Topographic Contours 2024 - Download

This downloadable zip file contains an ESRI File Geodatabase (FGDB) that is compatible with most versions of ArcGIS Pro, ArcMap, and AutoCAD Map 3D or Civil 3D. To view the geodatabase’s contents, please download the zip file to a local directory and extract its contents. This zipped geodatabase will require approximately 1.38 GB of disc space (1.49 GB extracted). Due to its size, the zip file may take some time to download. This downloadable file geodataase (FGDB) includes Topographic Countours and Spot Elevations derived from LiDAR collected in spring of 2024 by Dewberry Engineers in coordination with Tallahassee - Leon County GIS. The contours were extracted at a 2 foot interval with index contours every 10 feet. Lidar Acquisition Executive Summary The primary purpose of this project was to develop a consistent and accurate surface elevation dataset derived from high-accuracy Light Detection and Ranging (lidar) technology for the Tallahassee Leon County Project Area. The lidar data were processed and classified according to project specifications. Detailed breaklines and bare-earth Digital Elevation Models (DEMs) were produced for the project area. Data was formatted according to tiles with each tile covering an area of 5000 ft by 5000 ft. A total of 876 tiles were produced for the project encompassing an area of approximately 785.55 sq. miles. The dataset was created by TLCGIS from lidar data acquired by a Riegl CQ-1560i lidar system from January 14, 2024 through January 19, 2024. ORIGINAL COORDINATE REFERENCE SYSTEM Data produced for the project were delivered in the following reference system. Horizontal Datum: The horizontal datum for the project is North American Datum of 1983 with the 2011 Adjustment (NAD 83 (2011)) Vertical Datum: The Vertical datum for the project is North American Vertical Datum of 1988 (NAVD88) Coordinate System: NAD83 (2011) State Plane Florida North (US survey feet) Units: Horizontal units are in U.S. Survey Feet, Vertical units are in U.S. Survey Feet. Geiod Model: Geoid12B (Geoid 12B) was used to convert ellipsoid heights to orthometric heights).