2011 U.S. Geological Survey (USGS) Topographic LiDAR: Louisiana Region 1
This kmz file shows the extent of coverage for the 2011 ARRA USGS Lousiana Region 1 lidar data set.
TASK NAME: Louisiana Region 1 LiDAR ARRA Task Order LiDAR Data Acquisition and Processing Production Task- Vermillion, Iberia, St. Mary, Terrebonne, and Lafourche Parishes USGS Contract No: G10PC00057 Task Order No: G10PD02781 Woolpert ORDER NUMBER: 70930 CONTRACTOR: Woolpert, Inc. LiDAR data is a remotely sensed high resolution elevation data collected by an airborne platform. The LiDAR sensor uses a combination of laser range finding, GPS positioning, and inertial measurement technologies. The LiDAR systems collect data point clouds that are used to produce highly detailed Digital Elevation Models (DEMs) of the earth's terrain, man-made structures, and vegetation. The task required the LiDAR data to be collected at a nominal pulse spacing (NPS) of 2.0 meters. The final products include first, last, and at least one intermediate return LAS, full classified LAS and a bare earth model in separate files.
|Other Access||Online access information not available.|
|Distributor||DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National
Oceanic and Atmospheric Administration, U.S. Department of Commerce
|Dataset Point of Contact||USGS NGTOC
USGS (United States Geological Survey)
Documentation links not available.
|Data Presentation Form:|| Digital image
|Dataset Progress Status||Complete|
|Data Update Frequency:||As needed|
The reflective surface data represents the DEM created by the 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. The bare earth model is created by identifying the returns that fall on the ground surface and by interpolating a surface between these points. In this manner, buildings and vegetation are removed from the bare earth model. This data set does not include bridges and overpasses in the bare earth model as the delineation point for these structures is not reliably discernible in the LiDAR data.
|Purpose:||This task order consisted of LiDAR data acquisition and processing for Vermillion, Iberia, St. Mary, Terrebonne, and Lafourche Parishes in southeastern Louisiana. The task order area of interest encompasses approximately 6,684,759,312 square meters (2,581 square miles). The task required the LiDAR data to be collected at a nominal pulse spacing (NPS) of 2.0 meters. The LiDAR data was collected to meet a vertical accuracy requirement of 12.5 cm (0.41 ft) RMSE, or better. The final LiDAR data was delivered as 1,500m x 1,500m tiles, aligned to even 1,500m coordinates.|
|Time Period:||2011-01-22 to 2011-04-12|
|Spatial Reference System:||urn:ogc:def:crs:EPSG::4269|
|Spatial Bounding Box Coordinates:||
|Spatial Coverage Map:|
|Use Constraints||No constraint information available|
|Fees||Fee information not available.|
Last Modified: 2013-01-22
For questions about the information on this page, please email: email@example.com