2009-2010 USACE Vicksburg District Lidar: Mississippi River Delta Phase I
This kmz file shows the extent of coverage for the 2009-2010 USACE Vicksburg District
Mississippi River Delta (Phase I) lidar data set.
LiDAR collected at 1.0 points per square meter (1.0m GSD) for the entire portion of
the Mississippi River Delta in the Vicksburg District. This area was flown during
snow free and leaf-off conditions.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
||Elijah C. Hunt
U.S. Army Corps of Engineers, Vicksburg District
Documentation links not available.
- United State Army Corps of Engineers (USACE) Vicksburg District
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
||Classified LAS files are used to show the manually reviewed bare earth surface. Any
additional classification is provided via automated macro functionality from proprietary
Photo Science TerraScan macros. These additional classifications include Class 4 -
Medium Vegetation and Class 5 - High Vegeation. This allows the user to create Intensity
Images, Break Lines, Raster DEM, and Triangular Irregular Networks.
||2009-02-19 to 2010-08-02
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- Light Detection and Ranging
- Remote Sensing
- Warren County
- Issaquena County
- Yazoo County
- Sharkey County
- Holmes County
- Humphreys County
- Washington County
- Sunflower County
- Leflore County
- Carroll County
- Bolivar County
- Grenada County
- Tallahatchie County
- Yalobusha County
- Coahoma County
- Quitman County
- Panola County
- Tunica County
- Tate County
- DeSoto County
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
| Processing Steps
- Applanix software was used in the post processing of the airborne GPS and inertial
data that is critical to the positioning and orientation of the sensor during all
flights. POSPac MMS provides the smoothed best estimate of trajectory (SBET) that
is necessary for Optech's post processor to develop the point cloud from the LiDAR
missions. The point cloud is the mathematical three dimensional collection of all
returns from all laser pulses as determined from the aerial mission. At this point
this data is ready for analysis, classification, and filtering to generate a bare
earth surface model in which the above ground features are removed from the data set.
The point cloud was manipulated within the Optech or Leica software; GeoCue, TerraScan,
and TerraModeler software was used for the automated data classification, manual cleanup,
and bare earth generation from this data. Project specific macros were used to classify
the ground and to remove the side overlap between parallel flight lines. All data
was manually reviewed and any remaining artifacts removed using functionality provided
by TerraScan and TerraModeler. Class 2 LIDAR was used to create a bare earth surface
model. The surface model was then used to heads-up digitize 2D breaklines of inland
streams and rivers with a 30 foot nominal width and Inland Ponds and Lakes of 0.25
acres or greater. Elevation values were assigned to all Inland Ponds and Lakes using
TerraModeler functionality. Elevation values were assigned to all Inland streams and
rivers using Photo Science proprietary software. All Class 2 LIDAR data inside of
the collected breaklines were then classified to Class 9 using TerraScan macro functionality.
The breakline files were then translated to ESRI Shapefile and ARC Generate format
using ESRI conversion tools. Breaklines were used to reclassify lakes, ponds, and
inland drains. Data was then run through additional macros to ensure deliverable classification
levels matching LAS ASPRS Classification structure. GeoCue functionality was then
used to ensure correct LAS Version. In house software was used as a final QA/QC check
to provide LAS Analysis of the delivered tiles. Buffered LAS files were created in
GeoCue to provide overedge to the DEM creation. These tiles were then run through
automated scripting within ArcMap and were combined with the Hydro Flattened Breaklines
to create the 5' DEM. Final DEM tiles were clipped to the tile boundary in order to
provide a seamless dataset. A manual QA review of the tiles was completed in ArcMap
to ensure full coverage with no gaps or slivers within the project area.
- The NOAA Coastal Services Center (CSC) received the files in laz format. The files
contained LiDAR elevation and intensity measurements. The data were in Mississippi
State Plane West (2301, feet) coordinates and NAVD88 (Geoid03) vertical datum (feet).
CSC performed the following processing for data storage and Digital Coast provisioning
purposes: 1. The data were converted from State Plane (2301) coordinates to geographic
coordinates. 2. The data were converted from NAVD88 (orthometric) heights to GRS80
(ellipsoid) heights using Geoid03. 3. The data were cleaned of bad elevations above
150 m and below 0 m, assumed to be errors points/noise. 4. The data were sorted by
- 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: 2013-12-06
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