2007 Lidar DEM: Jasper, Colleton, Charleston Counties, SC

Digital Elevation Model (DEM) derived from lidar data.

LiDAR data collection was performed utilizing a Leica ALS-50 sensor, collecting multiple return x, y, and z data as well

as intensity data. LiDAR data was processed to achieve a bare ground surface, and was delivered in LAS format. Classified LAS

data was also used as a base for collection of hydro features, delivered in MicroStation v8 format. The dates of collection are:

1. JASPER COUNTY (full county): 20061227 to 20070216

2. COLLETON COUNTY (full county: 20070216 to 20070323

3. CHARLESTON COUNTY (Partial County): 20070222 to 20070223

Lidar data was acquired for Charleston (Partial County), Jasper (full county) and Colleton (full county) Counties, SC as part of a collaborative effort by state agencies, FEMA and the NOAA Office for Coastal Management to provide high-resolution topographic data for floodplain mapping and other uses.

The Lidar Quality Assurance and Quality Control Report for Colleton and Charleston Counties, SC may be viewed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12a/56/supplemental

The Lidar Quality Assurance and Quality Control Report for Jasper County, SC may be viewed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12a/56/supplemental/index.html

Any conclusions drawn for the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners.

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer.

The data set is dynamially generated based on user-specified parameters.

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Users should be aware that temporal changes may have occurred since this data set was collected and some parts of

this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a

full awareness of its limitations.

JASPER COUNTY: Horizontal accuracy is 1 m based on collection specifications.

COLLETON COUNTY: Horizontal accuracy is 1 m based on collection specifications.

CHARLESTON COUNTY: Horizontal accuracy is 1 m based on collections specifications.

JASPER COUNTY: Based on a control-to-LiDAR comparison, LiDAR data delivered for this project returned an RMSE of 0.06 m and an Accuracy of 0.12 m in open terrain, based on 42 points. Combined Vertical Accuracy (CVA) is 0.30 m based on 108 points.

COLLETON COUNTY: Based on a control-to-LiDAR comparison, LiDAR data delivered for this project returned an RMSE of 0.068 m and an Accuracy of 0.13 m in open terrain, based on 21 points. Combined Vertical Accuracy (CVA) is 0.22 m based on 91 points.

CHARLESTON COUNTY: Based on a control-to-LiDAR comparison, LiDAR data delivered for this project returned an RMSE of 0.092 m and an Accuracy of 0.18 m at the 95% confidence level in open terrain, based on 26 points. Combined Vertical Accuracy (CVA) is 0.183 m at the 95% confidence level, based on 75 points.

All project tasks have been completed. No known data gaps exist (with the exception of water areas) within the

project area.

Elevation and hydrography data was delivered covering the full extent of Jasper and Colleton Counties, and partial county coverage of Charleston County.