2010 Wayne County, GA LIDAR Survey
This kmz file shows the extent of coverage for the 2010 USGS Wayne County, GA lidar
The purpose of this project is to provide professional surveying and mapping services
for the creation of a high-resolution digital elevation model developed from LIDAR
data for Wayne County, Georgia. USGS Contract G10PC00026, Task Order Number G10PD000654
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
- DOI/USGS > United States Geological Survey, U.S. Department of the Interior
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
||The purpose of this project is to provide professional surveying and mapping services
to collect and deliver topographic elevation data derived from multiple return light
detection and ranging (lidar) measurements for areas in southeast / coastal Georgia.
These data are intended for use in coastal management decision making, including applications
such as sea level rise and coastal flood mapping. Lifts were planned to meet project
specifications and were flown under cloud-free conditions in order to collect LiDAR
points at an average of 1.0 meter point spacing. This allows the user to create Intensity
Images, Break Lines, and fully Classified LiDAR LAS files. Classified LAS files are
used to show the manually reviewed bare earth surface. Any additional classification
include Class 1 - unclassified, Class 2 - ground surface, Class 4 - medium Vegetation,
Class 5 - High Vegetation, Class 7 - low point (noise) and Class 12 - Overlap points.
||2010-03-19 to 2010-03-24
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- Digital terrain model
- remote sensing
- Wayne 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 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. Breaklines were used to reclassify lakes and 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.
- The NOAA Coastal Services Center (CSC) received topographic files in LAS V1.2 format.
The data were referenced horizontally to NAD83, State Plane Coordinate System (Georgia
East; FIPS 1001) and were vertically referenced to NAVD88 using the Geoid09 model.
The horizontal and vertical units of the data were US survey feet. CSC performed the
following processing for data storage and Digital Coast provisioning purposes: 1.
The data were converted from projected coordinates (Georgia State Plane East) to geographic
coordinates (NAD83). 2. The data were converted from orthometric (NAVD88) heights
to ellipsoidal heights (GRS80) using Geoid09. 3. The vertical units were converted
from US survey feet to meters. 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: 2013-10-17
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