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Elevation | LiDAR

A coordinated effort with the US Geological Survey

LiDAR Coverage and Download Map

The application linked above allows you to easily tell which LiDAR projects cover Tennessee and provides links to data downloads.

In spring 2021, the USGS and their contractor, Woolpert, completed the 5 year project to collect statewide lidar/digital elevation data for Tennessee.  This effort was due in part to many federal, state, and local government partners in coordination with STS-GIS Services.  From this page, you can access maps of the data collection and links to download the lidar data products, learn more about lidar technology and how it can be applied for your use, and provide feedback to us on how this data is valuable to your organization.

Instructional Videos

For LiDAR training videos for use in Esri and QGIS software, click here.

GIS Data

To access and/or download the LiDAR data for the completed projects, click here.

LiDAR Use Feedback Survey

This survey is to gain information on how Tennessee's organizations are using the LiDAR data. 

The following sections provide detailed information about the project's Business Plan/Tech Specs, a LiDAR FAQ sheet, a LiDAR Inventory Map, Business Plan Events and a LiDAR Resources page.

Business Plan

The first step to accomplish our mission on this project is to create a business plan that identifies the business requirements, costs, and benefits of creating a LiDAR derived elevation GIS dataset. In addition, documenting the appropriate technical specifications, and related processes to the LiDAR data, is a foundational element associated with this project.

Using grant funding from FGDC and the NSGIC "50 States Initiative", STS - GIS Services and Applied Geographics conducted regional GIS coordination meetings and stakeholder interviews to gather detailed business requirements that support the argument of why Tennessee should invest in LiDAR/elevation GIS data products.

Here are the results from these coordination/outreach efforts:

LiDAR FAQ

1. What is LiDAR?

LiDAR is an optical remote sensing technology that measures properties of scattered light to find range and/or other information of a distant target. This technology is used to measure distance and derive highly accurate elevation data.

2. Does Tennessee have existing elevation data?

Yes. Through the original Tennessee Base Mapping Program (2000-2007), STS - GIS Services developed digital terrain models (DTM) primarily for ortho rectification.

3. Why does Tennessee need LiDAR "enhanced" elevation data?

While very useful, the original DTM data doesn't meet the vertical accuracy requirements for all digital elevation needs in the State.

4. What are the differences between the original DTM data and the LiDAR derived "enhanced" elevation data?

The original photogrammetric derived standard DTM data has a vertical accuracy of +/- seven feet; suitable for a 10 foot contour that meets ASPRS class 2 standards. LiDAR derived "enhanced" elevation data can achieve a vertical accuracy of up to +/- 9cm, suitable for a 1 or 2 foot contour that meets ASPRS class 1 standards.

For more FAQ's regarding LiDAR in general, please see the following document developed by USGS as part of a national assessment for enhanced elevation:

Resources

LiDAR, or Light Detection and Ranging, is an evolving technology used to support a wide variety of geospatial business needs at all levels of government and in the private sector.

Instead of defining our own interpretation or understanding of LiDAR, we are providing the following URL's that best describe the technology, resources, associated elevation data products, and how to apply the technology for specific applications.

Contacts

Dennis Pedersen

Director of STS GIS Services
615-741-9356
dennis.pedersen@tn.gov

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