2009 Federal Emergency Management Agency (FEMA) Topographic LiDAR: Fort Kent, Maine
This kmz file shows the extent of coverage for the 2009 FEMA Fort Kent, ME lidar data
Camp Dresser McKee Inc. contracted with Sanborn Map Company to provide LiDAR mapping
services for Fort Kent, Maine. Utilizing multi-return systems, Light Detection and
Ranging (LiDAR) data in the form of 3-dimensional positions of a dense set of mass
points was collected in spring 2009 for 187 square miles along the St. Johns River
and the Fish River. The Leica ALS-50 LiDAR system was used to collect data for the
survey campaign. The nominal point spacing of this data set is 1.4 meters. Leica ALS-50
LiDAR System Acquisition Parameters: Average Altitude: 1400 Meters above ground level
Airspeed: ~120 Knots Scan Frequency: 36 Hertz Scan Width Half Angle: 20 Degrees Pulse
Rate: 76,200 Hertz
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
||Federal Emergency Management Agency, Region I
Documentation links not available.
- DHS/FEMA > Federal Emergency Management Agency, U.S. Department of Homeland Security
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||LiDAR points used in conjunction with LiDAR derived breaklines to determine a DTM
|| Unknown to Unknown
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- Land Surface
- Digital Elevation Model
- Digital Surface Model
- Digital Terrain Model
- United States
- Aroostook County
- Fort Kent
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
| Processing Steps
- The ABGPS, IMU, and raw Leica ALS-50 LiDAR data are integrated into the LEICA ALS
post processor software. The resultant file is in a LAS binary file format. The LAS
file version 1.1 formats can be easily transferred from one file format to another.
It is a binary file format that maintains information specific to the LiDAR data (return#,
intensity value, xyz, etc.). The resultant points are produced in the geodetic coordinates
referenced to the NAD83 horizontal datum and GRS80 vertical datum.
- The unedited data are classified to facilitate the application of the appropriate
feature extraction filters. A combination of proprietary filters is applied as appropriate
for the production of bare earth digital terrain models (dtms). Interactive editing
methods are applied to those areas where it is inappropriate or impossible to use
the feature extraction filters, based upon the design criteria and/or limitations
of the relevant filters. These same feature extraction filters are used to produce
elevation height surfaces. The LiDAR mass points were delivered in American Society
for Photogrammetry and Remote Sensing LAS 1.1 format. The header file for each dataset
is complete as define by the LAS 1.1 specification. The data was classified as follows:
Class 1 = Unclassified. This class includes vegetation, buildings, noise etc. Class
2 = Ground.
- Conversion from Geodetic coordinates wgs84 into Maine State Plane East coordinates
using NAD83 and conversion from ellipsoid heights (meters) into orthometric heights
(U.S. Survey Feet).
- The NOAA Coastal Services Center (CSC) received the topographic files in .las.gz compressed
format. The files were LAS version 1.1. The files contained lidar elevation measurements.
The data were received in NAD83 Maine State Plane 2000 East coordinates coordinates
and were vertically referenced to NAVD88 using the Geoid03 model. The vertical units
of the data were feet. CSC performed the following processing for data storage and
Digital Coast provisioning purposes: 1. The compressed .las.gz files were uncompressed
to LASV1.1 format. 2. The topographic las files were converted from a Projected Coordinate
System (Maine SP 2000 East) to a Geographic Coordinate system (GCS). 3. The topographic
las files' horizontal units were converted from feet to decimal degrees. 4. The topographic
las files were converted from orthometric (NAVD88) heights to ellipsoidal heights
using Geoid03. 5. The topographic las files' vertical units were converted from feet
to meters. 6. The data were converted to LAZ format.
- 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
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
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
the ellipsoid (either GRS80 or ITRF94), allowing for the ability to apply the most
up to date geoid model when transforming to orthometric heights.
Metadata Last Modified: 2013-05-17
For questions about the information on this page, please email: