Florida Department of Emergency Management 2007 Southwest Florida DEM

This Digital Elevation Model (DEM) was derived from the (2007) lidar and terrain data collected by the Florida Department of Emergency Management (FDEM). The existing LiDAR and terrain data was processed by Woolpert, Inc. to a DEM at a five foot spacing, tiled, and numbered into 5000' x 5000' tiles according to the Florida Statewide (2007) tiling scheme for the Southwest Florida Water Management District's Topographic Information and Publication System (TIPS) project in 2008. This metadata record covers an aggregate of collections in 2007 in Southwest Florida to facilitate distribution through the NOAA Digital Coast.

Original contact information:

Contact Name: Mapping and GIS Section

Contact Org: Southwest Florida Water Management District

Phone: (352) 796-7211

This Digital Elevation Model (DEM) was constructed for the explicit purpose of water modeling within watersheds. The data is designed to meet or exceed the National Spatial Standards for Digital Data (NSSDA) as specified in the survey reports that accompany the original project data.

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This DEM tile may represent an entire (5000' x 5000') tile within the Florida Statewide Grid or it may contain a portion thereof. Polygon indexes do not differentiate partial tiles.

Translation of files to formats other than those described here is the sole responsibility of individuals downloading the data.

This data can be obtained on-line at the following URL:

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=6252.

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The original terrain data used in the construction of this DEM were collected and processed under the supervision of a licensed Professional Surveyor and Mapper. However, the derived DEM product for this project is not certified to that same extent. Use of these data requires a general understanding of GIS and measurements of spatial accuracy.

Refer to the MTS Report of Specific Survey for the original project data set. There are no Attributes in this data set.

Refer to the MTS Report of Specific Survey for the original project data set.

Refer to the MTS Report of Specific Survey for the original project data set.

Cloud Cover: 0

This DEM is complete as represented in the particular tile.

The LiDAR data was acquired using a Leica ALS50 from an average altitude of 3,000-feet above ground level to provide an average ground sample distance of 2.1-feet. First and last return data was collected along with the signal return intensity. Two redundant airborne GPS bases stations were utilized during the data acquisition with maximum line-of-sight distance between the base station and aircraft of 20-km. The LiDAR data was reduced using Grafnav (Waypoint Consulting) for GPS post-processing, PosProc (Applanix Crop) for IMU processing, ALS50 Post Processor (LH Systems) to initial LiDAR processing, TerraScan (Terrasolid) for initial point classification, and proprietary Woolpert developed software for refining the point classification and QC. The LiDAR data was reviewed in 3D using a digital photogrammetric workstation using ADS40 digital stereo imagery. 3D breaklines were collected at the digital photogrammetric workstation during the LiDAR data review. These breaklines were delineated to insure the DTM is hydrologically correct. The original LiDAR data was developed in accordance with the Federal Emergency Management Agency's (FEMA) Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix A: Guidance for Aerial Mapping and Surveying, April 2003.