2007 Federal Emergency Management Agency (FEMA) Niagara County New York Lidar
The spring 2007 LiDAR Flight Acquisition required the collection of approximately
526 square miles of Niagara County and approximately 30 square miles of the corridors
of Erie County. Total, approximately 555 square miles were collected at a nominal
point spacing of 1.4 meters and based on the Sanborn FEMA compliant LiDAR product
specification. The lidar data was collected from Jan 3 2007-May 9 2007. Multiple returns
were recorded for each laser pulse along with an intensity value for each return.
The lidar points in this data set are the last return data, it is not a bare earth
data set and the points have not been classified. LIDAR data is remotely sensed high-resolution
elevation data collected by an airborne collection platform. Using a combination of
laser range finding, GPS positioning and inertial measurement technologies; LIDAR
instruments are able to make highly detailed Digital Elevation Models (DEM) of the
earth's terrain, man-made structures and vegetation. This data was collected at a
resolution to aid in coastal management decisions including flood plain analysis and
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
||Federal Emergency Management Agency, Region II
- DHS/FEMA > Federal Emergency Management Agency, U.S. Department of Homeland Security
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
||Reflective surface data represents the DEM created by laser energy reflected from
the first surface encountered by the laser pulse. Some energy may continue beyond
this initial surface to be reflected by a subsequent surface as represented by the
Last Return data. Intensity information is captured from the Reflective Surface pulse
and indicates the relative energy returned to the sensor as compared to the energy
transmitted. The Intensity image is not calibrated or normalized but indicates differences
in energy absorption due to the interaction of the surface materials with laser energy
at the wavelength transmitted by the sensor.
||LIDAR data is used for 3D visualization, elevation based analysis and for feature
||2007-01-03 to 2007-05-09
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- Digital Elevation Model
- Surface Model
- United States
- New York
- Niagara County
- Lake Ontario
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
- DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
| Processing Steps
- 1. Fly lidar with Optech 2050 at nominal 1.4 m point spacing. 2. Process Airborne
GPS using the GrafNAV V7.50 software by Waypoint Consulting of Calgary, Alberta, Canada.
3. Process IMU data using the PosPac V4.2 software by Applanix Corporation of Richmond
Hill, Ontario, Canada. 4. Reflective Surface Generation using the ASL Post Processor
software by Leica Geosystems software of Terrasolid Limited of Helsinki, Finland.
- The NOAA Coastal Services Center (CSC) received the files in ASCII format. The files
contained Lidar elevation and intensity measurements. The data were in State Plane
New York West, FIPS 3103 coordinates, horizontal units of measure of US survey feet
and in NAVD88 Geoid 03 vertical datum with vertical units of measure of feet. CSC
performed the following processing to the data to make it available within the Digital
Coast: 1. The data were converted from NY State Plane coordinates to geographic coordinates.
2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid)
heights using Geoid 03. 3. The LAS data were sorted by latitude and the headers were
updated. 4. The data were filtered to remove outliers.
- The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp
transfer from the NOAA Coastal Services Center. The data are
currently being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/.
The data can be used to re-populate the system. The data are archived in LAS
or LAZ format. The LAS format is an industry standard for LiDAR data developed by
the American Society of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless
compressed version of LAS developed by Martin Isenburg (http://www.laszip.org/). The
data are exclusively in geographic coordinates (either NAD83 or ITRF94). The data
are referenced vertically to the ellipsoid (either GRS80 or ITRF94), allowing for
the ability to apply the most up to date geoid model when transforming to orthometric
Metadata Last Modified: 2013-06-07
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