Floodplain Mapping Program, North Carolina Division of Emergency Management
20040531
NC Floodplain Mapping: Phase 2; LIDAR Full Return Mass Points, Jan-Mar 2003
v.1
remote-sensing image
LIDAR full return raw data
1
High Point, NC 27265
EarthData International of North Carolina
The data obtained through The Seamless Server is considered to be the "best available" data from USGS. Historical data and other data may be obtained by contacting Customer Services, Center for Earth Resources Observation & Science, at 1-800-252-4547. Information in quotation marks is taken directly from any original documentation available.
http://seamless.usgs.gov
http://lidar.cr.usgs.gov
"Airborne LIDAR terrain mapping data acquired January
through March 2003. Point data (XYZ) in ASCII format.
Horizontal datum NAD83(1995) North Carolina State Plane
feet. Vertical datum NAVD88 US Survey Feet.
These data may represent a single geographic tile of a
larger, county/sub-county data set. As such, the map
extent indicated in the Spatial_Domain element is
representative of the larger data set and not an individual
tile. The data are organized in 10,000 ft x 10,000 ft tiles
using the NC Bureau of Land Records Management
(LRMP) standards. Specific information about individual
data tiles is included in the data delivery index. More
information about this can be obtained at
www.ncfloodmaps.com."
"These data were collected and derived by the North
Carolina Floodplain Mapping Program
(www.ncfloodmaps.com) as part of its effort to modernize
FEMA Flood Insurance Rate Maps (FIRM) statewide.
Although created for specific use in the engineering
aspects of floodplain delineation, the data were also
developed to address the elevation data requirements of
the broader geospatial data user community. The North
Carolina Floodplain Mapping Program was established in
response to the extensive damage caused by Hurricane
Floyd in 1999."
"This data set should be accompanied by both an
associated metadata record and a data delivery index that
includes unique database information for each tile of the
data set."
20030103
20030323
ground condition
Unknown
-76.2500002292797
-76.1875002292215
36.3749997271332
36.312500227075
000000.000000
000000.000000
000000.000000
000000.000000
Keywords
LIDAR
Lidar
Elevation
Full return
Raw
Contour
Shapefile
ESRI
Elevation
Flood
Floodplain
Hydraulic Modeling
ISO 19115 Category
imageryBaseMapsEarthCover
010
geoscientificInformation
008
location
013
American Society of Photogrammetry and Remote Sensing
National Standards for Spatial Digital Accuracy (NSSDA)
U.S. Department of Commerce, 1995, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions, Federal Information Processing Standard 10-4,): Washington, D.C., National Institute of Standards and Technology
United States
U.S.
US
U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard (FIPS) 5-2): Washington, D.C., National Institute of Standards and Technology.
NC
Geographic Names Information System
North Carolina
NC
Catawba River Basin
Chowan River Basin
Roanoke River Basin
Yadkin-Pee Dee River Basin
Alexander County
Alleghany County
Anson County
Ashe County
Avery County
Bertie County
Burke County
Cabarrus County
Caldwell County
Caswell County
Catawba County
Chowan County
Davie County
Forsyth County
Gaston County
Gates County
Granville County
Halifax County
Hertford County
Iredell County
Lincoln County
Martin County
McDowell County
Mecklenburg County
Montgomery County
Northampton County
Person County
Randolph County
Richmond County
Rockingham County
Rowan County
Stanly County
Stokes County
Surry County
Union County
Vance County
Warren County
Watauga County
Wilkes County
Yadkin County
Piedmont
None
"This data was created with the highest consideration of accuracy and data integrity. However, as with all other geospatial datasets, users must take into consideration the consequences of using the data for specific applications, business processes, decisions, and map display. For example, surface conditions may have changed in some areas since the initial data was captured. A full metadata record is provided to help the user understand the date, map scale and accuracy standard applied in the collection and data development process. The data should not be used without full review and comprehension of the metadata. Acknowledgement of the North Carolina Floodplain Mapping Program is appreciated when using the data set. Data further derived from this data set should be fully documented using the federal metadata standard and listed via the NC Geospatial Data Clearinghouse." There is no guarantee of warranty concerning the accuracy of the data. Users should be aware that temporal changes may have occurred since this data set was collected and that 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. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer.
Jason Stoker
USGS / EROS
Senior Scientist
mailing and physical address
USGS Center for Earth Resources Observation & Science
47914 252nd Street
Sioux Falls
SD
57198-0001
USA
605-594-2579
jstoker@usgs.gov
This data set was developed for the North Carolina Floodplain Mapping Program by EarthData International of North Carolina. Parts of the raw data acquisition were subcontracted to Horizons Inc. and 3001 Inc.
None
Unclassified
N/A
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722
"LIDAR full returns were compared with NCGS QA/QC
checkpoints using only single and final returns per pulse.
A vertical bias was aquired after airport calibration based
on this comparison.
For the NC Floodplain Mapping Program, the vertical
accuracy for coastal counties is less than or equal to 20 cm
RMSE. For mainland counties, the vertical accuracy of the
elevation data is less than or equal to 25 cm RMSE.
More information about the Quality Control reports and a
summary of the quality control checks for each county in
the project can be found at
www.ncgs.state.nc.us/flood/qc_reports/qc_status.htm."
20
"<=20 RMSE (cm) of bare earth LIDAR points compared with independent checkpoints."
"Data was vertically adjusted based on RMSE and mean difference from control report."
"The full return mass points contain voids where insufficient
energy was reflected from the surface to generate a
valid return from the terrain. Voids in the full return mass points
tend to occur in water bodies. Wet sand and certain types of
vegetation can also cause voids or anomalous elevations."
"LIDAR full return mass points were compared with surveyed
elevations provided by independent contractors to the
NCGS.
More information about the Quality Control reports is
available at
www.ncgs.state.nc.us/flood/qc_reports/qc_status.htm.
Numerous internal quality assurance/quality control steps
taken to ensure the quality of the LIDAR terrain data to
meet the bare earth requirements and RMSE accuracy
standards in the NC Floodplain Mapping Program.
Step 1. Preprocessing
Step 2. Post-Automated Editing QC (Data Evaluation)
Step 3. QC Check of Tiles
Step 4. Manual Editing (Hillshade Checks / Peer Review)
Step 5. QC and Tile Edge Matching
Step 6. Final EarthData QC
Step 7. Comparisons of Independent Field Survey Data
with LIDAR Data"
2
"RMSE (m) of bare earth LIDAR points compared with independent checkpoints."
"LIDAR full return mass points were compared with surveyed
elevations provided by independent contractors to the
NCGS. A vertical bias was aquired after airport calibration based
on this comparison.
For the NC Floodplain Mapping Program, the vertical
accuracy for coastal counties is less than or equal to 20 cm
RMSE. For mainland counties, the vertical accuracy of the
elevation data is less than or equal to 25 cm RMSE.
More information about the Quality Control reports and a
summary of the quality control checks for each county in
the Tar-Pamlico Basin can be found at
www.ncgs.state.nc.us/flood/qc_reports/qc_status.htm.
Numerous internal quality assurance/quality control steps
were taken to ensure the quality of the LIDAR terrain data
to meet the bare earth requirements and RMSE accuracy
standards in the NC Floodplain Mapping Program.
Step 1. Preprocessing
Step 2. Post-Automated Editing QC (Data Evaluation)
Step 3. QC Check of Tiles
Step 4. Manual Editing (Hillshade Checks / Peer Review)
Step 5. QC and Tile Edge Matching
Step 6. Final EarthData QC
Step 7. Comparisons of Independent Field Survey Data
with LIDAR Data"
20
"RMSE (cm) of bare earth LIDAR points compared with independent checkpoints."
"All data collection flights were initialized and finalized
during periods of GPS Position Dilution of Precision greater
than 4. GPS data quality was evaluated post-flight to
ensure sufficient quality for LIDAR data requirements and
integration. GPS base maximum allowable distance
between stations was established such that no more than a
50 mile radius occurred between occupations. Swath width
of terrain covered in a single flightline for inland areas at an
altitude of 12,000 feet AMT was approximately 3,411
meters, coastal areas at an altitude of 8,000 feet AMT was
approximately 2,274 meters. Field of View for the Leica
GeoSystems Aeroscan system used was 50 degrees project
wide, or 25 degrees from nadir with a maximum of 5 returns
collected for each pulse. Ground distance between
flightlines for inland areas at 12,000 feet AMT was
approximately 2,388 meters, for coastal areas at 8,000 feet
AMT was approximately 1,592 meters. Nominal post
spacing for finalized Bare Earth product was 3 meters. An
average of 10-20 rapid static GPS survey collected ground
control points were established per base airport project wide
to detect and correct horizontal and vertical bias. Typically,
3 or more flightlines of LIDAR returns were collected for
each airport lift, one of which being bi-directional for use in
optimizing instrument boresight angles to account for aircraft
pitch, yaw and roll. All post process collection quality
assurance is achieved aided by airport cross and
bi-directional flightlines, entire lift cross flightlines, and the
use of surveyed ground control points."
