 2017-08-24
Theme keywords (theme):
- Title Realm > Earth Surface
- publication Date 2017-08-24
Theme keywords (theme):
- Title Virtual International Authority File (VIAF) Corporate Names
- publication Date 2017-08-24
Theme keywords (theme):
- Title Property > Measure
- publication Date 2017-08-24
Theme keywords (theme):
- Title Feature > Physiographic Feature
- publication Date 2017-08-24
Theme keywords (theme):
- Title Science Domain > Earth Science
- publication Date 2017-08-24
purpose:
Browse image (thumbnail):
- maintenance or update frequency: notPlanned
- Constraints
-
- Use limitation statement:
- These data depict the elevations at the time of the survey and are only accurate for that time. 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. Any conclusions drawn from analysis of this information are not the responsibility of NOAA or any of its partners. These data are NOT to be used for navigational purposes.
- Legal Constraints
-
- Use Limitation
- 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.
Resource extent
-
- westBoundLongitude -76.9156
- eastBoundLongitude -76.3155
- northBoundLatitude 39.7221
- southBoundLatitude 39.1934
Geographic Bounding Box - Temporal Extent
Geographic Extent
2005-03-18
2005-04-15
- The original Lidar Acquisition plan was designed for all East/West flight lines. Due to several Air Traffic Control Restrictions in the southern portion of the County, 54 North/South flight lines were used to acquire the southern portion of the county, minimizing time in restricted airspace. In addition, the Bay Coast line was planned for acquisition within one hour either side of low tide. Due to the same ATC restrictions it was impossible to comply with the low tide requirement for this area.
- organisation Name Baltimore County GIS Services
- Contact information
-
- Telephone
-
- Voice 410.887.2553
- Address
-
- 400 Washington Ave, Towson, Maryland, 21204 Country US
Vector spatial representation information
-
- Geometric Objects
-
- geometric Object Type point
reference system 1
- Reference System Identifier
- Identifier string: urn:ogc:def:crs:EPSG::4269
- authority
-
- Title North American Datum 1983
- alternateTitle NAD83
- revision Date 2007-01-19
- cited responsible party - resourceProvider
-
- organisation Name
- Contact information
-
- Linkage for online resource
-
- name NAD83
- URL: http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4269
- link function information
- Description Link to Geographic Markup Language (GML) description of reference system.
- cited responsible party - publisher
-
- organisation Name European Petroleum Survey Group
- Contact information
-
- Linkage for online resource
-
- name European Petroleum Survey Group Geodetic Parameter Registry
- URL: http://www.epsg-registry.org/
- link function search
- Description Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations.
reference system 2
- Reference System Identifier
- Identifier string: Ellipsoid in Meters
- Identifier code space: Local Vertical Reference
Data quality information
Scope of quality information
- name Of Measure Horizontal Positional Accuracy Report
- evaluation Method Description LIDAR First Return and Last Return data were compared with airport surveyed elevations provided by Kinematic survey. The data and survey were compared and verified per project specifications. The horizontal accuracy of the FR and LR data meets the 15 cm accuracy normally achieved from this flight height and scan resolution for this data set.
- name Of Measure Vertical Positional Accuracy Report
- evaluation Method Description The vertical accuracy of the FR and LR data was checked using LIDAR First Return and Last Return data were compared with airport surveyed elevations provided by Kinematic survey. The data and survey were compared and verified per project specifications. The Fundamental Vertical Accuracy (FVA) tested 21.9 cm (0.72 ft) at the 95% confidence level in open terrain, based on RMSE x 1.96. The RMSE for this data set is 11.2 cm. For more information about the vertical accuracy, please refer to The Report of Vertical Accuracy Testing which may be accessed at: ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/md/2005_Baltimore_County_Lidar_Vertical_Accuracy_Report.pdf
- evaluation Method Description Sanborn and Dewberry performed various inspections of the BE data to ensure that each file contained points within the project limits. Checks for correct tile naming were performed. The BE data generally may contain some voids where insufficient energy was reflected from the surface to generate a valid return from the terrain. Voids tend to occur in heavily vegetated areas, water bodies, and beneath buildings, motor vehicles, bridges, etc. There were no gaps in the data due to insufficient side overlap or instrument malfunctions.
- measure Description The FR and LR data is is supplied as an ASCII comma delimited file with each point represented with an X, Y and elevation. The data is processed from the last return raw point cloud data. This bare earth (BE) data is consistent with the original data. Data were filtered using automated procedures followed by manual editing to remove points that did not belong to the terrain surface (e.g. water, vegetation, buildings, system (noise)).
Resource distribution information
Distributor
- organisation Name DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
- Contact information
-
- Telephone
-
- Voice 843-740-1200
- Address
-
- 2234 South Hobson Ave., Charleston, SC, 29405-2413
- electronic Mail Address coastal.info@noaa.gov
- Ordering Instructions 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.
Distributor
- individual Name Mike Sutherland
- organisation Name DOC/NOAA/NESDIS/NCEI > National Centers of Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
- Contact information
-
- Telephone
-
- Voice 303-497-6120
- Fax 303-497-6513
- Address
-
- 325 Broadway E/GC1, Boulder, CO, 80305-3328 Country USA
- electronic Mail Address mike.sutherland@noaa.gov
- Ordering Instructions The National Geophysical Data Center serves as the archive for this LIDAR dataset. NGDC should only be contacted for the data if it cannot be obtained from NOAA Coastal Services Center.
- Format name LAZ
- Format version
- date of next update: 2014-01-22
- maintenance or update frequency: annually
- notes: This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2013-01-04 version of the FGDC RSE to ISO 19115-2 for LiDAR transform.
- notes: Translated from FGDC 2013-01-22T13:13:16.932-07:00
- individual Name Mike Sutherland
- organisation Name DOC/NOAA/NESDIS/NCEI > National Centers of Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
- Contact information
-
- Telephone
-
- Voice 303-497-6120
- Fax 303-497-6513
- Address
-
- 325 Broadway E/GC1, Boulder, CO, 80305-3328 Country USA
- electronic Mail Address mike.sutherland@noaa.gov