2010 U.S. Geological Survey Topographic LiDAR: Atchafalaya Basin, Louisiana
This kmz file shows the extent of coverage for the 2010 USGS Atchafalaya Basin, Louisiana
lidar data set.
The Light Detection and Ranging (LiDAR) dataset is a survey of the Atchafalaya Basin
in south-central Louisiana. The entire survey area encompasses 981 square miles. The
LiDAR point cloud was flown at a nominal post spacing of 1.0 meters for unobscured
areas. The LiDAR data is in compliance with the U.S. Geological Survey National Geospatial
Program Guidelines and Base Specifications, Version 13-ILMF 2010. The Flightlines
were acquired by Northrop Grumman, 3001 Operating Unit, which required 10 subsequent
missions between December 2, 2010, and December 7, 2010. Northrop Grumman classified
the data into the following ASPRS compliant classes: Class 1: Processed, but unclassified
Class 2: Bare Earth Ground Class 3: Low Vegetation Class 4: Medium Vegetation (also
used for manual classification of vegetation returns) Class 5: High Vegetation Class
6: Buildings and man-made structures Class 7: Noise (low or high, manually identified)
Class 9: Water Class 10: Ignored Ground (Breakline Proximity) Class 13: Withheld (outliers,
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
United States Geological Survey, National Geospatial Technical Operations Center (NGTOC)
Lidar Dataset Supplemental Information
- DOI/USGS, United States Geological Survey, U.S. Department of the Interior
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||This regional LiDAR elevation mapping will be used for modeling, predicting landscape
change, promoting restoration of ecosystems, and mitigating risks associated with
anthropomorphic and natural hazards.
||2010-12-02 to 2010-12-07
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- United States
- Atchafalaya Basin
- Iberville Parish
- St. Martin Parish
- St. Mary Parish
- Assumption Parish
- Iberia Parish
- St. Landry Parish
- Pointe Coupee Parish
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
- Northrop Grumman, 3001 Operating Unit
| Processing Steps
- The ABGPS, inertial measurement unit (IMU), and raw scans are collected during the
LiDAR aerial survey. The ABGPS monitors the xyz position of the sensor and the IMU
monitors the orientation. During the aerial survey, laser pulses reflected from features
on the ground surface are detected by the receiver optics and collected by the data
logger. GPS locations are based on data collected by receivers on the aircraft and
base stations on the ground. The ground base stations are placed no more than 40 km
radius from the flight survey area.
- The ABGPS, IMU, and raw scans are integrated using proprietary software developed
by Optech and delivered with the Optech ALTM 213 System. The resultant file is in
a LAS binary file format. The LAS version 1.2 file format 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 number, intensity value, xyz, etc.). The resultant
points are produced in the NAD83 UTM Zone 15 coordinate system, with units in meters
and referenced to the NAVD88 datum. The LiDAR mass points were processed in American
Society for Photogrammetry and Remote Sensing LAS 1.2 format. The header file for
each dataset is complete as defined by the LAS 1.2 specification. The datasets were
divided into a 1500 meters by 1500 meters tiling scheme. The tiles are contiguous,
do not overlap, and are suitable for seamless topographic data mosaics that include
no "no data" areas. The names of the tiles include alphabetic column and numeric row
designations and all files utilize the LAS file extension.
- The unedited data are classified to facilitate the application of the appropriate
feature extraction filters. A combination of proprietary filters are applied as appropriate
for the production of bare earth models (DEMs). 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 NOAA Coastal Services Center (CSC) received topographic files in LAS format. The
files contained lidar elevation and intensity measurements. The data were received
in NAD83 UTM Zone 15 Coordinates and were vertically referenced to NAVD88 using the
Geoid09 model. The vertical units of the data were meters. CSC performed the following
processing for data storage and Digital Coast provisioning purposes: 1. The topographic
las files were converted from orthometric (NAVD88) heights to ellipsoidal heights
using Geoid09. 2. The topographic las files were converted from UTM Zone 15 (meters)
to Geographic coordinates (decimal degrees). 3. ASPRS Class 11 (Withheld) was changed
to Class 13 (Withheld). 4. 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: 2013-04-25
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