20030200
EarthData International of North Carolina
Harold Rempel
LIDAR Production Manager
mailing and physical address
1912 Eastchester Drive
Suite 111
High Point
NC
27265
USA
(336) 812-9121
hrempel@earthdata.com
"Checking for coverage and anomalies
Airport calibration
Production flightline calibration
Removal of blunders"
20030200
EarthData International of North Carolina
Harold Rempel
LIDAR Production Manager
mailing and physical address
1912 Eastchester Drive
Suite 111
High Point
NC
27265
USA
(336) 812-9121
hrempel@earthdata.com
"Tiling
Automated filtering for point classification
Manual editing to classify points
Quality control
Removal of all points not classified as bare earth"
Unknown
EarthData International of North Carolina
Harold Rempel
LIDAR Production Manager
mailing and physical address
1912 Eastchester Drive
Suite 111
High Point
NC
27265
USA
(336) 812-9121
hrempel@earthdata.com
"The methods used to develop these data for the North
Carolina Floodplain Mapping Program are documented in
LIDAR Bare Earth Mass Points and Breaklines Technical
Document, available online at
www.ncfloodmaps.com."
Unknown
EarthData International of North Carolina
Harold Rempel
LIDAR Production Manager
mailing and physical address
1912 Eastchester Drive
Suite 111
High Point
NC
27265
(336) 812-9121
hrempel@earthdata.com
The metadata were imported and updated for display through the Seamless Data Distribution System at <http://seamless.usgs.gov>
200708
U.S. Geological Survey
Customer Service Representative
mailing and physical address
USGS Center for Earth Resources Observation & Science
47914 252nd Street
Sioux Falls
SD
57198-0001
USA
605-594-6151
1-800-252-4547
605-594-6933
605-594-6589
custserv@usgs.gov
0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
Point
State Plane Coordinate System 1983
3200
34.333333
36.166667
-079.000000
+33.750000
2000000.002617
0.000000
coordinate pair
0.01
0.01
survey feet
North American Vertical Datum of 1988
0.01
US Survey Feet
Explicit elevation coordinate included with horizontal coordinates
"Bare earth LIDAR returns contain values referencing spatial
locations horizontal and vertical. Horizontal X and Y values
are represented in North Carolina State Plane feet,
NAD83(1995). Vertical Z values are referenced in
NAVD88, US Survey Feet and represent value above
mean sea level.
The data set includes a single elevation value for each
bare earth surface point. Elevation is expressed as 0.001
US Survey Feet above mean sea level."
"LIDAR Bare Earth Mass Points and Breaklines Technical"
U.S. Geological Survey
Customer Services Representative
mailing and physical address
USGS Center for Earth Resources Observation & Science
47914 252nd Street
Sioux Falls
SD
57198-0001
USA
605/594-6151
1-800-252-4547
605/594-6933
605/594-6589
custserv@usgs.gov
0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
The USGS "Distribution" point of contact is for questions relating only to the data display and download from this web site. For questions regarding data content and quality, please contact:
Mr. Jason Stoker
Senior Scientist
USGS Center for Earth Resources Observation & Science
phone: 605-594-2579
email: jstoker@usgs.gov
Downloadable Data
Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty. Data may have been compiled from various outside sources. Spatial information may not meet National Map Accuracy Standards. This information may be updated without notification. The USGS shall not be liable for any activity involving these data, installation, fitness of the data for a particular purpose, its use, or analyses results.
Arc/Info Export Format and/or ArcView Shapefile
ArcGIS 9.1
ASCII
0.001
http://seamless.usgs.gov
The URL <http://seamless.usgs.gov> provides a map interface that allows for data downloads within a customer defined area of interest. Zoom tools are available that can be used to investigate areas of interest on the map interface. The download tool allows the customer to capture layers from the map, utilizing the Seamless Data Distribution System process for downloading. A request summary page is then generated with the download layers listed. By clicking the "download" button on the summary page, a zipped file will be generated that can be saved on the customer's computer. The file can then be unzipped and imported into various user software applications.
Not available for dissemination
None
Variable
ESRI ArcGIS Suite and/or Arc/Info or other compatible software, and supporting operating systems.
2007
unknown
20070829
U.S. Geological Survey
Customer Services Representative
mailing and physical address
USGS Center for Earth Resources Observation & Science
47914 252nd Street
Sioux Falls
SD
57198-0001
USA
605/594-6151
1-800-252-4547
605/594-6933
605/594-6589
custserv@usgs.gov
0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
The above is the contact information for the USGS Center for Earth Resources Observation and Science in Sioux Falls, SD. This is the digital data storage and distribution center for the USGS. Metadata information can also be obtained through online services using The National Map Viewer, at http://nationalmap.usgs.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
None
None
None
Unclassified
None
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile