WSCO_CHAT_WSWP Metadata_ChathamCounty_ElevationContourLines_20230522

METADATA: CHATHAM COUNTY, NC CONTOUR LINES — 2ft spacing
This document describes the contour elevation data that is present in the basemaps of
Chatham County GIS Web applications and on their Open Data Hub Site.
Summary
Isolines of estimated elevation values at 2-foot interval spacing. Elevation estimated from 2015 "QL2" lidar
data provided by the North Carolina Floodplain Mapping Program.
Description
This feature class contains line features representing two -foot changes in elevation throughout Chatham
County, NC. It is sourced from Quality Level 2 lidar data provided by the North Carolina Department of
Public Safety Floodplain Mapping Program. LASD datasets were created referencing the tiled lidar data.
Subsets were built using classified ground and water returns. Raster Digital Elevation Models (DEMs) were
built by binning the points and averaging elevation values within 15 m x 15 m cells. The resulting DEMs
were mosaicked to a contiguous ground elevation raster covering the entire county. Areas without ground
point coverage that are covered by water bodies were patched by using DEMs derived from binned water
elevation values. Contour lines were derived from the contiguous, patched DEM at various contour
intervals.
Credits
North Carolina Floodplain Mapping Program, Chatham County, Chatham County GIS
Use limitations
Chatham County GIS shall not be held liable for any errors in these data. This includes errors of omission,
commission, errors concerning the content of the data, and relative and positional accuracy of the data.
These data cannot be construed to be a legal document. Primary sources from which these data were
compiled must be consulted for verification of information contained in these data. Any resale of this data
is strictly prohibited in accordance with North Carolina General Statute 132-10.